tcg: Make call address a constant parameter
Avoid allocating a tcg temporary to hold the constant address, and instead place it directly into the op_call arguments. At the same time, convert to the newly introduced tcg_out_call backend function, rather than invoking tcg_out_op for the call. Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
parent
dddbb2e1e3
commit
cf06667428
@ -513,12 +513,8 @@ static bool swap_commutative2(TCGArg *p1, TCGArg *p2)
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static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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TCGArg *args, TCGOpDef *tcg_op_defs)
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{
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int i, nb_ops, op_index, nb_temps, nb_globals, nb_call_args;
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tcg_target_ulong mask, affected;
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TCGOpcode op;
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const TCGOpDef *def;
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int nb_ops, op_index, nb_temps, nb_globals;
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TCGArg *gen_args;
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TCGArg tmp;
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/* Array VALS has an element for each temp.
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If this temp holds a constant then its value is kept in VALS' element.
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@ -532,24 +528,29 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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nb_ops = tcg_opc_ptr - s->gen_opc_buf;
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gen_args = args;
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for (op_index = 0; op_index < nb_ops; op_index++) {
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op = s->gen_opc_buf[op_index];
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def = &tcg_op_defs[op];
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/* Do copy propagation */
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TCGOpcode op = s->gen_opc_buf[op_index];
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const TCGOpDef *def = &tcg_op_defs[op];
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tcg_target_ulong mask, affected;
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int nb_oargs, nb_iargs, nb_args, i;
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TCGArg tmp;
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if (op == INDEX_op_call) {
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int nb_oargs = args[0] >> 16;
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int nb_iargs = args[0] & 0xffff;
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for (i = nb_oargs + 1; i < nb_oargs + nb_iargs + 1; i++) {
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if (temps[args[i]].state == TCG_TEMP_COPY) {
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args[i] = find_better_copy(s, args[i]);
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}
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}
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*gen_args++ = tmp = *args++;
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nb_oargs = tmp >> 16;
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nb_iargs = tmp & 0xffff;
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nb_args = nb_oargs + nb_iargs + def->nb_cargs;
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} else {
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for (i = def->nb_oargs; i < def->nb_oargs + def->nb_iargs; i++) {
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nb_oargs = def->nb_oargs;
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nb_iargs = def->nb_iargs;
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nb_args = def->nb_args;
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}
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/* Do copy propagation */
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for (i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
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if (temps[args[i]].state == TCG_TEMP_COPY) {
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args[i] = find_better_copy(s, args[i]);
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}
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}
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}
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/* For commutative operations make constant second argument */
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switch (op) {
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@ -882,7 +883,7 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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CASE_OP_32_64(qemu_ld):
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{
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TCGMemOp mop = args[def->nb_oargs + def->nb_iargs];
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TCGMemOp mop = args[nb_oargs + nb_iargs];
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if (!(mop & MO_SIGN)) {
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mask = (2ULL << ((8 << (mop & MO_SIZE)) - 1)) - 1;
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}
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@ -900,15 +901,15 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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}
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if (mask == 0) {
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assert(def->nb_oargs == 1);
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assert(nb_oargs == 1);
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s->gen_opc_buf[op_index] = op_to_movi(op);
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tcg_opt_gen_movi(gen_args, args[0], 0);
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args += def->nb_oargs + def->nb_iargs + def->nb_cargs;
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args += nb_args;
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gen_args += 2;
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continue;
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}
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if (affected == 0) {
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assert(def->nb_oargs == 1);
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assert(nb_oargs == 1);
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if (temps_are_copies(args[0], args[1])) {
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s->gen_opc_buf[op_index] = INDEX_op_nop;
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} else if (temps[args[1]].state != TCG_TEMP_CONST) {
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@ -920,7 +921,7 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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tcg_opt_gen_movi(gen_args, args[0], temps[args[1]].val);
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gen_args += 2;
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}
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args += def->nb_iargs + 1;
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args += nb_args;
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continue;
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}
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@ -1246,24 +1247,13 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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break;
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case INDEX_op_call:
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nb_call_args = (args[0] >> 16) + (args[0] & 0xffff);
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if (!(args[nb_call_args + 1] & (TCG_CALL_NO_READ_GLOBALS |
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TCG_CALL_NO_WRITE_GLOBALS))) {
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if (!(args[nb_oargs + nb_iargs + 1]
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& (TCG_CALL_NO_READ_GLOBALS | TCG_CALL_NO_WRITE_GLOBALS))) {
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for (i = 0; i < nb_globals; i++) {
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reset_temp(i);
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}
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}
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for (i = 0; i < (args[0] >> 16); i++) {
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reset_temp(args[i + 1]);
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}
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i = nb_call_args + 3;
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while (i) {
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*gen_args = *args;
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args++;
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gen_args++;
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i--;
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}
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break;
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goto do_reset_output;
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default:
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do_default:
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@ -1275,7 +1265,8 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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if (def->flags & TCG_OPF_BB_END) {
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reset_all_temps(nb_temps);
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} else {
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for (i = 0; i < def->nb_oargs; i++) {
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do_reset_output:
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for (i = 0; i < nb_oargs; i++) {
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reset_temp(args[i]);
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/* Save the corresponding known-zero bits mask for the
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first output argument (only one supported so far). */
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@ -1284,11 +1275,11 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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}
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}
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}
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for (i = 0; i < def->nb_args; i++) {
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for (i = 0; i < nb_args; i++) {
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gen_args[i] = args[i];
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}
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args += def->nb_args;
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gen_args += def->nb_args;
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args += nb_args;
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gen_args += nb_args;
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break;
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}
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}
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16
tcg/tcg-op.h
16
tcg/tcg-op.h
@ -390,11 +390,7 @@ static inline int tcg_gen_sizemask(int n, int is_64bit, int is_signed)
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static inline void tcg_gen_helperN(void *func, int flags, int sizemask,
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TCGArg ret, int nargs, TCGArg *args)
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{
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TCGv_ptr fn;
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fn = tcg_const_ptr(func);
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tcg_gen_callN(&tcg_ctx, fn, flags, sizemask, ret,
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nargs, args);
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tcg_temp_free_ptr(fn);
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tcg_gen_callN(&tcg_ctx, func, flags, sizemask, ret, nargs, args);
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}
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/* Note: Both tcg_gen_helper32() and tcg_gen_helper64() are currently
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@ -405,29 +401,23 @@ static inline void tcg_gen_helperN(void *func, int flags, int sizemask,
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static inline void tcg_gen_helper32(void *func, int sizemask, TCGv_i32 ret,
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TCGv_i32 a, TCGv_i32 b)
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{
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TCGv_ptr fn;
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TCGArg args[2];
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fn = tcg_const_ptr(func);
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args[0] = GET_TCGV_I32(a);
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args[1] = GET_TCGV_I32(b);
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tcg_gen_callN(&tcg_ctx, fn,
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tcg_gen_callN(&tcg_ctx, func,
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TCG_CALL_NO_READ_GLOBALS | TCG_CALL_NO_SIDE_EFFECTS,
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sizemask, GET_TCGV_I32(ret), 2, args);
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tcg_temp_free_ptr(fn);
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}
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static inline void tcg_gen_helper64(void *func, int sizemask, TCGv_i64 ret,
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TCGv_i64 a, TCGv_i64 b)
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{
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TCGv_ptr fn;
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TCGArg args[2];
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fn = tcg_const_ptr(func);
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args[0] = GET_TCGV_I64(a);
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args[1] = GET_TCGV_I64(b);
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tcg_gen_callN(&tcg_ctx, fn,
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tcg_gen_callN(&tcg_ctx, func,
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TCG_CALL_NO_READ_GLOBALS | TCG_CALL_NO_SIDE_EFFECTS,
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sizemask, GET_TCGV_I64(ret), 2, args);
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tcg_temp_free_ptr(fn);
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}
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/* 32 bit ops */
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@ -40,7 +40,7 @@ DEF(discard, 1, 0, 0, TCG_OPF_NOT_PRESENT)
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DEF(set_label, 0, 0, 1, TCG_OPF_BB_END | TCG_OPF_NOT_PRESENT)
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/* variable number of parameters */
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DEF(call, 0, 1, 2, TCG_OPF_CALL_CLOBBER)
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DEF(call, 0, 0, 3, TCG_OPF_CALL_CLOBBER)
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DEF(br, 0, 0, 1, TCG_OPF_BB_END)
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tcg/tcg.c
129
tcg/tcg.c
@ -101,6 +101,7 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
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const int *const_args);
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static void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg, TCGReg arg1,
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intptr_t arg2);
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static void tcg_out_call(TCGContext *s, tcg_insn_unit *target);
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static int tcg_target_const_match(tcg_target_long val, TCGType type,
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const TCGArgConstraint *arg_ct);
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static void tcg_out_tb_init(TCGContext *s);
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@ -705,7 +706,7 @@ int tcg_check_temp_count(void)
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/* Note: we convert the 64 bit args to 32 bit and do some alignment
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and endian swap. Maybe it would be better to do the alignment
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and endian swap in tcg_reg_alloc_call(). */
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void tcg_gen_callN(TCGContext *s, TCGv_ptr func, unsigned int flags,
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void tcg_gen_callN(TCGContext *s, void *func, unsigned int flags,
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int sizemask, TCGArg ret, int nargs, TCGArg *args)
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{
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int i;
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@ -832,11 +833,10 @@ void tcg_gen_callN(TCGContext *s, TCGv_ptr func, unsigned int flags,
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*s->gen_opparam_ptr++ = args[i];
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real_args++;
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}
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*s->gen_opparam_ptr++ = GET_TCGV_PTR(func);
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*s->gen_opparam_ptr++ = (uintptr_t)func;
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*s->gen_opparam_ptr++ = flags;
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*nparam = (nb_rets << 16) | (real_args + 1);
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*nparam = (nb_rets << 16) | real_args;
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/* total parameters, needed to go backward in the instruction stream */
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*s->gen_opparam_ptr++ = 1 + nb_rets + real_args + 3;
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@ -1243,49 +1243,21 @@ void tcg_dump_ops(TCGContext *s)
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nb_iargs = arg & 0xffff;
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nb_cargs = def->nb_cargs;
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qemu_log(" %s ", def->name);
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/* function name */
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qemu_log("%s",
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tcg_get_arg_str_idx(s, buf, sizeof(buf),
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args[nb_oargs + nb_iargs - 1]));
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/* flags */
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qemu_log(",$0x%" TCG_PRIlx, args[nb_oargs + nb_iargs]);
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/* nb out args */
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qemu_log(",$%d", nb_oargs);
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for(i = 0; i < nb_oargs; i++) {
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qemu_log(",");
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qemu_log("%s", tcg_get_arg_str_idx(s, buf, sizeof(buf),
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/* function name, flags, out args */
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qemu_log(" %s %s,$0x%" TCG_PRIlx ",$%d", def->name,
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tcg_find_helper(s, args[nb_oargs + nb_iargs]),
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args[nb_oargs + nb_iargs + 1], nb_oargs);
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for (i = 0; i < nb_oargs; i++) {
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qemu_log(",%s", tcg_get_arg_str_idx(s, buf, sizeof(buf),
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args[i]));
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}
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for(i = 0; i < (nb_iargs - 1); i++) {
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qemu_log(",");
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if (args[nb_oargs + i] == TCG_CALL_DUMMY_ARG) {
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qemu_log("<dummy>");
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} else {
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qemu_log("%s", tcg_get_arg_str_idx(s, buf, sizeof(buf),
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args[nb_oargs + i]));
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}
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}
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} else if (c == INDEX_op_movi_i32 || c == INDEX_op_movi_i64) {
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tcg_target_ulong val;
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const char *name;
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nb_oargs = def->nb_oargs;
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nb_iargs = def->nb_iargs;
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nb_cargs = def->nb_cargs;
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qemu_log(" %s %s,$", def->name,
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tcg_get_arg_str_idx(s, buf, sizeof(buf), args[0]));
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val = args[1];
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name = tcg_find_helper(s, val);
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if (name) {
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qemu_log("%s", name);
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} else {
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if (c == INDEX_op_movi_i32) {
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qemu_log("0x%x", (uint32_t)val);
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} else {
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qemu_log("0x%" PRIx64 , (uint64_t)val);
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for (i = 0; i < nb_iargs; i++) {
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TCGArg arg = args[nb_oargs + i];
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const char *t = "<dummy>";
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if (arg != TCG_CALL_DUMMY_ARG) {
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t = tcg_get_arg_str_idx(s, buf, sizeof(buf), arg);
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}
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qemu_log(",%s", t);
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}
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} else {
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qemu_log(" %s ", def->name);
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@ -1548,9 +1520,9 @@ static inline void tcg_la_bb_end(TCGContext *s, uint8_t *dead_temps,
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temporaries are removed. */
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static void tcg_liveness_analysis(TCGContext *s)
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{
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int i, op_index, nb_args, nb_iargs, nb_oargs, arg, nb_ops;
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int i, op_index, nb_args, nb_iargs, nb_oargs, nb_ops;
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TCGOpcode op, op_new, op_new2;
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TCGArg *args;
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TCGArg *args, arg;
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const TCGOpDef *def;
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uint8_t *dead_temps, *mem_temps;
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uint16_t dead_args;
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@ -1580,15 +1552,15 @@ static void tcg_liveness_analysis(TCGContext *s)
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nb_args = args[-1];
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args -= nb_args;
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nb_iargs = args[0] & 0xffff;
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nb_oargs = args[0] >> 16;
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args++;
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call_flags = args[nb_oargs + nb_iargs];
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arg = *args++;
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nb_iargs = arg & 0xffff;
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nb_oargs = arg >> 16;
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call_flags = args[nb_oargs + nb_iargs + 1];
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/* pure functions can be removed if their result is not
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used */
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if (call_flags & TCG_CALL_NO_SIDE_EFFECTS) {
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for(i = 0; i < nb_oargs; i++) {
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for (i = 0; i < nb_oargs; i++) {
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arg = args[i];
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if (!dead_temps[arg] || mem_temps[arg]) {
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goto do_not_remove_call;
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@ -1602,7 +1574,7 @@ static void tcg_liveness_analysis(TCGContext *s)
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/* output args are dead */
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dead_args = 0;
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sync_args = 0;
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for(i = 0; i < nb_oargs; i++) {
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for (i = 0; i < nb_oargs; i++) {
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arg = args[i];
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if (dead_temps[arg]) {
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dead_args |= (1 << i);
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@ -1625,7 +1597,7 @@ static void tcg_liveness_analysis(TCGContext *s)
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}
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/* input args are live */
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for(i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
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for (i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
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arg = args[i];
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if (arg != TCG_CALL_DUMMY_ARG) {
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if (dead_temps[arg]) {
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@ -2372,26 +2344,27 @@ static int tcg_reg_alloc_call(TCGContext *s, const TCGOpDef *def,
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uint16_t dead_args, uint8_t sync_args)
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{
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int nb_iargs, nb_oargs, flags, nb_regs, i, reg, nb_params;
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TCGArg arg, func_arg;
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TCGArg arg;
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TCGTemp *ts;
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intptr_t stack_offset;
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size_t call_stack_size;
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uintptr_t func_addr;
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int const_func_arg, allocate_args;
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tcg_insn_unit *func_addr;
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int allocate_args;
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TCGRegSet allocated_regs;
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const TCGArgConstraint *arg_ct;
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arg = *args++;
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nb_oargs = arg >> 16;
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nb_iargs = arg & 0xffff;
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nb_params = nb_iargs - 1;
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nb_params = nb_iargs;
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flags = args[nb_oargs + nb_iargs];
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func_addr = (tcg_insn_unit *)(intptr_t)args[nb_oargs + nb_iargs];
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flags = args[nb_oargs + nb_iargs + 1];
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nb_regs = ARRAY_SIZE(tcg_target_call_iarg_regs);
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if (nb_regs > nb_params)
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if (nb_regs > nb_params) {
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nb_regs = nb_params;
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||||
}
|
||||
|
||||
/* assign stack slots first */
|
||||
call_stack_size = (nb_params - nb_regs) * sizeof(tcg_target_long);
|
||||
@ -2459,40 +2432,6 @@ static int tcg_reg_alloc_call(TCGContext *s, const TCGOpDef *def,
|
||||
}
|
||||
}
|
||||
|
||||
/* assign function address */
|
||||
func_arg = args[nb_oargs + nb_iargs - 1];
|
||||
arg_ct = &def->args_ct[0];
|
||||
ts = &s->temps[func_arg];
|
||||
func_addr = ts->val;
|
||||
const_func_arg = 0;
|
||||
if (ts->val_type == TEMP_VAL_MEM) {
|
||||
reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs);
|
||||
tcg_out_ld(s, ts->type, reg, ts->mem_reg, ts->mem_offset);
|
||||
func_arg = reg;
|
||||
tcg_regset_set_reg(allocated_regs, reg);
|
||||
} else if (ts->val_type == TEMP_VAL_REG) {
|
||||
reg = ts->reg;
|
||||
if (!tcg_regset_test_reg(arg_ct->u.regs, reg)) {
|
||||
reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs);
|
||||
tcg_out_mov(s, ts->type, reg, ts->reg);
|
||||
}
|
||||
func_arg = reg;
|
||||
tcg_regset_set_reg(allocated_regs, reg);
|
||||
} else if (ts->val_type == TEMP_VAL_CONST) {
|
||||
if (tcg_target_const_match(func_addr, ts->type, arg_ct)) {
|
||||
const_func_arg = 1;
|
||||
func_arg = func_addr;
|
||||
} else {
|
||||
reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs);
|
||||
tcg_out_movi(s, ts->type, reg, func_addr);
|
||||
func_arg = reg;
|
||||
tcg_regset_set_reg(allocated_regs, reg);
|
||||
}
|
||||
} else {
|
||||
tcg_abort();
|
||||
}
|
||||
|
||||
|
||||
/* mark dead temporaries and free the associated registers */
|
||||
for(i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
|
||||
if (IS_DEAD_ARG(i)) {
|
||||
@ -2517,7 +2456,7 @@ static int tcg_reg_alloc_call(TCGContext *s, const TCGOpDef *def,
|
||||
save_globals(s, allocated_regs);
|
||||
}
|
||||
|
||||
tcg_out_op(s, opc, &func_arg, &const_func_arg);
|
||||
tcg_out_call(s, func_addr);
|
||||
|
||||
/* assign output registers and emit moves if needed */
|
||||
for(i = 0; i < nb_oargs; i++) {
|
||||
|
@ -725,7 +725,7 @@ void tcg_add_target_add_op_defs(const TCGTargetOpDef *tdefs);
|
||||
#define tcg_temp_free_ptr(T) tcg_temp_free_i64(TCGV_PTR_TO_NAT(T))
|
||||
#endif
|
||||
|
||||
void tcg_gen_callN(TCGContext *s, TCGv_ptr func, unsigned int flags,
|
||||
void tcg_gen_callN(TCGContext *s, void *func, unsigned int flags,
|
||||
int sizemask, TCGArg ret, int nargs, TCGArg *args);
|
||||
|
||||
void tcg_gen_shifti_i64(TCGv_i64 ret, TCGv_i64 arg1,
|
||||
|
Loading…
Reference in New Issue
Block a user