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qemu/tcg/optimize.c
Richard Henderson e58b977238 tcg/optimize: Optimize bitsel_vec 
Fold matching true/false operands.
Fold true/false operands with 0/-1 to simpler logicals.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2024-09-22 06:54:49 +02:00

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/*
* Optimizations for Tiny Code Generator for QEMU
*
* Copyright (c) 2010 Samsung Electronics.
* Contributed by Kirill Batuzov <batuzovk@ispras.ru>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qemu/int128.h"
#include "qemu/interval-tree.h"
#include "tcg/tcg-op-common.h"
#include "tcg-internal.h"
#define CASE_OP_32_64(x) \
glue(glue(case INDEX_op_, x), _i32): \
glue(glue(case INDEX_op_, x), _i64)
#define CASE_OP_32_64_VEC(x) \
glue(glue(case INDEX_op_, x), _i32): \
glue(glue(case INDEX_op_, x), _i64): \
glue(glue(case INDEX_op_, x), _vec)
typedef struct MemCopyInfo {
IntervalTreeNode itree;
QSIMPLEQ_ENTRY (MemCopyInfo) next;
TCGTemp *ts;
TCGType type;
} MemCopyInfo;
typedef struct TempOptInfo {
bool is_const;
TCGTemp *prev_copy;
TCGTemp *next_copy;
QSIMPLEQ_HEAD(, MemCopyInfo) mem_copy;
uint64_t val;
uint64_t z_mask; /* mask bit is 0 if and only if value bit is 0 */
uint64_t s_mask; /* a left-aligned mask of clrsb(value) bits. */
} TempOptInfo;
typedef struct OptContext {
TCGContext *tcg;
TCGOp *prev_mb;
TCGTempSet temps_used;
IntervalTreeRoot mem_copy;
QSIMPLEQ_HEAD(, MemCopyInfo) mem_free;
/* In flight values from optimization. */
uint64_t a_mask; /* mask bit is 0 iff value identical to first input */
uint64_t z_mask; /* mask bit is 0 iff value bit is 0 */
uint64_t s_mask; /* mask of clrsb(value) bits */
TCGType type;
} OptContext;
/* Calculate the smask for a specific value. */
static uint64_t smask_from_value(uint64_t value)
{
int rep = clrsb64(value);
return ~(~0ull >> rep);
}
/*
* Calculate the smask for a given set of known-zeros.
* If there are lots of zeros on the left, we can consider the remainder
* an unsigned field, and thus the corresponding signed field is one bit
* larger.
*/
static uint64_t smask_from_zmask(uint64_t zmask)
{
/*
* Only the 0 bits are significant for zmask, thus the msb itself
* must be zero, else we have no sign information.
*/
int rep = clz64(zmask);
if (rep == 0) {
return 0;
}
rep -= 1;
return ~(~0ull >> rep);
}
/*
* Recreate a properly left-aligned smask after manipulation.
* Some bit-shuffling, particularly shifts and rotates, may
* retain sign bits on the left, but may scatter disconnected
* sign bits on the right. Retain only what remains to the left.
*/
static uint64_t smask_from_smask(int64_t smask)
{
/* Only the 1 bits are significant for smask */
return smask_from_zmask(~smask);
}
static inline TempOptInfo *ts_info(TCGTemp *ts)
{
return ts->state_ptr;
}
static inline TempOptInfo *arg_info(TCGArg arg)
{
return ts_info(arg_temp(arg));
}
static inline bool ts_is_const(TCGTemp *ts)
{
return ts_info(ts)->is_const;
}
static inline bool ts_is_const_val(TCGTemp *ts, uint64_t val)
{
TempOptInfo *ti = ts_info(ts);
return ti->is_const && ti->val == val;
}
static inline bool arg_is_const(TCGArg arg)
{
return ts_is_const(arg_temp(arg));
}
static inline bool arg_is_const_val(TCGArg arg, uint64_t val)
{
return ts_is_const_val(arg_temp(arg), val);
}
static inline bool ts_is_copy(TCGTemp *ts)
{
return ts_info(ts)->next_copy != ts;
}
static TCGTemp *cmp_better_copy(TCGTemp *a, TCGTemp *b)
{
return a->kind < b->kind ? b : a;
}
/* Initialize and activate a temporary. */
static void init_ts_info(OptContext *ctx, TCGTemp *ts)
{
size_t idx = temp_idx(ts);
TempOptInfo *ti;
if (test_bit(idx, ctx->temps_used.l)) {
return;
}
set_bit(idx, ctx->temps_used.l);
ti = ts->state_ptr;
if (ti == NULL) {
ti = tcg_malloc(sizeof(TempOptInfo));
ts->state_ptr = ti;
}
ti->next_copy = ts;
ti->prev_copy = ts;
QSIMPLEQ_INIT(&ti->mem_copy);
if (ts->kind == TEMP_CONST) {
ti->is_const = true;
ti->val = ts->val;
ti->z_mask = ts->val;
ti->s_mask = smask_from_value(ts->val);
} else {
ti->is_const = false;
ti->z_mask = -1;
ti->s_mask = 0;
}
}
static MemCopyInfo *mem_copy_first(OptContext *ctx, intptr_t s, intptr_t l)
{
IntervalTreeNode *r = interval_tree_iter_first(&ctx->mem_copy, s, l);
return r ? container_of(r, MemCopyInfo, itree) : NULL;
}
static MemCopyInfo *mem_copy_next(MemCopyInfo *mem, intptr_t s, intptr_t l)
{
IntervalTreeNode *r = interval_tree_iter_next(&mem->itree, s, l);
return r ? container_of(r, MemCopyInfo, itree) : NULL;
}
static void remove_mem_copy(OptContext *ctx, MemCopyInfo *mc)
{
TCGTemp *ts = mc->ts;
TempOptInfo *ti = ts_info(ts);
interval_tree_remove(&mc->itree, &ctx->mem_copy);
QSIMPLEQ_REMOVE(&ti->mem_copy, mc, MemCopyInfo, next);
QSIMPLEQ_INSERT_TAIL(&ctx->mem_free, mc, next);
}
static void remove_mem_copy_in(OptContext *ctx, intptr_t s, intptr_t l)
{
while (true) {
MemCopyInfo *mc = mem_copy_first(ctx, s, l);
if (!mc) {
break;
}
remove_mem_copy(ctx, mc);
}
}
static void remove_mem_copy_all(OptContext *ctx)
{
remove_mem_copy_in(ctx, 0, -1);
tcg_debug_assert(interval_tree_is_empty(&ctx->mem_copy));
}
static TCGTemp *find_better_copy(TCGTemp *ts)
{
TCGTemp *i, *ret;
/* If this is already readonly, we can't do better. */
if (temp_readonly(ts)) {
return ts;
}
ret = ts;
for (i = ts_info(ts)->next_copy; i != ts; i = ts_info(i)->next_copy) {
ret = cmp_better_copy(ret, i);
}
return ret;
}
static void move_mem_copies(TCGTemp *dst_ts, TCGTemp *src_ts)
{
TempOptInfo *si = ts_info(src_ts);
TempOptInfo *di = ts_info(dst_ts);
MemCopyInfo *mc;
QSIMPLEQ_FOREACH(mc, &si->mem_copy, next) {
tcg_debug_assert(mc->ts == src_ts);
mc->ts = dst_ts;
}
QSIMPLEQ_CONCAT(&di->mem_copy, &si->mem_copy);
}
/* Reset TEMP's state, possibly removing the temp for the list of copies. */
static void reset_ts(OptContext *ctx, TCGTemp *ts)
{
TempOptInfo *ti = ts_info(ts);
TCGTemp *pts = ti->prev_copy;
TCGTemp *nts = ti->next_copy;
TempOptInfo *pi = ts_info(pts);
TempOptInfo *ni = ts_info(nts);
ni->prev_copy = ti->prev_copy;
pi->next_copy = ti->next_copy;
ti->next_copy = ts;
ti->prev_copy = ts;
ti->is_const = false;
ti->z_mask = -1;
ti->s_mask = 0;
if (!QSIMPLEQ_EMPTY(&ti->mem_copy)) {
if (ts == nts) {
/* Last temp copy being removed, the mem copies die. */
MemCopyInfo *mc;
QSIMPLEQ_FOREACH(mc, &ti->mem_copy, next) {
interval_tree_remove(&mc->itree, &ctx->mem_copy);
}
QSIMPLEQ_CONCAT(&ctx->mem_free, &ti->mem_copy);
} else {
move_mem_copies(find_better_copy(nts), ts);
}
}
}
static void reset_temp(OptContext *ctx, TCGArg arg)
{
reset_ts(ctx, arg_temp(arg));
}
static void record_mem_copy(OptContext *ctx, TCGType type,
TCGTemp *ts, intptr_t start, intptr_t last)
{
MemCopyInfo *mc;
TempOptInfo *ti;
mc = QSIMPLEQ_FIRST(&ctx->mem_free);
if (mc) {
QSIMPLEQ_REMOVE_HEAD(&ctx->mem_free, next);
} else {
mc = tcg_malloc(sizeof(*mc));
}
memset(mc, 0, sizeof(*mc));
mc->itree.start = start;
mc->itree.last = last;
mc->type = type;
interval_tree_insert(&mc->itree, &ctx->mem_copy);
ts = find_better_copy(ts);
ti = ts_info(ts);
mc->ts = ts;
QSIMPLEQ_INSERT_TAIL(&ti->mem_copy, mc, next);
}
static bool ts_are_copies(TCGTemp *ts1, TCGTemp *ts2)
{
TCGTemp *i;
if (ts1 == ts2) {
return true;
}
if (!ts_is_copy(ts1) || !ts_is_copy(ts2)) {
return false;
}
for (i = ts_info(ts1)->next_copy; i != ts1; i = ts_info(i)->next_copy) {
if (i == ts2) {
return true;
}
}
return false;
}
static bool args_are_copies(TCGArg arg1, TCGArg arg2)
{
return ts_are_copies(arg_temp(arg1), arg_temp(arg2));
}
static TCGTemp *find_mem_copy_for(OptContext *ctx, TCGType type, intptr_t s)
{
MemCopyInfo *mc;
for (mc = mem_copy_first(ctx, s, s); mc; mc = mem_copy_next(mc, s, s)) {
if (mc->itree.start == s && mc->type == type) {
return find_better_copy(mc->ts);
}
}
return NULL;
}
static TCGArg arg_new_constant(OptContext *ctx, uint64_t val)
{
TCGType type = ctx->type;
TCGTemp *ts;
if (type == TCG_TYPE_I32) {
val = (int32_t)val;
}
ts = tcg_constant_internal(type, val);
init_ts_info(ctx, ts);
return temp_arg(ts);
}
static TCGArg arg_new_temp(OptContext *ctx)
{
TCGTemp *ts = tcg_temp_new_internal(ctx->type, TEMP_EBB);
init_ts_info(ctx, ts);
return temp_arg(ts);
}
static bool tcg_opt_gen_mov(OptContext *ctx, TCGOp *op, TCGArg dst, TCGArg src)
{
TCGTemp *dst_ts = arg_temp(dst);
TCGTemp *src_ts = arg_temp(src);
TempOptInfo *di;
TempOptInfo *si;
TCGOpcode new_op;
if (ts_are_copies(dst_ts, src_ts)) {
tcg_op_remove(ctx->tcg, op);
return true;
}
reset_ts(ctx, dst_ts);
di = ts_info(dst_ts);
si = ts_info(src_ts);
switch (ctx->type) {
case TCG_TYPE_I32:
new_op = INDEX_op_mov_i32;
break;
case TCG_TYPE_I64:
new_op = INDEX_op_mov_i64;
break;
case TCG_TYPE_V64:
case TCG_TYPE_V128:
case TCG_TYPE_V256:
/* TCGOP_VECL and TCGOP_VECE remain unchanged. */
new_op = INDEX_op_mov_vec;
break;
default:
g_assert_not_reached();
}
op->opc = new_op;
op->args[0] = dst;
op->args[1] = src;
di->z_mask = si->z_mask;
di->s_mask = si->s_mask;
if (src_ts->type == dst_ts->type) {
TempOptInfo *ni = ts_info(si->next_copy);
di->next_copy = si->next_copy;
di->prev_copy = src_ts;
ni->prev_copy = dst_ts;
si->next_copy = dst_ts;
di->is_const = si->is_const;
di->val = si->val;
if (!QSIMPLEQ_EMPTY(&si->mem_copy)
&& cmp_better_copy(src_ts, dst_ts) == dst_ts) {
move_mem_copies(dst_ts, src_ts);
}
}
return true;
}
static bool tcg_opt_gen_movi(OptContext *ctx, TCGOp *op,
TCGArg dst, uint64_t val)
{
/* Convert movi to mov with constant temp. */
return tcg_opt_gen_mov(ctx, op, dst, arg_new_constant(ctx, val));
}
static uint64_t do_constant_folding_2(TCGOpcode op, uint64_t x, uint64_t y)
{
uint64_t l64, h64;
switch (op) {
CASE_OP_32_64(add):
return x + y;
CASE_OP_32_64(sub):
return x - y;
CASE_OP_32_64(mul):
return x * y;
CASE_OP_32_64_VEC(and):
return x & y;
CASE_OP_32_64_VEC(or):
return x | y;
CASE_OP_32_64_VEC(xor):
return x ^ y;
case INDEX_op_shl_i32:
return (uint32_t)x << (y & 31);
case INDEX_op_shl_i64:
return (uint64_t)x << (y & 63);
case INDEX_op_shr_i32:
return (uint32_t)x >> (y & 31);
case INDEX_op_shr_i64:
return (uint64_t)x >> (y & 63);
case INDEX_op_sar_i32:
return (int32_t)x >> (y & 31);
case INDEX_op_sar_i64:
return (int64_t)x >> (y & 63);
case INDEX_op_rotr_i32:
return ror32(x, y & 31);
case INDEX_op_rotr_i64:
return ror64(x, y & 63);
case INDEX_op_rotl_i32:
return rol32(x, y & 31);
case INDEX_op_rotl_i64:
return rol64(x, y & 63);
CASE_OP_32_64_VEC(not):
return ~x;
CASE_OP_32_64(neg):
return -x;
CASE_OP_32_64_VEC(andc):
return x & ~y;
CASE_OP_32_64_VEC(orc):
return x | ~y;
CASE_OP_32_64_VEC(eqv):
return ~(x ^ y);
CASE_OP_32_64_VEC(nand):
return ~(x & y);
CASE_OP_32_64_VEC(nor):
return ~(x | y);
case INDEX_op_clz_i32:
return (uint32_t)x ? clz32(x) : y;
case INDEX_op_clz_i64:
return x ? clz64(x) : y;
case INDEX_op_ctz_i32:
return (uint32_t)x ? ctz32(x) : y;
case INDEX_op_ctz_i64:
return x ? ctz64(x) : y;
case INDEX_op_ctpop_i32:
return ctpop32(x);
case INDEX_op_ctpop_i64:
return ctpop64(x);
CASE_OP_32_64(ext8s):
return (int8_t)x;
CASE_OP_32_64(ext16s):
return (int16_t)x;
CASE_OP_32_64(ext8u):
return (uint8_t)x;
CASE_OP_32_64(ext16u):
return (uint16_t)x;
CASE_OP_32_64(bswap16):
x = bswap16(x);
return y & TCG_BSWAP_OS ? (int16_t)x : x;
CASE_OP_32_64(bswap32):
x = bswap32(x);
return y & TCG_BSWAP_OS ? (int32_t)x : x;
case INDEX_op_bswap64_i64:
return bswap64(x);
case INDEX_op_ext_i32_i64:
case INDEX_op_ext32s_i64:
return (int32_t)x;
case INDEX_op_extu_i32_i64:
case INDEX_op_extrl_i64_i32:
case INDEX_op_ext32u_i64:
return (uint32_t)x;
case INDEX_op_extrh_i64_i32:
return (uint64_t)x >> 32;
case INDEX_op_muluh_i32:
return ((uint64_t)(uint32_t)x * (uint32_t)y) >> 32;
case INDEX_op_mulsh_i32:
return ((int64_t)(int32_t)x * (int32_t)y) >> 32;
case INDEX_op_muluh_i64:
mulu64(&l64, &h64, x, y);
return h64;
case INDEX_op_mulsh_i64:
muls64(&l64, &h64, x, y);
return h64;
case INDEX_op_div_i32:
/* Avoid crashing on divide by zero, otherwise undefined. */
return (int32_t)x / ((int32_t)y ? : 1);
case INDEX_op_divu_i32:
return (uint32_t)x / ((uint32_t)y ? : 1);
case INDEX_op_div_i64:
return (int64_t)x / ((int64_t)y ? : 1);
case INDEX_op_divu_i64:
return (uint64_t)x / ((uint64_t)y ? : 1);
case INDEX_op_rem_i32:
return (int32_t)x % ((int32_t)y ? : 1);
case INDEX_op_remu_i32:
return (uint32_t)x % ((uint32_t)y ? : 1);
case INDEX_op_rem_i64:
return (int64_t)x % ((int64_t)y ? : 1);
case INDEX_op_remu_i64:
return (uint64_t)x % ((uint64_t)y ? : 1);
default:
g_assert_not_reached();
}
}
static uint64_t do_constant_folding(TCGOpcode op, TCGType type,
uint64_t x, uint64_t y)
{
uint64_t res = do_constant_folding_2(op, x, y);
if (type == TCG_TYPE_I32) {
res = (int32_t)res;
}
return res;
}
static bool do_constant_folding_cond_32(uint32_t x, uint32_t y, TCGCond c)
{
switch (c) {
case TCG_COND_EQ:
return x == y;
case TCG_COND_NE:
return x != y;
case TCG_COND_LT:
return (int32_t)x < (int32_t)y;
case TCG_COND_GE:
return (int32_t)x >= (int32_t)y;
case TCG_COND_LE:
return (int32_t)x <= (int32_t)y;
case TCG_COND_GT:
return (int32_t)x > (int32_t)y;
case TCG_COND_LTU:
return x < y;
case TCG_COND_GEU:
return x >= y;
case TCG_COND_LEU:
return x <= y;
case TCG_COND_GTU:
return x > y;
case TCG_COND_TSTEQ:
return (x & y) == 0;
case TCG_COND_TSTNE:
return (x & y) != 0;
case TCG_COND_ALWAYS:
case TCG_COND_NEVER:
break;
}
g_assert_not_reached();
}
static bool do_constant_folding_cond_64(uint64_t x, uint64_t y, TCGCond c)
{
switch (c) {
case TCG_COND_EQ:
return x == y;
case TCG_COND_NE:
return x != y;
case TCG_COND_LT:
return (int64_t)x < (int64_t)y;
case TCG_COND_GE:
return (int64_t)x >= (int64_t)y;
case TCG_COND_LE:
return (int64_t)x <= (int64_t)y;
case TCG_COND_GT:
return (int64_t)x > (int64_t)y;
case TCG_COND_LTU:
return x < y;
case TCG_COND_GEU:
return x >= y;
case TCG_COND_LEU:
return x <= y;
case TCG_COND_GTU:
return x > y;
case TCG_COND_TSTEQ:
return (x & y) == 0;
case TCG_COND_TSTNE:
return (x & y) != 0;
case TCG_COND_ALWAYS:
case TCG_COND_NEVER:
break;
}
g_assert_not_reached();
}
static int do_constant_folding_cond_eq(TCGCond c)
{
switch (c) {
case TCG_COND_GT:
case TCG_COND_LTU:
case TCG_COND_LT:
case TCG_COND_GTU:
case TCG_COND_NE:
return 0;
case TCG_COND_GE:
case TCG_COND_GEU:
case TCG_COND_LE:
case TCG_COND_LEU:
case TCG_COND_EQ:
return 1;
case TCG_COND_TSTEQ:
case TCG_COND_TSTNE:
return -1;
case TCG_COND_ALWAYS:
case TCG_COND_NEVER:
break;
}
g_assert_not_reached();
}
/*
* Return -1 if the condition can't be simplified,
* and the result of the condition (0 or 1) if it can.
*/
static int do_constant_folding_cond(TCGType type, TCGArg x,
TCGArg y, TCGCond c)
{
if (arg_is_const(x) && arg_is_const(y)) {
uint64_t xv = arg_info(x)->val;
uint64_t yv = arg_info(y)->val;
switch (type) {
case TCG_TYPE_I32:
return do_constant_folding_cond_32(xv, yv, c);
case TCG_TYPE_I64:
return do_constant_folding_cond_64(xv, yv, c);
default:
/* Only scalar comparisons are optimizable */
return -1;
}
} else if (args_are_copies(x, y)) {
return do_constant_folding_cond_eq(c);
} else if (arg_is_const_val(y, 0)) {
switch (c) {
case TCG_COND_LTU:
case TCG_COND_TSTNE:
return 0;
case TCG_COND_GEU:
case TCG_COND_TSTEQ:
return 1;
default:
return -1;
}
}
return -1;
}
/**
* swap_commutative:
* @dest: TCGArg of the destination argument, or NO_DEST.
* @p1: first paired argument
* @p2: second paired argument
*
* If *@p1 is a constant and *@p2 is not, swap.
* If *@p2 matches @dest, swap.
* Return true if a swap was performed.
*/
#define NO_DEST temp_arg(NULL)
static bool swap_commutative(TCGArg dest, TCGArg *p1, TCGArg *p2)
{
TCGArg a1 = *p1, a2 = *p2;
int sum = 0;
sum += arg_is_const(a1);
sum -= arg_is_const(a2);
/* Prefer the constant in second argument, and then the form
op a, a, b, which is better handled on non-RISC hosts. */
if (sum > 0 || (sum == 0 && dest == a2)) {
*p1 = a2;
*p2 = a1;
return true;
}
return false;
}
static bool swap_commutative2(TCGArg *p1, TCGArg *p2)
{
int sum = 0;
sum += arg_is_const(p1[0]);
sum += arg_is_const(p1[1]);
sum -= arg_is_const(p2[0]);
sum -= arg_is_const(p2[1]);
if (sum > 0) {
TCGArg t;
t = p1[0], p1[0] = p2[0], p2[0] = t;
t = p1[1], p1[1] = p2[1], p2[1] = t;
return true;
}
return false;
}
/*
* Return -1 if the condition can't be simplified,
* and the result of the condition (0 or 1) if it can.
*/
static int do_constant_folding_cond1(OptContext *ctx, TCGOp *op, TCGArg dest,
TCGArg *p1, TCGArg *p2, TCGArg *pcond)
{
TCGCond cond;
bool swap;
int r;
swap = swap_commutative(dest, p1, p2);
cond = *pcond;
if (swap) {
*pcond = cond = tcg_swap_cond(cond);
}
r = do_constant_folding_cond(ctx->type, *p1, *p2, cond);
if (r >= 0) {
return r;
}
if (!is_tst_cond(cond)) {
return -1;
}
/*
* TSTNE x,x -> NE x,0
* TSTNE x,-1 -> NE x,0
*/
if (args_are_copies(*p1, *p2) || arg_is_const_val(*p2, -1)) {
*p2 = arg_new_constant(ctx, 0);
*pcond = tcg_tst_eqne_cond(cond);
return -1;
}
/* TSTNE x,sign -> LT x,0 */
if (arg_is_const_val(*p2, (ctx->type == TCG_TYPE_I32
? INT32_MIN : INT64_MIN))) {
*p2 = arg_new_constant(ctx, 0);
*pcond = tcg_tst_ltge_cond(cond);
return -1;
}
/* Expand to AND with a temporary if no backend support. */
if (!TCG_TARGET_HAS_tst) {
TCGOpcode and_opc = (ctx->type == TCG_TYPE_I32
? INDEX_op_and_i32 : INDEX_op_and_i64);
TCGOp *op2 = tcg_op_insert_before(ctx->tcg, op, and_opc, 3);
TCGArg tmp = arg_new_temp(ctx);
op2->args[0] = tmp;
op2->args[1] = *p1;
op2->args[2] = *p2;
*p1 = tmp;
*p2 = arg_new_constant(ctx, 0);
*pcond = tcg_tst_eqne_cond(cond);
}
return -1;
}
static int do_constant_folding_cond2(OptContext *ctx, TCGOp *op, TCGArg *args)
{
TCGArg al, ah, bl, bh;
TCGCond c;
bool swap;
int r;
swap = swap_commutative2(args, args + 2);
c = args[4];
if (swap) {
args[4] = c = tcg_swap_cond(c);
}
al = args[0];
ah = args[1];
bl = args[2];
bh = args[3];
if (arg_is_const(bl) && arg_is_const(bh)) {
tcg_target_ulong blv = arg_info(bl)->val;
tcg_target_ulong bhv = arg_info(bh)->val;
uint64_t b = deposit64(blv, 32, 32, bhv);
if (arg_is_const(al) && arg_is_const(ah)) {
tcg_target_ulong alv = arg_info(al)->val;
tcg_target_ulong ahv = arg_info(ah)->val;
uint64_t a = deposit64(alv, 32, 32, ahv);
r = do_constant_folding_cond_64(a, b, c);
if (r >= 0) {
return r;
}
}
if (b == 0) {
switch (c) {
case TCG_COND_LTU:
case TCG_COND_TSTNE:
return 0;
case TCG_COND_GEU:
case TCG_COND_TSTEQ:
return 1;
default:
break;
}
}
/* TSTNE x,-1 -> NE x,0 */
if (b == -1 && is_tst_cond(c)) {
args[3] = args[2] = arg_new_constant(ctx, 0);
args[4] = tcg_tst_eqne_cond(c);
return -1;
}
/* TSTNE x,sign -> LT x,0 */
if (b == INT64_MIN && is_tst_cond(c)) {
/* bl must be 0, so copy that to bh */
args[3] = bl;
args[4] = tcg_tst_ltge_cond(c);
return -1;
}
}
if (args_are_copies(al, bl) && args_are_copies(ah, bh)) {
r = do_constant_folding_cond_eq(c);
if (r >= 0) {
return r;
}
/* TSTNE x,x -> NE x,0 */
if (is_tst_cond(c)) {
args[3] = args[2] = arg_new_constant(ctx, 0);
args[4] = tcg_tst_eqne_cond(c);
return -1;
}
}
/* Expand to AND with a temporary if no backend support. */
if (!TCG_TARGET_HAS_tst && is_tst_cond(c)) {
TCGOp *op1 = tcg_op_insert_before(ctx->tcg, op, INDEX_op_and_i32, 3);
TCGOp *op2 = tcg_op_insert_before(ctx->tcg, op, INDEX_op_and_i32, 3);
TCGArg t1 = arg_new_temp(ctx);
TCGArg t2 = arg_new_temp(ctx);
op1->args[0] = t1;
op1->args[1] = al;
op1->args[2] = bl;
op2->args[0] = t2;
op2->args[1] = ah;
op2->args[2] = bh;
args[0] = t1;
args[1] = t2;
args[3] = args[2] = arg_new_constant(ctx, 0);
args[4] = tcg_tst_eqne_cond(c);
}
return -1;
}
static void init_arguments(OptContext *ctx, TCGOp *op, int nb_args)
{
for (int i = 0; i < nb_args; i++) {
TCGTemp *ts = arg_temp(op->args[i]);
init_ts_info(ctx, ts);
}
}
static void copy_propagate(OptContext *ctx, TCGOp *op,
int nb_oargs, int nb_iargs)
{
for (int i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
TCGTemp *ts = arg_temp(op->args[i]);
if (ts_is_copy(ts)) {
op->args[i] = temp_arg(find_better_copy(ts));
}
}
}
static void finish_folding(OptContext *ctx, TCGOp *op)
{
const TCGOpDef *def = &tcg_op_defs[op->opc];
int i, nb_oargs;
/*
* We only optimize extended basic blocks. If the opcode ends a BB
* and is not a conditional branch, reset all temp data.
*/
if (def->flags & TCG_OPF_BB_END) {
ctx->prev_mb = NULL;
if (!(def->flags & TCG_OPF_COND_BRANCH)) {
memset(&ctx->temps_used, 0, sizeof(ctx->temps_used));
remove_mem_copy_all(ctx);
}
return;
}
nb_oargs = def->nb_oargs;
for (i = 0; i < nb_oargs; i++) {
TCGTemp *ts = arg_temp(op->args[i]);
reset_ts(ctx, ts);
/*
* Save the corresponding known-zero/sign bits mask for the
* first output argument (only one supported so far).
*/
if (i == 0) {
ts_info(ts)->z_mask = ctx->z_mask;
ts_info(ts)->s_mask = ctx->s_mask;
}
}
}
/*
* The fold_* functions return true when processing is complete,
* usually by folding the operation to a constant or to a copy,
* and calling tcg_opt_gen_{mov,movi}. They may do other things,
* like collect information about the value produced, for use in
* optimizing a subsequent operation.
*
* These first fold_* functions are all helpers, used by other
* folders for more specific operations.
*/
static bool fold_const1(OptContext *ctx, TCGOp *op)
{
if (arg_is_const(op->args[1])) {
uint64_t t;
t = arg_info(op->args[1])->val;
t = do_constant_folding(op->opc, ctx->type, t, 0);
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
}
return false;
}
static bool fold_const2(OptContext *ctx, TCGOp *op)
{
if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) {
uint64_t t1 = arg_info(op->args[1])->val;
uint64_t t2 = arg_info(op->args[2])->val;
t1 = do_constant_folding(op->opc, ctx->type, t1, t2);
return tcg_opt_gen_movi(ctx, op, op->args[0], t1);
}
return false;
}
static bool fold_commutative(OptContext *ctx, TCGOp *op)
{
swap_commutative(op->args[0], &op->args[1], &op->args[2]);
return false;
}
static bool fold_const2_commutative(OptContext *ctx, TCGOp *op)
{
swap_commutative(op->args[0], &op->args[1], &op->args[2]);
return fold_const2(ctx, op);
}
static bool fold_masks(OptContext *ctx, TCGOp *op)
{
uint64_t a_mask = ctx->a_mask;
uint64_t z_mask = ctx->z_mask;
uint64_t s_mask = ctx->s_mask;
/*
* 32-bit ops generate 32-bit results, which for the purpose of
* simplifying tcg are sign-extended. Certainly that's how we
* represent our constants elsewhere. Note that the bits will
* be reset properly for a 64-bit value when encountering the
* type changing opcodes.
*/
if (ctx->type == TCG_TYPE_I32) {
a_mask = (int32_t)a_mask;
z_mask = (int32_t)z_mask;
s_mask |= MAKE_64BIT_MASK(32, 32);
ctx->z_mask = z_mask;
ctx->s_mask = s_mask;
}
if (z_mask == 0) {
return tcg_opt_gen_movi(ctx, op, op->args[0], 0);
}
if (a_mask == 0) {
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]);
}
return false;
}
/*
* Convert @op to NOT, if NOT is supported by the host.
* Return true f the conversion is successful, which will still
* indicate that the processing is complete.
*/
static bool fold_not(OptContext *ctx, TCGOp *op);
static bool fold_to_not(OptContext *ctx, TCGOp *op, int idx)
{
TCGOpcode not_op;
bool have_not;
switch (ctx->type) {
case TCG_TYPE_I32:
not_op = INDEX_op_not_i32;
have_not = TCG_TARGET_HAS_not_i32;
break;
case TCG_TYPE_I64:
not_op = INDEX_op_not_i64;
have_not = TCG_TARGET_HAS_not_i64;
break;
case TCG_TYPE_V64:
case TCG_TYPE_V128:
case TCG_TYPE_V256:
not_op = INDEX_op_not_vec;
have_not = TCG_TARGET_HAS_not_vec;
break;
default:
g_assert_not_reached();
}
if (have_not) {
op->opc = not_op;
op->args[1] = op->args[idx];
return fold_not(ctx, op);
}
return false;
}
/* If the binary operation has first argument @i, fold to @i. */
static bool fold_ix_to_i(OptContext *ctx, TCGOp *op, uint64_t i)
{
if (arg_is_const_val(op->args[1], i)) {
return tcg_opt_gen_movi(ctx, op, op->args[0], i);
}
return false;
}
/* If the binary operation has first argument @i, fold to NOT. */
static bool fold_ix_to_not(OptContext *ctx, TCGOp *op, uint64_t i)
{
if (arg_is_const_val(op->args[1], i)) {
return fold_to_not(ctx, op, 2);
}
return false;
}
/* If the binary operation has second argument @i, fold to @i. */
static bool fold_xi_to_i(OptContext *ctx, TCGOp *op, uint64_t i)
{
if (arg_is_const_val(op->args[2], i)) {
return tcg_opt_gen_movi(ctx, op, op->args[0], i);
}
return false;
}
/* If the binary operation has second argument @i, fold to identity. */
static bool fold_xi_to_x(OptContext *ctx, TCGOp *op, uint64_t i)
{
if (arg_is_const_val(op->args[2], i)) {
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]);
}
return false;
}
/* If the binary operation has second argument @i, fold to NOT. */
static bool fold_xi_to_not(OptContext *ctx, TCGOp *op, uint64_t i)
{
if (arg_is_const_val(op->args[2], i)) {
return fold_to_not(ctx, op, 1);
}
return false;
}
/* If the binary operation has both arguments equal, fold to @i. */
static bool fold_xx_to_i(OptContext *ctx, TCGOp *op, uint64_t i)
{
if (args_are_copies(op->args[1], op->args[2])) {
return tcg_opt_gen_movi(ctx, op, op->args[0], i);
}
return false;
}
/* If the binary operation has both arguments equal, fold to identity. */
static bool fold_xx_to_x(OptContext *ctx, TCGOp *op)
{
if (args_are_copies(op->args[1], op->args[2])) {
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]);
}
return false;
}
/*
* These outermost fold_<op> functions are sorted alphabetically.
*
* The ordering of the transformations should be:
* 1) those that produce a constant
* 2) those that produce a copy
* 3) those that produce information about the result value.
*/
static bool fold_add(OptContext *ctx, TCGOp *op)
{
if (fold_const2_commutative(ctx, op) ||
fold_xi_to_x(ctx, op, 0)) {
return true;
}
return false;
}
/* We cannot as yet do_constant_folding with vectors. */
static bool fold_add_vec(OptContext *ctx, TCGOp *op)
{
if (fold_commutative(ctx, op) ||
fold_xi_to_x(ctx, op, 0)) {
return true;
}
return false;
}
static bool fold_addsub2(OptContext *ctx, TCGOp *op, bool add)
{
bool a_const = arg_is_const(op->args[2]) && arg_is_const(op->args[3]);
bool b_const = arg_is_const(op->args[4]) && arg_is_const(op->args[5]);
if (a_const && b_const) {
uint64_t al = arg_info(op->args[2])->val;
uint64_t ah = arg_info(op->args[3])->val;
uint64_t bl = arg_info(op->args[4])->val;
uint64_t bh = arg_info(op->args[5])->val;
TCGArg rl, rh;
TCGOp *op2;
if (ctx->type == TCG_TYPE_I32) {
uint64_t a = deposit64(al, 32, 32, ah);
uint64_t b = deposit64(bl, 32, 32, bh);
if (add) {
a += b;
} else {
a -= b;
}
al = sextract64(a, 0, 32);
ah = sextract64(a, 32, 32);
} else {
Int128 a = int128_make128(al, ah);
Int128 b = int128_make128(bl, bh);
if (add) {
a = int128_add(a, b);
} else {
a = int128_sub(a, b);
}
al = int128_getlo(a);
ah = int128_gethi(a);
}
rl = op->args[0];
rh = op->args[1];
/* The proper opcode is supplied by tcg_opt_gen_mov. */
op2 = tcg_op_insert_before(ctx->tcg, op, 0, 2);
tcg_opt_gen_movi(ctx, op, rl, al);
tcg_opt_gen_movi(ctx, op2, rh, ah);
return true;
}
/* Fold sub2 r,x,i to add2 r,x,-i */
if (!add && b_const) {
uint64_t bl = arg_info(op->args[4])->val;
uint64_t bh = arg_info(op->args[5])->val;
/* Negate the two parts without assembling and disassembling. */
bl = -bl;
bh = ~bh + !bl;
op->opc = (ctx->type == TCG_TYPE_I32
? INDEX_op_add2_i32 : INDEX_op_add2_i64);
op->args[4] = arg_new_constant(ctx, bl);
op->args[5] = arg_new_constant(ctx, bh);
}
return false;
}
static bool fold_add2(OptContext *ctx, TCGOp *op)
{
/* Note that the high and low parts may be independently swapped. */
swap_commutative(op->args[0], &op->args[2], &op->args[4]);
swap_commutative(op->args[1], &op->args[3], &op->args[5]);
return fold_addsub2(ctx, op, true);
}
static bool fold_and(OptContext *ctx, TCGOp *op)
{
uint64_t z1, z2;
if (fold_const2_commutative(ctx, op) ||
fold_xi_to_i(ctx, op, 0) ||
fold_xi_to_x(ctx, op, -1) ||
fold_xx_to_x(ctx, op)) {
return true;
}
z1 = arg_info(op->args[1])->z_mask;
z2 = arg_info(op->args[2])->z_mask;
ctx->z_mask = z1 & z2;
/*
* Sign repetitions are perforce all identical, whether they are 1 or 0.
* Bitwise operations preserve the relative quantity of the repetitions.
*/
ctx->s_mask = arg_info(op->args[1])->s_mask
& arg_info(op->args[2])->s_mask;
/*
* Known-zeros does not imply known-ones. Therefore unless
* arg2 is constant, we can't infer affected bits from it.
*/
if (arg_is_const(op->args[2])) {
ctx->a_mask = z1 & ~z2;
}
return fold_masks(ctx, op);
}
static bool fold_andc(OptContext *ctx, TCGOp *op)
{
uint64_t z1;
if (fold_const2(ctx, op) ||
fold_xx_to_i(ctx, op, 0) ||
fold_xi_to_x(ctx, op, 0) ||
fold_ix_to_not(ctx, op, -1)) {
return true;
}
z1 = arg_info(op->args[1])->z_mask;
/*
* Known-zeros does not imply known-ones. Therefore unless
* arg2 is constant, we can't infer anything from it.
*/
if (arg_is_const(op->args[2])) {
uint64_t z2 = ~arg_info(op->args[2])->z_mask;
ctx->a_mask = z1 & ~z2;
z1 &= z2;
}
ctx->z_mask = z1;
ctx->s_mask = arg_info(op->args[1])->s_mask
& arg_info(op->args[2])->s_mask;
return fold_masks(ctx, op);
}
static bool fold_brcond(OptContext *ctx, TCGOp *op)
{
int i = do_constant_folding_cond1(ctx, op, NO_DEST, &op->args[0],
&op->args[1], &op->args[2]);
if (i == 0) {
tcg_op_remove(ctx->tcg, op);
return true;
}
if (i > 0) {
op->opc = INDEX_op_br;
op->args[0] = op->args[3];
}
return false;
}
static bool fold_brcond2(OptContext *ctx, TCGOp *op)
{
TCGCond cond;
TCGArg label;
int i, inv = 0;
i = do_constant_folding_cond2(ctx, op, &op->args[0]);
cond = op->args[4];
label = op->args[5];
if (i >= 0) {
goto do_brcond_const;
}
switch (cond) {
case TCG_COND_LT:
case TCG_COND_GE:
/*
* Simplify LT/GE comparisons vs zero to a single compare
* vs the high word of the input.
*/
if (arg_is_const_val(op->args[2], 0) &&
arg_is_const_val(op->args[3], 0)) {
goto do_brcond_high;
}
break;
case TCG_COND_NE:
inv = 1;
QEMU_FALLTHROUGH;
case TCG_COND_EQ:
/*
* Simplify EQ/NE comparisons where one of the pairs
* can be simplified.
*/
i = do_constant_folding_cond(TCG_TYPE_I32, op->args[0],
op->args[2], cond);
switch (i ^ inv) {
case 0:
goto do_brcond_const;
case 1:
goto do_brcond_high;
}
i = do_constant_folding_cond(TCG_TYPE_I32, op->args[1],
op->args[3], cond);
switch (i ^ inv) {
case 0:
goto do_brcond_const;
case 1:
goto do_brcond_low;
}
break;
case TCG_COND_TSTEQ:
case TCG_COND_TSTNE:
if (arg_is_const_val(op->args[2], 0)) {
goto do_brcond_high;
}
if (arg_is_const_val(op->args[3], 0)) {
goto do_brcond_low;
}
break;
default:
break;
do_brcond_low:
op->opc = INDEX_op_brcond_i32;
op->args[1] = op->args[2];
op->args[2] = cond;
op->args[3] = label;
return fold_brcond(ctx, op);
do_brcond_high:
op->opc = INDEX_op_brcond_i32;
op->args[0] = op->args[1];
op->args[1] = op->args[3];
op->args[2] = cond;
op->args[3] = label;
return fold_brcond(ctx, op);
do_brcond_const:
if (i == 0) {
tcg_op_remove(ctx->tcg, op);
return true;
}
op->opc = INDEX_op_br;
op->args[0] = label;
break;
}
return false;
}
static bool fold_bswap(OptContext *ctx, TCGOp *op)
{
uint64_t z_mask, s_mask, sign;
if (arg_is_const(op->args[1])) {
uint64_t t = arg_info(op->args[1])->val;
t = do_constant_folding(op->opc, ctx->type, t, op->args[2]);
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
}
z_mask = arg_info(op->args[1])->z_mask;
switch (op->opc) {
case INDEX_op_bswap16_i32:
case INDEX_op_bswap16_i64:
z_mask = bswap16(z_mask);
sign = INT16_MIN;
break;
case INDEX_op_bswap32_i32:
case INDEX_op_bswap32_i64:
z_mask = bswap32(z_mask);
sign = INT32_MIN;
break;
case INDEX_op_bswap64_i64:
z_mask = bswap64(z_mask);
sign = INT64_MIN;
break;
default:
g_assert_not_reached();
}
s_mask = smask_from_zmask(z_mask);
switch (op->args[2] & (TCG_BSWAP_OZ | TCG_BSWAP_OS)) {
case TCG_BSWAP_OZ:
break;
case TCG_BSWAP_OS:
/* If the sign bit may be 1, force all the bits above to 1. */
if (z_mask & sign) {
z_mask |= sign;
s_mask = sign << 1;
}
break;
default:
/* The high bits are undefined: force all bits above the sign to 1. */
z_mask |= sign << 1;
s_mask = 0;
break;
}
ctx->z_mask = z_mask;
ctx->s_mask = s_mask;
return fold_masks(ctx, op);
}
static bool fold_call(OptContext *ctx, TCGOp *op)
{
TCGContext *s = ctx->tcg;
int nb_oargs = TCGOP_CALLO(op);
int nb_iargs = TCGOP_CALLI(op);
int flags, i;
init_arguments(ctx, op, nb_oargs + nb_iargs);
copy_propagate(ctx, op, nb_oargs, nb_iargs);
/* If the function reads or writes globals, reset temp data. */
flags = tcg_call_flags(op);
if (!(flags & (TCG_CALL_NO_READ_GLOBALS | TCG_CALL_NO_WRITE_GLOBALS))) {
int nb_globals = s->nb_globals;
for (i = 0; i < nb_globals; i++) {
if (test_bit(i, ctx->temps_used.l)) {
reset_ts(ctx, &ctx->tcg->temps[i]);
}
}
}
/* If the function has side effects, reset mem data. */
if (!(flags & TCG_CALL_NO_SIDE_EFFECTS)) {
remove_mem_copy_all(ctx);
}
/* Reset temp data for outputs. */
for (i = 0; i < nb_oargs; i++) {
reset_temp(ctx, op->args[i]);
}
/* Stop optimizing MB across calls. */
ctx->prev_mb = NULL;
return true;
}
static bool fold_count_zeros(OptContext *ctx, TCGOp *op)
{
uint64_t z_mask;
if (arg_is_const(op->args[1])) {
uint64_t t = arg_info(op->args[1])->val;
if (t != 0) {
t = do_constant_folding(op->opc, ctx->type, t, 0);
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
}
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[2]);
}
switch (ctx->type) {
case TCG_TYPE_I32:
z_mask = 31;
break;
case TCG_TYPE_I64:
z_mask = 63;
break;
default:
g_assert_not_reached();
}
ctx->z_mask = arg_info(op->args[2])->z_mask | z_mask;
ctx->s_mask = smask_from_zmask(ctx->z_mask);
return false;
}
static bool fold_ctpop(OptContext *ctx, TCGOp *op)
{
if (fold_const1(ctx, op)) {
return true;
}
switch (ctx->type) {
case TCG_TYPE_I32:
ctx->z_mask = 32 | 31;
break;
case TCG_TYPE_I64:
ctx->z_mask = 64 | 63;
break;
default:
g_assert_not_reached();
}
ctx->s_mask = smask_from_zmask(ctx->z_mask);
return false;
}
static bool fold_deposit(OptContext *ctx, TCGOp *op)
{
TCGOpcode and_opc;
if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) {
uint64_t t1 = arg_info(op->args[1])->val;
uint64_t t2 = arg_info(op->args[2])->val;
t1 = deposit64(t1, op->args[3], op->args[4], t2);
return tcg_opt_gen_movi(ctx, op, op->args[0], t1);
}
switch (ctx->type) {
case TCG_TYPE_I32:
and_opc = INDEX_op_and_i32;
break;
case TCG_TYPE_I64:
and_opc = INDEX_op_and_i64;
break;
default:
g_assert_not_reached();
}
/* Inserting a value into zero at offset 0. */
if (arg_is_const_val(op->args[1], 0) && op->args[3] == 0) {
uint64_t mask = MAKE_64BIT_MASK(0, op->args[4]);
op->opc = and_opc;
op->args[1] = op->args[2];
op->args[2] = arg_new_constant(ctx, mask);
ctx->z_mask = mask & arg_info(op->args[1])->z_mask;
return false;
}
/* Inserting zero into a value. */
if (arg_is_const_val(op->args[2], 0)) {
uint64_t mask = deposit64(-1, op->args[3], op->args[4], 0);
op->opc = and_opc;
op->args[2] = arg_new_constant(ctx, mask);
ctx->z_mask = mask & arg_info(op->args[1])->z_mask;
return false;
}
ctx->z_mask = deposit64(arg_info(op->args[1])->z_mask,
op->args[3], op->args[4],
arg_info(op->args[2])->z_mask);
return false;
}
static bool fold_divide(OptContext *ctx, TCGOp *op)
{
if (fold_const2(ctx, op) ||
fold_xi_to_x(ctx, op, 1)) {
return true;
}
return false;
}
static bool fold_dup(OptContext *ctx, TCGOp *op)
{
if (arg_is_const(op->args[1])) {
uint64_t t = arg_info(op->args[1])->val;
t = dup_const(TCGOP_VECE(op), t);
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
}
return false;
}
static bool fold_dup2(OptContext *ctx, TCGOp *op)
{
if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) {
uint64_t t = deposit64(arg_info(op->args[1])->val, 32, 32,
arg_info(op->args[2])->val);
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
}
if (args_are_copies(op->args[1], op->args[2])) {
op->opc = INDEX_op_dup_vec;
TCGOP_VECE(op) = MO_32;
}
return false;
}
static bool fold_eqv(OptContext *ctx, TCGOp *op)
{
if (fold_const2_commutative(ctx, op) ||
fold_xi_to_x(ctx, op, -1) ||
fold_xi_to_not(ctx, op, 0)) {
return true;
}
ctx->s_mask = arg_info(op->args[1])->s_mask
& arg_info(op->args[2])->s_mask;
return false;
}
static bool fold_extract(OptContext *ctx, TCGOp *op)
{
uint64_t z_mask_old, z_mask;
int pos = op->args[2];
int len = op->args[3];
if (arg_is_const(op->args[1])) {
uint64_t t;
t = arg_info(op->args[1])->val;
t = extract64(t, pos, len);
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
}
z_mask_old = arg_info(op->args[1])->z_mask;
z_mask = extract64(z_mask_old, pos, len);
if (pos == 0) {
ctx->a_mask = z_mask_old ^ z_mask;
}
ctx->z_mask = z_mask;
ctx->s_mask = smask_from_zmask(z_mask);
return fold_masks(ctx, op);
}
static bool fold_extract2(OptContext *ctx, TCGOp *op)
{
if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) {
uint64_t v1 = arg_info(op->args[1])->val;
uint64_t v2 = arg_info(op->args[2])->val;
int shr = op->args[3];
if (op->opc == INDEX_op_extract2_i64) {
v1 >>= shr;
v2 <<= 64 - shr;
} else {
v1 = (uint32_t)v1 >> shr;
v2 = (uint64_t)((int32_t)v2 << (32 - shr));
}
return tcg_opt_gen_movi(ctx, op, op->args[0], v1 | v2);
}
return false;
}
static bool fold_exts(OptContext *ctx, TCGOp *op)
{
uint64_t s_mask_old, s_mask, z_mask, sign;
bool type_change = false;
if (fold_const1(ctx, op)) {
return true;
}
z_mask = arg_info(op->args[1])->z_mask;
s_mask = arg_info(op->args[1])->s_mask;
s_mask_old = s_mask;
switch (op->opc) {
CASE_OP_32_64(ext8s):
sign = INT8_MIN;
z_mask = (uint8_t)z_mask;
break;
CASE_OP_32_64(ext16s):
sign = INT16_MIN;
z_mask = (uint16_t)z_mask;
break;
case INDEX_op_ext_i32_i64:
type_change = true;
QEMU_FALLTHROUGH;
case INDEX_op_ext32s_i64:
sign = INT32_MIN;
z_mask = (uint32_t)z_mask;
break;
default:
g_assert_not_reached();
}
if (z_mask & sign) {
z_mask |= sign;
}
s_mask |= sign << 1;
ctx->z_mask = z_mask;
ctx->s_mask = s_mask;
if (!type_change) {
ctx->a_mask = s_mask & ~s_mask_old;
}
return fold_masks(ctx, op);
}
static bool fold_extu(OptContext *ctx, TCGOp *op)
{
uint64_t z_mask_old, z_mask;
bool type_change = false;
if (fold_const1(ctx, op)) {
return true;
}
z_mask_old = z_mask = arg_info(op->args[1])->z_mask;
switch (op->opc) {
CASE_OP_32_64(ext8u):
z_mask = (uint8_t)z_mask;
break;
CASE_OP_32_64(ext16u):
z_mask = (uint16_t)z_mask;
break;
case INDEX_op_extrl_i64_i32:
case INDEX_op_extu_i32_i64:
type_change = true;
QEMU_FALLTHROUGH;
case INDEX_op_ext32u_i64:
z_mask = (uint32_t)z_mask;
break;
case INDEX_op_extrh_i64_i32:
type_change = true;
z_mask >>= 32;
break;
default:
g_assert_not_reached();
}
ctx->z_mask = z_mask;
ctx->s_mask = smask_from_zmask(z_mask);
if (!type_change) {
ctx->a_mask = z_mask_old ^ z_mask;
}
return fold_masks(ctx, op);
}
static bool fold_mb(OptContext *ctx, TCGOp *op)
{
/* Eliminate duplicate and redundant fence instructions. */
if (ctx->prev_mb) {
/*
* Merge two barriers of the same type into one,
* or a weaker barrier into a stronger one,
* or two weaker barriers into a stronger one.
* mb X; mb Y => mb X|Y
* mb; strl => mb; st
* ldaq; mb => ld; mb
* ldaq; strl => ld; mb; st
* Other combinations are also merged into a strong
* barrier. This is stricter than specified but for
* the purposes of TCG is better than not optimizing.
*/
ctx->prev_mb->args[0] |= op->args[0];
tcg_op_remove(ctx->tcg, op);
} else {
ctx->prev_mb = op;
}
return true;
}
static bool fold_mov(OptContext *ctx, TCGOp *op)
{
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]);
}
static bool fold_movcond(OptContext *ctx, TCGOp *op)
{
int i;
/* If true and false values are the same, eliminate the cmp. */
if (args_are_copies(op->args[3], op->args[4])) {
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[3]);
}
/*
* Canonicalize the "false" input reg to match the destination reg so
* that the tcg backend can implement a "move if true" operation.
*/
if (swap_commutative(op->args[0], &op->args[4], &op->args[3])) {
op->args[5] = tcg_invert_cond(op->args[5]);
}
i = do_constant_folding_cond1(ctx, op, NO_DEST, &op->args[1],
&op->args[2], &op->args[5]);
if (i >= 0) {
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[4 - i]);
}
ctx->z_mask = arg_info(op->args[3])->z_mask
| arg_info(op->args[4])->z_mask;
ctx->s_mask = arg_info(op->args[3])->s_mask
& arg_info(op->args[4])->s_mask;
if (arg_is_const(op->args[3]) && arg_is_const(op->args[4])) {
uint64_t tv = arg_info(op->args[3])->val;
uint64_t fv = arg_info(op->args[4])->val;
TCGOpcode opc, negopc = 0;
TCGCond cond = op->args[5];
switch (ctx->type) {
case TCG_TYPE_I32:
opc = INDEX_op_setcond_i32;
if (TCG_TARGET_HAS_negsetcond_i32) {
negopc = INDEX_op_negsetcond_i32;
}
tv = (int32_t)tv;
fv = (int32_t)fv;
break;
case TCG_TYPE_I64:
opc = INDEX_op_setcond_i64;
if (TCG_TARGET_HAS_negsetcond_i64) {
negopc = INDEX_op_negsetcond_i64;
}
break;
default:
g_assert_not_reached();
}
if (tv == 1 && fv == 0) {
op->opc = opc;
op->args[3] = cond;
} else if (fv == 1 && tv == 0) {
op->opc = opc;
op->args[3] = tcg_invert_cond(cond);
} else if (negopc) {
if (tv == -1 && fv == 0) {
op->opc = negopc;
op->args[3] = cond;
} else if (fv == -1 && tv == 0) {
op->opc = negopc;
op->args[3] = tcg_invert_cond(cond);
}
}
}
return false;
}
static bool fold_mul(OptContext *ctx, TCGOp *op)
{
if (fold_const2(ctx, op) ||
fold_xi_to_i(ctx, op, 0) ||
fold_xi_to_x(ctx, op, 1)) {
return true;
}
return false;
}
static bool fold_mul_highpart(OptContext *ctx, TCGOp *op)
{
if (fold_const2_commutative(ctx, op) ||
fold_xi_to_i(ctx, op, 0)) {
return true;
}
return false;
}
static bool fold_multiply2(OptContext *ctx, TCGOp *op)
{
swap_commutative(op->args[0], &op->args[2], &op->args[3]);
if (arg_is_const(op->args[2]) && arg_is_const(op->args[3])) {
uint64_t a = arg_info(op->args[2])->val;
uint64_t b = arg_info(op->args[3])->val;
uint64_t h, l;
TCGArg rl, rh;
TCGOp *op2;
switch (op->opc) {
case INDEX_op_mulu2_i32:
l = (uint64_t)(uint32_t)a * (uint32_t)b;
h = (int32_t)(l >> 32);
l = (int32_t)l;
break;
case INDEX_op_muls2_i32:
l = (int64_t)(int32_t)a * (int32_t)b;
h = l >> 32;
l = (int32_t)l;
break;
case INDEX_op_mulu2_i64:
mulu64(&l, &h, a, b);
break;
case INDEX_op_muls2_i64:
muls64(&l, &h, a, b);
break;
default:
g_assert_not_reached();
}
rl = op->args[0];
rh = op->args[1];
/* The proper opcode is supplied by tcg_opt_gen_mov. */
op2 = tcg_op_insert_before(ctx->tcg, op, 0, 2);
tcg_opt_gen_movi(ctx, op, rl, l);
tcg_opt_gen_movi(ctx, op2, rh, h);
return true;
}
return false;
}
static bool fold_nand(OptContext *ctx, TCGOp *op)
{
if (fold_const2_commutative(ctx, op) ||
fold_xi_to_not(ctx, op, -1)) {
return true;
}
ctx->s_mask = arg_info(op->args[1])->s_mask
& arg_info(op->args[2])->s_mask;
return false;
}
static bool fold_neg_no_const(OptContext *ctx, TCGOp *op)
{
/* Set to 1 all bits to the left of the rightmost. */
uint64_t z_mask = arg_info(op->args[1])->z_mask;
ctx->z_mask = -(z_mask & -z_mask);
/*
* Because of fold_sub_to_neg, we want to always return true,
* via finish_folding.
*/
finish_folding(ctx, op);
return true;
}
static bool fold_neg(OptContext *ctx, TCGOp *op)
{
return fold_const1(ctx, op) || fold_neg_no_const(ctx, op);
}
static bool fold_nor(OptContext *ctx, TCGOp *op)
{
if (fold_const2_commutative(ctx, op) ||
fold_xi_to_not(ctx, op, 0)) {
return true;
}
ctx->s_mask = arg_info(op->args[1])->s_mask
& arg_info(op->args[2])->s_mask;
return false;
}
static bool fold_not(OptContext *ctx, TCGOp *op)
{
if (fold_const1(ctx, op)) {
return true;
}
ctx->s_mask = arg_info(op->args[1])->s_mask;
/* Because of fold_to_not, we want to always return true, via finish. */
finish_folding(ctx, op);
return true;
}
static bool fold_or(OptContext *ctx, TCGOp *op)
{
if (fold_const2_commutative(ctx, op) ||
fold_xi_to_x(ctx, op, 0) ||
fold_xx_to_x(ctx, op)) {
return true;
}
ctx->z_mask = arg_info(op->args[1])->z_mask
| arg_info(op->args[2])->z_mask;
ctx->s_mask = arg_info(op->args[1])->s_mask
& arg_info(op->args[2])->s_mask;
return fold_masks(ctx, op);
}
static bool fold_orc(OptContext *ctx, TCGOp *op)
{
if (fold_const2(ctx, op) ||
fold_xx_to_i(ctx, op, -1) ||
fold_xi_to_x(ctx, op, -1) ||
fold_ix_to_not(ctx, op, 0)) {
return true;
}
ctx->s_mask = arg_info(op->args[1])->s_mask
& arg_info(op->args[2])->s_mask;
return false;
}
static bool fold_qemu_ld(OptContext *ctx, TCGOp *op)
{
const TCGOpDef *def = &tcg_op_defs[op->opc];
MemOpIdx oi = op->args[def->nb_oargs + def->nb_iargs];
MemOp mop = get_memop(oi);
int width = 8 * memop_size(mop);
if (width < 64) {
ctx->s_mask = MAKE_64BIT_MASK(width, 64 - width);
if (!(mop & MO_SIGN)) {
ctx->z_mask = MAKE_64BIT_MASK(0, width);
ctx->s_mask <<= 1;
}
}
/* Opcodes that touch guest memory stop the mb optimization. */
ctx->prev_mb = NULL;
return false;
}
static bool fold_qemu_st(OptContext *ctx, TCGOp *op)
{
/* Opcodes that touch guest memory stop the mb optimization. */
ctx->prev_mb = NULL;
return false;
}
static bool fold_remainder(OptContext *ctx, TCGOp *op)
{
if (fold_const2(ctx, op) ||
fold_xx_to_i(ctx, op, 0)) {
return true;
}
return false;
}
static bool fold_setcond_zmask(OptContext *ctx, TCGOp *op, bool neg)
{
uint64_t a_zmask, b_val;
TCGCond cond;
if (!arg_is_const(op->args[2])) {
return false;
}
a_zmask = arg_info(op->args[1])->z_mask;
b_val = arg_info(op->args[2])->val;
cond = op->args[3];
if (ctx->type == TCG_TYPE_I32) {
a_zmask = (uint32_t)a_zmask;
b_val = (uint32_t)b_val;
}
/*
* A with only low bits set vs B with high bits set means that A < B.
*/
if (a_zmask < b_val) {
bool inv = false;
switch (cond) {
case TCG_COND_NE:
case TCG_COND_LEU:
case TCG_COND_LTU:
inv = true;
/* fall through */
case TCG_COND_GTU:
case TCG_COND_GEU:
case TCG_COND_EQ:
return tcg_opt_gen_movi(ctx, op, op->args[0], neg ? -inv : inv);
default:
break;
}
}
/*
* A with only lsb set is already boolean.
*/
if (a_zmask <= 1) {
bool convert = false;
bool inv = false;
switch (cond) {
case TCG_COND_EQ:
inv = true;
/* fall through */
case TCG_COND_NE:
convert = (b_val == 0);
break;
case TCG_COND_LTU:
case TCG_COND_TSTEQ:
inv = true;
/* fall through */
case TCG_COND_GEU:
case TCG_COND_TSTNE:
convert = (b_val == 1);
break;
default:
break;
}
if (convert) {
TCGOpcode add_opc, xor_opc, neg_opc;
if (!inv && !neg) {
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]);
}
switch (ctx->type) {
case TCG_TYPE_I32:
add_opc = INDEX_op_add_i32;
neg_opc = INDEX_op_neg_i32;
xor_opc = INDEX_op_xor_i32;
break;
case TCG_TYPE_I64:
add_opc = INDEX_op_add_i64;
neg_opc = INDEX_op_neg_i64;
xor_opc = INDEX_op_xor_i64;
break;
default:
g_assert_not_reached();
}
if (!inv) {
op->opc = neg_opc;
} else if (neg) {
op->opc = add_opc;
op->args[2] = arg_new_constant(ctx, -1);
} else {
op->opc = xor_opc;
op->args[2] = arg_new_constant(ctx, 1);
}
return false;
}
}
return false;
}
static void fold_setcond_tst_pow2(OptContext *ctx, TCGOp *op, bool neg)
{
TCGOpcode and_opc, sub_opc, xor_opc, neg_opc, shr_opc;
TCGOpcode uext_opc = 0, sext_opc = 0;
TCGCond cond = op->args[3];
TCGArg ret, src1, src2;
TCGOp *op2;
uint64_t val;
int sh;
bool inv;
if (!is_tst_cond(cond) || !arg_is_const(op->args[2])) {
return;
}
src2 = op->args[2];
val = arg_info(src2)->val;
if (!is_power_of_2(val)) {
return;
}
sh = ctz64(val);
switch (ctx->type) {
case TCG_TYPE_I32:
and_opc = INDEX_op_and_i32;
sub_opc = INDEX_op_sub_i32;
xor_opc = INDEX_op_xor_i32;
shr_opc = INDEX_op_shr_i32;
neg_opc = INDEX_op_neg_i32;
if (TCG_TARGET_extract_i32_valid(sh, 1)) {
uext_opc = TCG_TARGET_HAS_extract_i32 ? INDEX_op_extract_i32 : 0;
sext_opc = TCG_TARGET_HAS_sextract_i32 ? INDEX_op_sextract_i32 : 0;
}
break;
case TCG_TYPE_I64:
and_opc = INDEX_op_and_i64;
sub_opc = INDEX_op_sub_i64;
xor_opc = INDEX_op_xor_i64;
shr_opc = INDEX_op_shr_i64;
neg_opc = INDEX_op_neg_i64;
if (TCG_TARGET_extract_i64_valid(sh, 1)) {
uext_opc = TCG_TARGET_HAS_extract_i64 ? INDEX_op_extract_i64 : 0;
sext_opc = TCG_TARGET_HAS_sextract_i64 ? INDEX_op_sextract_i64 : 0;
}
break;
default:
g_assert_not_reached();
}
ret = op->args[0];
src1 = op->args[1];
inv = cond == TCG_COND_TSTEQ;
if (sh && sext_opc && neg && !inv) {
op->opc = sext_opc;
op->args[1] = src1;
op->args[2] = sh;
op->args[3] = 1;
return;
} else if (sh && uext_opc) {
op->opc = uext_opc;
op->args[1] = src1;
op->args[2] = sh;
op->args[3] = 1;
} else {
if (sh) {
op2 = tcg_op_insert_before(ctx->tcg, op, shr_opc, 3);
op2->args[0] = ret;
op2->args[1] = src1;
op2->args[2] = arg_new_constant(ctx, sh);
src1 = ret;
}
op->opc = and_opc;
op->args[1] = src1;
op->args[2] = arg_new_constant(ctx, 1);
}
if (neg && inv) {
op2 = tcg_op_insert_after(ctx->tcg, op, sub_opc, 3);
op2->args[0] = ret;
op2->args[1] = ret;
op2->args[2] = arg_new_constant(ctx, 1);
} else if (inv) {
op2 = tcg_op_insert_after(ctx->tcg, op, xor_opc, 3);
op2->args[0] = ret;
op2->args[1] = ret;
op2->args[2] = arg_new_constant(ctx, 1);
} else if (neg) {
op2 = tcg_op_insert_after(ctx->tcg, op, neg_opc, 2);
op2->args[0] = ret;
op2->args[1] = ret;
}
}
static bool fold_setcond(OptContext *ctx, TCGOp *op)
{
int i = do_constant_folding_cond1(ctx, op, op->args[0], &op->args[1],
&op->args[2], &op->args[3]);
if (i >= 0) {
return tcg_opt_gen_movi(ctx, op, op->args[0], i);
}
if (fold_setcond_zmask(ctx, op, false)) {
return true;
}
fold_setcond_tst_pow2(ctx, op, false);
ctx->z_mask = 1;
ctx->s_mask = smask_from_zmask(1);
return false;
}
static bool fold_negsetcond(OptContext *ctx, TCGOp *op)
{
int i = do_constant_folding_cond1(ctx, op, op->args[0], &op->args[1],
&op->args[2], &op->args[3]);
if (i >= 0) {
return tcg_opt_gen_movi(ctx, op, op->args[0], -i);
}
if (fold_setcond_zmask(ctx, op, true)) {
return true;
}
fold_setcond_tst_pow2(ctx, op, true);
/* Value is {0,-1} so all bits are repetitions of the sign. */
ctx->s_mask = -1;
return false;
}
static bool fold_setcond2(OptContext *ctx, TCGOp *op)
{
TCGCond cond;
int i, inv = 0;
i = do_constant_folding_cond2(ctx, op, &op->args[1]);
cond = op->args[5];
if (i >= 0) {
goto do_setcond_const;
}
switch (cond) {
case TCG_COND_LT:
case TCG_COND_GE:
/*
* Simplify LT/GE comparisons vs zero to a single compare
* vs the high word of the input.
*/
if (arg_is_const_val(op->args[3], 0) &&
arg_is_const_val(op->args[4], 0)) {
goto do_setcond_high;
}
break;
case TCG_COND_NE:
inv = 1;
QEMU_FALLTHROUGH;
case TCG_COND_EQ:
/*
* Simplify EQ/NE comparisons where one of the pairs
* can be simplified.
*/
i = do_constant_folding_cond(TCG_TYPE_I32, op->args[1],
op->args[3], cond);
switch (i ^ inv) {
case 0:
goto do_setcond_const;
case 1:
goto do_setcond_high;
}
i = do_constant_folding_cond(TCG_TYPE_I32, op->args[2],
op->args[4], cond);
switch (i ^ inv) {
case 0:
goto do_setcond_const;
case 1:
goto do_setcond_low;
}
break;
case TCG_COND_TSTEQ:
case TCG_COND_TSTNE:
if (arg_is_const_val(op->args[3], 0)) {
goto do_setcond_high;
}
if (arg_is_const_val(op->args[4], 0)) {
goto do_setcond_low;
}
break;
default:
break;
do_setcond_low:
op->args[2] = op->args[3];
op->args[3] = cond;
op->opc = INDEX_op_setcond_i32;
return fold_setcond(ctx, op);
do_setcond_high:
op->args[1] = op->args[2];
op->args[2] = op->args[4];
op->args[3] = cond;
op->opc = INDEX_op_setcond_i32;
return fold_setcond(ctx, op);
}
ctx->z_mask = 1;
ctx->s_mask = smask_from_zmask(1);
return false;
do_setcond_const:
return tcg_opt_gen_movi(ctx, op, op->args[0], i);
}
static bool fold_cmp_vec(OptContext *ctx, TCGOp *op)
{
/* Canonicalize the comparison to put immediate second. */
if (swap_commutative(NO_DEST, &op->args[1], &op->args[2])) {
op->args[3] = tcg_swap_cond(op->args[3]);
}
return false;
}
static bool fold_cmpsel_vec(OptContext *ctx, TCGOp *op)
{
/* If true and false values are the same, eliminate the cmp. */
if (args_are_copies(op->args[3], op->args[4])) {
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[3]);
}
/* Canonicalize the comparison to put immediate second. */
if (swap_commutative(NO_DEST, &op->args[1], &op->args[2])) {
op->args[5] = tcg_swap_cond(op->args[5]);
}
/*
* Canonicalize the "false" input reg to match the destination,
* so that the tcg backend can implement "move if true".
*/
if (swap_commutative(op->args[0], &op->args[4], &op->args[3])) {
op->args[5] = tcg_invert_cond(op->args[5]);
}
return false;
}
static bool fold_sextract(OptContext *ctx, TCGOp *op)
{
uint64_t z_mask, s_mask, s_mask_old;
int pos = op->args[2];
int len = op->args[3];
if (arg_is_const(op->args[1])) {
uint64_t t;
t = arg_info(op->args[1])->val;
t = sextract64(t, pos, len);
return tcg_opt_gen_movi(ctx, op, op->args[0], t);
}
z_mask = arg_info(op->args[1])->z_mask;
z_mask = sextract64(z_mask, pos, len);
ctx->z_mask = z_mask;
s_mask_old = arg_info(op->args[1])->s_mask;
s_mask = sextract64(s_mask_old, pos, len);
s_mask |= MAKE_64BIT_MASK(len, 64 - len);
ctx->s_mask = s_mask;
if (pos == 0) {
ctx->a_mask = s_mask & ~s_mask_old;
}
return fold_masks(ctx, op);
}
static bool fold_shift(OptContext *ctx, TCGOp *op)
{
uint64_t s_mask, z_mask, sign;
if (fold_const2(ctx, op) ||
fold_ix_to_i(ctx, op, 0) ||
fold_xi_to_x(ctx, op, 0)) {
return true;
}
s_mask = arg_info(op->args[1])->s_mask;
z_mask = arg_info(op->args[1])->z_mask;
if (arg_is_const(op->args[2])) {
int sh = arg_info(op->args[2])->val;
ctx->z_mask = do_constant_folding(op->opc, ctx->type, z_mask, sh);
s_mask = do_constant_folding(op->opc, ctx->type, s_mask, sh);
ctx->s_mask = smask_from_smask(s_mask);
return fold_masks(ctx, op);
}
switch (op->opc) {
CASE_OP_32_64(sar):
/*
* Arithmetic right shift will not reduce the number of
* input sign repetitions.
*/
ctx->s_mask = s_mask;
break;
CASE_OP_32_64(shr):
/*
* If the sign bit is known zero, then logical right shift
* will not reduced the number of input sign repetitions.
*/
sign = (s_mask & -s_mask) >> 1;
if (sign && !(z_mask & sign)) {
ctx->s_mask = s_mask;
}
break;
default:
break;
}
return false;
}
static bool fold_sub_to_neg(OptContext *ctx, TCGOp *op)
{
TCGOpcode neg_op;
bool have_neg;
if (!arg_is_const(op->args[1]) || arg_info(op->args[1])->val != 0) {
return false;
}
switch (ctx->type) {
case TCG_TYPE_I32:
neg_op = INDEX_op_neg_i32;
have_neg = true;
break;
case TCG_TYPE_I64:
neg_op = INDEX_op_neg_i64;
have_neg = true;
break;
case TCG_TYPE_V64:
case TCG_TYPE_V128:
case TCG_TYPE_V256:
neg_op = INDEX_op_neg_vec;
have_neg = (TCG_TARGET_HAS_neg_vec &&
tcg_can_emit_vec_op(neg_op, ctx->type, TCGOP_VECE(op)) > 0);
break;
default:
g_assert_not_reached();
}
if (have_neg) {
op->opc = neg_op;
op->args[1] = op->args[2];
return fold_neg_no_const(ctx, op);
}
return false;
}
/* We cannot as yet do_constant_folding with vectors. */
static bool fold_sub_vec(OptContext *ctx, TCGOp *op)
{
if (fold_xx_to_i(ctx, op, 0) ||
fold_xi_to_x(ctx, op, 0) ||
fold_sub_to_neg(ctx, op)) {
return true;
}
return false;
}
static bool fold_sub(OptContext *ctx, TCGOp *op)
{
if (fold_const2(ctx, op) || fold_sub_vec(ctx, op)) {
return true;
}
/* Fold sub r,x,i to add r,x,-i */
if (arg_is_const(op->args[2])) {
uint64_t val = arg_info(op->args[2])->val;
op->opc = (ctx->type == TCG_TYPE_I32
? INDEX_op_add_i32 : INDEX_op_add_i64);
op->args[2] = arg_new_constant(ctx, -val);
}
return false;
}
static bool fold_sub2(OptContext *ctx, TCGOp *op)
{
return fold_addsub2(ctx, op, false);
}
static bool fold_tcg_ld(OptContext *ctx, TCGOp *op)
{
/* We can't do any folding with a load, but we can record bits. */
switch (op->opc) {
CASE_OP_32_64(ld8s):
ctx->s_mask = MAKE_64BIT_MASK(8, 56);
break;
CASE_OP_32_64(ld8u):
ctx->z_mask = MAKE_64BIT_MASK(0, 8);
ctx->s_mask = MAKE_64BIT_MASK(9, 55);
break;
CASE_OP_32_64(ld16s):
ctx->s_mask = MAKE_64BIT_MASK(16, 48);
break;
CASE_OP_32_64(ld16u):
ctx->z_mask = MAKE_64BIT_MASK(0, 16);
ctx->s_mask = MAKE_64BIT_MASK(17, 47);
break;
case INDEX_op_ld32s_i64:
ctx->s_mask = MAKE_64BIT_MASK(32, 32);
break;
case INDEX_op_ld32u_i64:
ctx->z_mask = MAKE_64BIT_MASK(0, 32);
ctx->s_mask = MAKE_64BIT_MASK(33, 31);
break;
default:
g_assert_not_reached();
}
return false;
}
static bool fold_tcg_ld_memcopy(OptContext *ctx, TCGOp *op)
{
TCGTemp *dst, *src;
intptr_t ofs;
TCGType type;
if (op->args[1] != tcgv_ptr_arg(tcg_env)) {
return false;
}
type = ctx->type;
ofs = op->args[2];
dst = arg_temp(op->args[0]);
src = find_mem_copy_for(ctx, type, ofs);
if (src && src->base_type == type) {
return tcg_opt_gen_mov(ctx, op, temp_arg(dst), temp_arg(src));
}
reset_ts(ctx, dst);
record_mem_copy(ctx, type, dst, ofs, ofs + tcg_type_size(type) - 1);
return true;
}
static bool fold_tcg_st(OptContext *ctx, TCGOp *op)
{
intptr_t ofs = op->args[2];
intptr_t lm1;
if (op->args[1] != tcgv_ptr_arg(tcg_env)) {
remove_mem_copy_all(ctx);
return false;
}
switch (op->opc) {
CASE_OP_32_64(st8):
lm1 = 0;
break;
CASE_OP_32_64(st16):
lm1 = 1;
break;
case INDEX_op_st32_i64:
case INDEX_op_st_i32:
lm1 = 3;
break;
case INDEX_op_st_i64:
lm1 = 7;
break;
case INDEX_op_st_vec:
lm1 = tcg_type_size(ctx->type) - 1;
break;
default:
g_assert_not_reached();
}
remove_mem_copy_in(ctx, ofs, ofs + lm1);
return false;
}
static bool fold_tcg_st_memcopy(OptContext *ctx, TCGOp *op)
{
TCGTemp *src;
intptr_t ofs, last;
TCGType type;
if (op->args[1] != tcgv_ptr_arg(tcg_env)) {
fold_tcg_st(ctx, op);
return false;
}
src = arg_temp(op->args[0]);
ofs = op->args[2];
type = ctx->type;
/*
* Eliminate duplicate stores of a constant.
* This happens frequently when the target ISA zero-extends.
*/
if (ts_is_const(src)) {
TCGTemp *prev = find_mem_copy_for(ctx, type, ofs);
if (src == prev) {
tcg_op_remove(ctx->tcg, op);
return true;
}
}
last = ofs + tcg_type_size(type) - 1;
remove_mem_copy_in(ctx, ofs, last);
record_mem_copy(ctx, type, src, ofs, last);
return false;
}
static bool fold_xor(OptContext *ctx, TCGOp *op)
{
if (fold_const2_commutative(ctx, op) ||
fold_xx_to_i(ctx, op, 0) ||
fold_xi_to_x(ctx, op, 0) ||
fold_xi_to_not(ctx, op, -1)) {
return true;
}
ctx->z_mask = arg_info(op->args[1])->z_mask
| arg_info(op->args[2])->z_mask;
ctx->s_mask = arg_info(op->args[1])->s_mask
& arg_info(op->args[2])->s_mask;
return fold_masks(ctx, op);
}
static bool fold_bitsel_vec(OptContext *ctx, TCGOp *op)
{
/* If true and false values are the same, eliminate the cmp. */
if (args_are_copies(op->args[2], op->args[3])) {
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[2]);
}
if (arg_is_const(op->args[2]) && arg_is_const(op->args[3])) {
uint64_t tv = arg_info(op->args[2])->val;
uint64_t fv = arg_info(op->args[3])->val;
if (tv == -1 && fv == 0) {
return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]);
}
if (tv == 0 && fv == -1) {
if (TCG_TARGET_HAS_not_vec) {
op->opc = INDEX_op_not_vec;
return fold_not(ctx, op);
} else {
op->opc = INDEX_op_xor_vec;
op->args[2] = arg_new_constant(ctx, -1);
return fold_xor(ctx, op);
}
}
}
if (arg_is_const(op->args[2])) {
uint64_t tv = arg_info(op->args[2])->val;
if (tv == -1) {
op->opc = INDEX_op_or_vec;
op->args[2] = op->args[3];
return fold_or(ctx, op);
}
if (tv == 0 && TCG_TARGET_HAS_andc_vec) {
op->opc = INDEX_op_andc_vec;
op->args[2] = op->args[1];
op->args[1] = op->args[3];
return fold_andc(ctx, op);
}
}
if (arg_is_const(op->args[3])) {
uint64_t fv = arg_info(op->args[3])->val;
if (fv == 0) {
op->opc = INDEX_op_and_vec;
return fold_and(ctx, op);
}
if (fv == -1 && TCG_TARGET_HAS_orc_vec) {
op->opc = INDEX_op_orc_vec;
op->args[2] = op->args[1];
op->args[1] = op->args[3];
return fold_orc(ctx, op);
}
}
return false;
}
/* Propagate constants and copies, fold constant expressions. */
void tcg_optimize(TCGContext *s)
{
int nb_temps, i;
TCGOp *op, *op_next;
OptContext ctx = { .tcg = s };
QSIMPLEQ_INIT(&ctx.mem_free);
/* Array VALS has an element for each temp.
If this temp holds a constant then its value is kept in VALS' element.
If this temp is a copy of other ones then the other copies are
available through the doubly linked circular list. */
nb_temps = s->nb_temps;
for (i = 0; i < nb_temps; ++i) {
s->temps[i].state_ptr = NULL;
}
QTAILQ_FOREACH_SAFE(op, &s->ops, link, op_next) {
TCGOpcode opc = op->opc;
const TCGOpDef *def;
bool done = false;
/* Calls are special. */
if (opc == INDEX_op_call) {
fold_call(&ctx, op);
continue;
}
def = &tcg_op_defs[opc];
init_arguments(&ctx, op, def->nb_oargs + def->nb_iargs);
copy_propagate(&ctx, op, def->nb_oargs, def->nb_iargs);
/* Pre-compute the type of the operation. */
if (def->flags & TCG_OPF_VECTOR) {
ctx.type = TCG_TYPE_V64 + TCGOP_VECL(op);
} else if (def->flags & TCG_OPF_64BIT) {
ctx.type = TCG_TYPE_I64;
} else {
ctx.type = TCG_TYPE_I32;
}
/* Assume all bits affected, no bits known zero, no sign reps. */
ctx.a_mask = -1;
ctx.z_mask = -1;
ctx.s_mask = 0;
/*
* Process each opcode.
* Sorted alphabetically by opcode as much as possible.
*/
switch (opc) {
CASE_OP_32_64(add):
done = fold_add(&ctx, op);
break;
case INDEX_op_add_vec:
done = fold_add_vec(&ctx, op);
break;
CASE_OP_32_64(add2):
done = fold_add2(&ctx, op);
break;
CASE_OP_32_64_VEC(and):
done = fold_and(&ctx, op);
break;
CASE_OP_32_64_VEC(andc):
done = fold_andc(&ctx, op);
break;
CASE_OP_32_64(brcond):
done = fold_brcond(&ctx, op);
break;
case INDEX_op_brcond2_i32:
done = fold_brcond2(&ctx, op);
break;
CASE_OP_32_64(bswap16):
CASE_OP_32_64(bswap32):
case INDEX_op_bswap64_i64:
done = fold_bswap(&ctx, op);
break;
CASE_OP_32_64(clz):
CASE_OP_32_64(ctz):
done = fold_count_zeros(&ctx, op);
break;
CASE_OP_32_64(ctpop):
done = fold_ctpop(&ctx, op);
break;
CASE_OP_32_64(deposit):
done = fold_deposit(&ctx, op);
break;
CASE_OP_32_64(div):
CASE_OP_32_64(divu):
done = fold_divide(&ctx, op);
break;
case INDEX_op_dup_vec:
done = fold_dup(&ctx, op);
break;
case INDEX_op_dup2_vec:
done = fold_dup2(&ctx, op);
break;
CASE_OP_32_64_VEC(eqv):
done = fold_eqv(&ctx, op);
break;
CASE_OP_32_64(extract):
done = fold_extract(&ctx, op);
break;
CASE_OP_32_64(extract2):
done = fold_extract2(&ctx, op);
break;
CASE_OP_32_64(ext8s):
CASE_OP_32_64(ext16s):
case INDEX_op_ext32s_i64:
case INDEX_op_ext_i32_i64:
done = fold_exts(&ctx, op);
break;
CASE_OP_32_64(ext8u):
CASE_OP_32_64(ext16u):
case INDEX_op_ext32u_i64:
case INDEX_op_extu_i32_i64:
case INDEX_op_extrl_i64_i32:
case INDEX_op_extrh_i64_i32:
done = fold_extu(&ctx, op);
break;
CASE_OP_32_64(ld8s):
CASE_OP_32_64(ld8u):
CASE_OP_32_64(ld16s):
CASE_OP_32_64(ld16u):
case INDEX_op_ld32s_i64:
case INDEX_op_ld32u_i64:
done = fold_tcg_ld(&ctx, op);
break;
case INDEX_op_ld_i32:
case INDEX_op_ld_i64:
case INDEX_op_ld_vec:
done = fold_tcg_ld_memcopy(&ctx, op);
break;
CASE_OP_32_64(st8):
CASE_OP_32_64(st16):
case INDEX_op_st32_i64:
done = fold_tcg_st(&ctx, op);
break;
case INDEX_op_st_i32:
case INDEX_op_st_i64:
case INDEX_op_st_vec:
done = fold_tcg_st_memcopy(&ctx, op);
break;
case INDEX_op_mb:
done = fold_mb(&ctx, op);
break;
CASE_OP_32_64_VEC(mov):
done = fold_mov(&ctx, op);
break;
CASE_OP_32_64(movcond):
done = fold_movcond(&ctx, op);
break;
CASE_OP_32_64(mul):
done = fold_mul(&ctx, op);
break;
CASE_OP_32_64(mulsh):
CASE_OP_32_64(muluh):
done = fold_mul_highpart(&ctx, op);
break;
CASE_OP_32_64(muls2):
CASE_OP_32_64(mulu2):
done = fold_multiply2(&ctx, op);
break;
CASE_OP_32_64_VEC(nand):
done = fold_nand(&ctx, op);
break;
CASE_OP_32_64(neg):
done = fold_neg(&ctx, op);
break;
CASE_OP_32_64_VEC(nor):
done = fold_nor(&ctx, op);
break;
CASE_OP_32_64_VEC(not):
done = fold_not(&ctx, op);
break;
CASE_OP_32_64_VEC(or):
done = fold_or(&ctx, op);
break;
CASE_OP_32_64_VEC(orc):
done = fold_orc(&ctx, op);
break;
case INDEX_op_qemu_ld_a32_i32:
case INDEX_op_qemu_ld_a64_i32:
case INDEX_op_qemu_ld_a32_i64:
case INDEX_op_qemu_ld_a64_i64:
case INDEX_op_qemu_ld_a32_i128:
case INDEX_op_qemu_ld_a64_i128:
done = fold_qemu_ld(&ctx, op);
break;
case INDEX_op_qemu_st8_a32_i32:
case INDEX_op_qemu_st8_a64_i32:
case INDEX_op_qemu_st_a32_i32:
case INDEX_op_qemu_st_a64_i32:
case INDEX_op_qemu_st_a32_i64:
case INDEX_op_qemu_st_a64_i64:
case INDEX_op_qemu_st_a32_i128:
case INDEX_op_qemu_st_a64_i128:
done = fold_qemu_st(&ctx, op);
break;
CASE_OP_32_64(rem):
CASE_OP_32_64(remu):
done = fold_remainder(&ctx, op);
break;
CASE_OP_32_64(rotl):
CASE_OP_32_64(rotr):
CASE_OP_32_64(sar):
CASE_OP_32_64(shl):
CASE_OP_32_64(shr):
done = fold_shift(&ctx, op);
break;
CASE_OP_32_64(setcond):
done = fold_setcond(&ctx, op);
break;
CASE_OP_32_64(negsetcond):
done = fold_negsetcond(&ctx, op);
break;
case INDEX_op_setcond2_i32:
done = fold_setcond2(&ctx, op);
break;
case INDEX_op_cmp_vec:
done = fold_cmp_vec(&ctx, op);
break;
case INDEX_op_cmpsel_vec:
done = fold_cmpsel_vec(&ctx, op);
break;
case INDEX_op_bitsel_vec:
done = fold_bitsel_vec(&ctx, op);
break;
CASE_OP_32_64(sextract):
done = fold_sextract(&ctx, op);
break;
CASE_OP_32_64(sub):
done = fold_sub(&ctx, op);
break;
case INDEX_op_sub_vec:
done = fold_sub_vec(&ctx, op);
break;
CASE_OP_32_64(sub2):
done = fold_sub2(&ctx, op);
break;
CASE_OP_32_64_VEC(xor):
done = fold_xor(&ctx, op);
break;
default:
break;
}
if (!done) {
finish_folding(&ctx, op);
}
}
}
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