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NetBSD/gnu/usr.bin/gcc/common/bc-optab.c
phil 34527405c3 Import gcc-2.7.2. Since it is in the gcc directory instead of the gcc2 
directory, this is being done now.  We will live with two trees until
the "formal" switch over by changing src/gnu/usr.bin/Makefile.
1995-12-01 17:58:53 +00:00

790 lines
22 KiB
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/* Bytecode conversion definitions for GNU C-compiler.
Copyright (C) 1993, 1994 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "config.h"
#include "tree.h"
#include "rtl.h"
#include "machmode.h"
#include "obstack.h"
#include "bytecode.h"
#include "bc-typecd.h"
#include "bc-opcode.h"
#include "bc-optab.h"
#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free
extern char *xmalloc ();
extern void free ();
/* Table relating interpreter typecodes to machine modes. */
#define GET_TYPECODE_MODE(CODE) (typecode_mode[((int) CODE)])
enum machine_mode typecode_mode[] = {
#define DEFTYPECODE(CODE, NAME, MODE, TYPE) MODE,
#include "bc-typecd.def"
#undef DEFTYPECODE
};
/* Machine mode to type code map */
static enum typecode signed_mode_to_code_map[MAX_MACHINE_MODE+1];
static enum typecode unsigned_mode_to_code_map[MAX_MACHINE_MODE+1];
#define GET_TYPECODE_SIZE(CODE) GET_MODE_SIZE (GET_TYPECODE_MODE (CODE))
#define BIG_ARBITRARY_NUMBER 100000
/* Table of recipes for conversions among scalar types, to be filled
in as needed at run time. */
static struct conversion_recipe
{
unsigned char *opcodes; /* Bytecodes to emit in order. */
int nopcodes; /* Count of bytecodes. */
int cost; /* A rather arbitrary cost function. */
} conversion_recipe[NUM_TYPECODES][NUM_TYPECODES];
/* Binary operator tables. */
struct binary_operator optab_plus_expr[] = {
{ addSI, SIcode, SIcode, SIcode },
{ addDI, DIcode, DIcode, DIcode },
{ addSF, SFcode, SFcode, SFcode },
{ addDF, DFcode, DFcode, DFcode },
{ addXF, XFcode, XFcode, XFcode },
{ addPSI, Pcode, Pcode, SIcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_minus_expr[] = {
{ subSI, SIcode, SIcode, SIcode },
{ subDI, DIcode, DIcode, DIcode },
{ subSF, SFcode, SFcode, SFcode },
{ subDF, DFcode, DFcode, DFcode },
{ subXF, XFcode, XFcode, XFcode },
{ subPP, SIcode, Pcode, Pcode },
{ -1, -1, -1, -1 },
};
/* The ordering of the tables for multiplicative operators
is such that unsigned operations will be preferred to signed
operations when one argument is unsigned. */
struct binary_operator optab_mult_expr[] = {
{ mulSU, SUcode, SUcode, SUcode },
{ mulDU, DUcode, DUcode, DUcode },
{ mulSI, SIcode, SIcode, SIcode },
{ mulDI, DIcode, DIcode, DIcode },
{ mulSF, SFcode, SFcode, SFcode },
{ mulDF, DFcode, DFcode, DFcode },
{ mulXF, XFcode, XFcode, XFcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_trunc_div_expr[] = {
{ divSU, SUcode, SUcode, SUcode },
{ divDU, DUcode, DUcode, DUcode },
{ divSI, SIcode, SIcode, SIcode },
{ divDI, DIcode, DIcode, DIcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_trunc_mod_expr[] = {
{ modSU, SUcode, SUcode, SUcode },
{ modDU, DUcode, DUcode, DUcode },
{ modSI, SIcode, SIcode, SIcode },
{ modDI, DIcode, DIcode, DIcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_rdiv_expr[] = {
{ divSF, SFcode, SFcode, SFcode },
{ divDF, DFcode, DFcode, DFcode },
{ divXF, XFcode, XFcode, XFcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_bit_and_expr[] = {
{ andSI, SIcode, SIcode, SIcode },
{ andDI, DIcode, DIcode, DIcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_bit_ior_expr[] = {
{ iorSI, SIcode, SIcode, SIcode },
{ iorDI, DIcode, DIcode, DIcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_bit_xor_expr[] = {
{ xorSI, SIcode, SIcode, SIcode },
{ xorDI, DIcode, DIcode, DIcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_lshift_expr[] = {
{ lshiftSI, SIcode, SIcode, SIcode },
{ lshiftSU, SUcode, SUcode, SIcode },
{ lshiftDI, DIcode, DIcode, SIcode },
{ lshiftDU, DUcode, DUcode, SIcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_rshift_expr[] = {
{ rshiftSI, SIcode, SIcode, SIcode },
{ rshiftSU, SUcode, SUcode, SIcode },
{ rshiftDI, DIcode, DIcode, SIcode },
{ rshiftDU, DUcode, DUcode, SIcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_truth_and_expr[] = {
{ andSI, SIcode, Tcode, Tcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_truth_or_expr[] = {
{ iorSI, SIcode, Tcode, Tcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_lt_expr[] = {
{ ltSI, Tcode, SIcode, SIcode },
{ ltSU, Tcode, SUcode, SUcode },
{ ltDI, Tcode, DIcode, DIcode },
{ ltDU, Tcode, DUcode, DUcode },
{ ltSF, Tcode, SFcode, SFcode },
{ ltDF, Tcode, DFcode, DFcode },
{ ltXF, Tcode, XFcode, XFcode },
{ ltP, Tcode, Pcode, Pcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_le_expr[] = {
{ leSI, Tcode, SIcode, SIcode },
{ leSU, Tcode, SUcode, SUcode },
{ leDI, Tcode, DIcode, DIcode },
{ leDU, Tcode, DUcode, DUcode },
{ leSF, Tcode, SFcode, SFcode },
{ leDF, Tcode, DFcode, DFcode },
{ leXF, Tcode, XFcode, XFcode },
{ leP, Tcode, Pcode, Pcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_ge_expr[] = {
{ geSI, Tcode, SIcode, SIcode },
{ geSU, Tcode, SUcode, SUcode },
{ geDI, Tcode, DIcode, DIcode },
{ geDU, Tcode, DUcode, DUcode },
{ geSF, Tcode, SFcode, SFcode },
{ geDF, Tcode, DFcode, DFcode },
{ geXF, Tcode, XFcode, XFcode },
{ geP, Tcode, Pcode, Pcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_gt_expr[] = {
{ gtSI, Tcode, SIcode, SIcode },
{ gtSU, Tcode, SUcode, SUcode },
{ gtDI, Tcode, DIcode, DIcode },
{ gtDU, Tcode, DUcode, DUcode },
{ gtSF, Tcode, SFcode, SFcode },
{ gtDF, Tcode, DFcode, DFcode },
{ gtXF, Tcode, XFcode, XFcode },
{ gtP, Tcode, Pcode, Pcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_eq_expr[] = {
{ eqSI, Tcode, SIcode, SIcode },
{ eqDI, Tcode, DIcode, DIcode },
{ eqSF, Tcode, SFcode, SFcode },
{ eqDF, Tcode, DFcode, DFcode },
{ eqXF, Tcode, XFcode, XFcode },
{ eqP, Tcode, Pcode, Pcode },
{ -1, -1, -1, -1 },
};
struct binary_operator optab_ne_expr[] = {
{ neSI, Tcode, SIcode, SIcode },
{ neDI, Tcode, DIcode, DIcode },
{ neSF, Tcode, SFcode, SFcode },
{ neDF, Tcode, DFcode, DFcode },
{ neXF, Tcode, XFcode, XFcode },
{ neP, Tcode, Pcode, Pcode },
{ -1, -1, -1, -1 },
};
/* Unary operator tables. */
struct unary_operator optab_negate_expr[] = {
{ negSI, SIcode, SIcode },
{ negDI, DIcode, DIcode },
{ negSF, SFcode, SFcode },
{ negDF, DFcode, DFcode },
{ negXF, XFcode, XFcode },
{ -1, -1, -1 },
};
struct unary_operator optab_bit_not_expr[] = {
{ notSI, SIcode, SIcode },
{ notDI, DIcode, DIcode },
{ -1, -1, -1 },
};
struct unary_operator optab_truth_not_expr[] = {
{ notT, SIcode, SIcode },
{ -1, -1, -1 },
};
/* Increment operator tables. */
struct increment_operator optab_predecrement_expr[] = {
{ predecQI, QIcode },
{ predecQI, QUcode },
{ predecHI, HIcode },
{ predecHI, HUcode },
{ predecSI, SIcode },
{ predecSI, SUcode },
{ predecDI, DIcode },
{ predecDI, DUcode },
{ predecP, Pcode },
{ predecSF, SFcode },
{ predecDF, DFcode },
{ predecXF, XFcode },
{ -1, -1 },
};
struct increment_operator optab_preincrement_expr[] = {
{ preincQI, QIcode },
{ preincQI, QUcode },
{ preincHI, HIcode },
{ preincHI, HUcode },
{ preincSI, SIcode },
{ preincSI, SUcode },
{ preincDI, DIcode },
{ preincDI, DUcode },
{ preincP, Pcode },
{ preincSF, SFcode },
{ preincDF, DFcode },
{ preincXF, XFcode },
{ -1, -1 },
};
struct increment_operator optab_postdecrement_expr[] = {
{ postdecQI, QIcode },
{ postdecQI, QUcode },
{ postdecHI, HIcode },
{ postdecHI, HUcode },
{ postdecSI, SIcode },
{ postdecSI, SUcode },
{ postdecDI, DIcode },
{ postdecDI, DUcode },
{ postdecP, Pcode },
{ postdecSF, SFcode },
{ postdecDF, DFcode },
{ postdecXF, XFcode },
{ -1, -1 },
};
struct increment_operator optab_postincrement_expr[] = {
{ postincQI, QIcode },
{ postincQI, QUcode },
{ postincHI, HIcode },
{ postincHI, HUcode },
{ postincSI, SIcode },
{ postincSI, SUcode },
{ postincDI, DIcode },
{ postincDI, DUcode },
{ postincP, Pcode },
{ postincSF, SFcode },
{ postincDF, DFcode },
{ postincXF, XFcode },
{ -1, -1 },
};
/* Table of conversions supported by the interpreter. */
static struct conversion_info
{
enum bytecode_opcode opcode; /* here indicates the conversion needs no opcode. */
enum typecode from;
enum typecode to;
int cost; /* 1 for no-op conversions, 2 for widening conversions,
4 for int/float conversions, 8 for narrowing conversions. */
} conversion_info[] = {
{ -1, QIcode, QUcode, 1 },
{ -1, HIcode, HUcode, 1 },
{ -1, SIcode, SUcode, 1 },
{ -1, DIcode, DUcode, 1 },
{ -1, QUcode, QIcode, 1 },
{ -1, HUcode, HIcode, 1 },
{ -1, SUcode, SIcode, 1 },
{ -1, DUcode, DIcode, 1 },
{ -1, Tcode, SIcode, 1 },
{ convertQIHI, QIcode, HIcode, 2 },
{ convertQUHU, QUcode, HUcode, 2 },
{ convertQUSU, QUcode, SUcode, 2 },
{ convertHISI, HIcode, SIcode, 2 },
{ convertHUSU, HUcode, SUcode, 2 },
{ convertSIDI, SIcode, DIcode, 2 },
{ convertSUDU, SUcode, DUcode, 2 },
{ convertSFDF, SFcode, DFcode, 2 },
{ convertDFXF, DFcode, XFcode, 2 },
{ convertHIQI, HIcode, QIcode, 8 },
{ convertSIQI, SIcode, QIcode, 8 },
{ convertSIHI, SIcode, HIcode, 8 },
{ convertSUQU, SUcode, QUcode, 8 },
{ convertDISI, DIcode, SIcode, 8 },
{ convertDFSF, DFcode, SFcode, 8 },
{ convertXFDF, XFcode, DFcode, 8 },
{ convertPSI, Pcode, SIcode, 2 },
{ convertSIP, SIcode, Pcode, 2 },
{ convertSIT, SIcode, Tcode, 2 },
{ convertDIT, DIcode, Tcode, 2 },
{ convertSFT, SFcode, Tcode, 2 },
{ convertDFT, DFcode, Tcode, 2 },
{ convertXFT, XFcode, Tcode, 2 },
{ convertQISI, QIcode, SIcode, 2 },
{ convertPT, Pcode, Tcode, 2 },
{ convertSISF, SIcode, SFcode, 4 },
{ convertSIDF, SIcode, DFcode, 4 },
{ convertSIXF, SIcode, XFcode, 4 },
{ convertSUSF, SUcode, SFcode, 4 },
{ convertSUDF, SUcode, DFcode, 4 },
{ convertSUXF, SUcode, XFcode, 4 },
{ convertDISF, DIcode, SFcode, 4 },
{ convertDIDF, DIcode, DFcode, 4 },
{ convertDIXF, DIcode, XFcode, 4 },
{ convertDUSF, DUcode, SFcode, 4 },
{ convertDUDF, DUcode, DFcode, 4 },
{ convertDUXF, DUcode, XFcode, 4 },
{ convertSFSI, SFcode, SIcode, 4 },
{ convertDFSI, DFcode, SIcode, 4 },
{ convertXFSI, XFcode, SIcode, 4 },
{ convertSFSU, SFcode, SUcode, 4 },
{ convertDFSU, DFcode, SUcode, 4 },
{ convertXFSU, XFcode, SUcode, 4 },
{ convertSFDI, SFcode, DIcode, 4 },
{ convertDFDI, DFcode, DIcode, 4 },
{ convertXFDI, XFcode, DIcode, 4 },
{ convertSFDU, SFcode, DUcode, 4 },
{ convertDFDU, DFcode, DUcode, 4 },
{ convertXFDU, XFcode, DUcode, 4 },
{ convertSIQI, SIcode, QIcode, 8 },
};
#define NUM_CONVERSIONS (sizeof conversion_info / sizeof (struct conversion_info))
/* List form of a conversion recipe. */
struct conversion_list
{
enum bytecode_opcode opcode;
enum typecode to;
int cost;
struct conversion_list *prev;
};
/* Determine if it is "reasonable" to add a given conversion to
a given list of conversions. The following criteria define
"reasonable" conversion lists:
* No typecode appears more than once in the sequence (no loops).
* At most one conversion from integer to float or vice versa is present.
* Either sign extensions or zero extensions may be present, but not both.
* No widening conversions occur after a signed/unsigned conversion.
* The sequence of sizes must be strict nonincreasing or nondecreasing. */
static int
conversion_reasonable_p (conversion, list)
struct conversion_info *conversion;
struct conversion_list *list;
{
struct conversion_list *curr;
int curr_size, prev_size;
int has_int_float, has_float_int;
int has_sign_extend, has_zero_extend;
int has_signed_unsigned, has_unsigned_signed;
has_int_float = 0;
has_float_int = 0;
has_sign_extend = 0;
has_zero_extend = 0;
has_signed_unsigned = 0;
has_unsigned_signed = 0;
/* Make sure the destination typecode doesn't already appear in
the list. */
for (curr = list; curr; curr = curr->prev)
if (conversion->to == curr->to)
return 0;
/* Check for certain kinds of conversions. */
if (TYPECODE_INTEGER_P (conversion->from)
&& TYPECODE_FLOAT_P (conversion->to))
has_int_float = 1;
if (TYPECODE_FLOAT_P (conversion->from)
&& TYPECODE_INTEGER_P (conversion->to))
has_float_int = 1;
if (TYPECODE_SIGNED_P (conversion->from)
&& TYPECODE_SIGNED_P (conversion->to)
&& GET_TYPECODE_SIZE (conversion->from)
< GET_TYPECODE_SIZE (conversion->to))
has_sign_extend = 1;
if (TYPECODE_UNSIGNED_P (conversion->from)
&& TYPECODE_UNSIGNED_P (conversion->to)
&& GET_TYPECODE_SIZE (conversion->from)
< GET_TYPECODE_SIZE (conversion->to))
has_zero_extend = 1;
for (curr = list; curr && curr->prev; curr = curr->prev)
{
if (TYPECODE_INTEGER_P (curr->prev->to)
&& TYPECODE_FLOAT_P (curr->to))
has_int_float = 1;
if (TYPECODE_FLOAT_P (curr->prev->to)
&& TYPECODE_INTEGER_P (curr->to))
has_float_int = 1;
if (TYPECODE_SIGNED_P (curr->prev->to)
&& TYPECODE_SIGNED_P (curr->to)
&& GET_TYPECODE_SIZE (curr->prev->to)
< GET_TYPECODE_SIZE (curr->to))
has_sign_extend = 1;
if (TYPECODE_UNSIGNED_P (curr->prev->to)
&& TYPECODE_UNSIGNED_P (curr->to)
&& GET_TYPECODE_SIZE (curr->prev->to)
< GET_TYPECODE_SIZE (curr->to))
has_zero_extend = 1;
if (TYPECODE_SIGNED_P (curr->prev->to)
&& TYPECODE_UNSIGNED_P (curr->to))
has_signed_unsigned = 1;
if (TYPECODE_UNSIGNED_P (curr->prev->to)
&& TYPECODE_SIGNED_P (curr->to))
has_unsigned_signed = 1;
}
if (TYPECODE_INTEGER_P (conversion->from)
&& TYPECODE_INTEGER_P (conversion->to)
&& GET_TYPECODE_SIZE (conversion->to)
> GET_TYPECODE_SIZE (conversion->from)
&& (has_signed_unsigned || has_unsigned_signed))
return 0;
if (has_float_int && has_int_float || has_sign_extend && has_zero_extend)
return 0;
/* Make sure the sequence of destination typecode sizes is
strictly nondecreasing or strictly nonincreasing. */
prev_size = GET_TYPECODE_SIZE (conversion->to);
for (curr = list; curr; curr = curr->prev)
{
curr_size = GET_TYPECODE_SIZE (curr->to);
if (curr_size != prev_size)
break;
}
if (!curr)
return 1;
if (curr_size < prev_size)
for (prev_size = curr_size; curr; curr = curr->prev)
{
curr_size = GET_TYPECODE_SIZE (curr->to);
if (curr_size > prev_size)
return 0;
prev_size = curr_size;
}
else
for (prev_size = curr_size; curr; curr = curr->prev)
{
curr_size = GET_TYPECODE_SIZE (curr->to);
if (curr_size < prev_size)
return 0;
prev_size = curr_size;
}
return 1;
}
/* Exhaustively search all reasonable conversions to find one to
convert the given types. */
static struct conversion_recipe
deduce_conversion (from, to)
enum typecode from, to;
{
struct rl
{
struct conversion_list *list;
struct rl *next;
} *prev, curr, *good, *temp;
struct conversion_list *conv, *best;
int i, cost, bestcost;
struct conversion_recipe result;
struct obstack recipe_obstack;
obstack_init (&recipe_obstack);
curr.next = (struct rl *) obstack_alloc (&recipe_obstack, sizeof (struct rl));
curr.next->list =
(struct conversion_list *) obstack_alloc (&recipe_obstack,
sizeof (struct conversion_list));
curr.next->list->opcode = -1;
curr.next->list->to = from;
curr.next->list->cost = 0;
curr.next->list->prev = 0;
curr.next->next = 0;
good = 0;
while (curr.next)
{
/* Remove successful conversions from further consideration. */
for (prev = &curr; prev; prev = prev->next)
if (prev->next && prev->next->list->to == to)
{
temp = prev->next->next;
prev->next->next = good;
good = prev->next;
prev->next = temp;
}
/* Go through each of the pending conversion chains, trying
all possible candidate conversions on them. */
for (prev = curr.next, curr.next = 0; prev; prev = prev->next)
for (i = 0; i < NUM_CONVERSIONS; ++i)
if (conversion_info[i].from == prev->list->to
&& conversion_reasonable_p (&conversion_info[i], prev->list))
{
temp = (struct rl *) obstack_alloc (&recipe_obstack,
sizeof (struct rl));
temp->list = (struct conversion_list *)
obstack_alloc (&recipe_obstack,
sizeof (struct conversion_list));
temp->list->opcode = conversion_info[i].opcode;
temp->list->to = conversion_info[i].to;
temp->list->cost = conversion_info[i].cost;
temp->list->prev = prev->list;
temp->next = curr.next;
curr.next = temp;
}
}
bestcost = BIG_ARBITRARY_NUMBER;
best = 0;
for (temp = good; temp; temp = temp->next)
{
for (conv = temp->list, cost = 0; conv; conv = conv->prev)
cost += conv->cost;
if (cost < bestcost)
{
bestcost = cost;
best = temp->list;
}
}
if (!best)
abort ();
for (i = 0, conv = best; conv; conv = conv->prev)
if (conv->opcode != -1)
++i;
result.opcodes = (unsigned char *) xmalloc (i);
result.nopcodes = i;
for (conv = best; conv; conv = conv->prev)
if (conv->opcode != -1)
result.opcodes[--i] = conv->opcode;
result.cost = bestcost;
obstack_free (&recipe_obstack, 0);
return result;
}
#define DEDUCE_CONVERSION(FROM, TO) \
(conversion_recipe[(int) FROM][(int) TO].opcodes ? 0 \
: (conversion_recipe[(int) FROM][(int) TO] \
= deduce_conversion (FROM, TO), 0))
/* Emit a conversion between the given scalar types. */
void
emit_typecode_conversion (from, to)
enum typecode from, to;
{
int i;
DEDUCE_CONVERSION (from, to);
for (i = 0; i < conversion_recipe[(int) from][(int) to].nopcodes; ++i)
bc_emit_instruction (conversion_recipe[(int) from][(int) to].opcodes[i]);
}
/* Initialize mode_to_code_map[] */
void
bc_init_mode_to_code_map ()
{
int mode;
for (mode = 0; mode < MAX_MACHINE_MODE + 1; mode++)
{
signed_mode_to_code_map[mode] =
unsigned_mode_to_code_map[mode] =
LAST_AND_UNUSED_TYPECODE;
}
#define DEF_MODEMAP(SYM, CODE, UCODE, CONST, LOAD, STORE) \
{ signed_mode_to_code_map[(int) SYM] = CODE; \
unsigned_mode_to_code_map[(int) SYM] = UCODE; }
#include "modemap.def"
#undef DEF_MODEMAP
/* Initialize opcode maps for const, load, and store */
bc_init_mode_to_opcode_maps ();
}
/* Given a machine mode return the preferred typecode. */
enum typecode
preferred_typecode (mode, unsignedp)
enum machine_mode mode;
int unsignedp;
{
enum typecode code = (unsignedp
? unsigned_mode_to_code_map
: signed_mode_to_code_map) [MIN ((int) mode,
(int) MAX_MACHINE_MODE)];
if (code == LAST_AND_UNUSED_TYPECODE)
abort ();
return code;
}
/* Expand a conversion between the given types. */
void
bc_expand_conversion (from, to)
tree from, to;
{
enum typecode fcode, tcode;
fcode = preferred_typecode (TYPE_MODE (from), TREE_UNSIGNED (from));
tcode = preferred_typecode (TYPE_MODE (to), TREE_UNSIGNED (to));
emit_typecode_conversion (fcode, tcode);
}
/* Expand a conversion of the given type to a truth value. */
void
bc_expand_truth_conversion (from)
tree from;
{
enum typecode fcode;
fcode = preferred_typecode (TYPE_MODE (from), TREE_UNSIGNED (from));
emit_typecode_conversion (fcode, Tcode);
}
/* Emit an appropriate binary operation. */
void
bc_expand_binary_operation (optab, resulttype, arg0, arg1)
struct binary_operator optab[];
tree resulttype, arg0, arg1;
{
int i, besti, cost, bestcost;
enum typecode resultcode, arg0code, arg1code;
resultcode = preferred_typecode (TYPE_MODE (resulttype), TREE_UNSIGNED (resulttype));
arg0code = preferred_typecode (TYPE_MODE (TREE_TYPE (arg0)), TREE_UNSIGNED (resulttype));
arg1code = preferred_typecode (TYPE_MODE (TREE_TYPE (arg1)), TREE_UNSIGNED (resulttype));
besti = -1;
bestcost = BIG_ARBITRARY_NUMBER;
for (i = 0; optab[i].opcode != -1; ++i)
{
cost = 0;
DEDUCE_CONVERSION (arg0code, optab[i].arg0);
cost += conversion_recipe[(int) arg0code][(int) optab[i].arg0].cost;
DEDUCE_CONVERSION (arg1code, optab[i].arg1);
cost += conversion_recipe[(int) arg1code][(int) optab[i].arg1].cost;
if (cost < bestcost)
{
besti = i;
bestcost = cost;
}
}
if (besti == -1)
abort ();
expand_expr (arg1, 0, VOIDmode, 0);
emit_typecode_conversion (arg1code, optab[besti].arg1);
expand_expr (arg0, 0, VOIDmode, 0);
emit_typecode_conversion (arg0code, optab[besti].arg0);
bc_emit_instruction (optab[besti].opcode);
emit_typecode_conversion (optab[besti].result, resultcode);
}
/* Emit an appropriate unary operation. */
void
bc_expand_unary_operation (optab, resulttype, arg0)
struct unary_operator optab[];
tree resulttype, arg0;
{
int i, besti, cost, bestcost;
enum typecode resultcode, arg0code;
resultcode = preferred_typecode (TYPE_MODE (resulttype), TREE_UNSIGNED (resulttype));
arg0code = preferred_typecode (TYPE_MODE (TREE_TYPE (arg0)), TREE_UNSIGNED (TREE_TYPE (arg0)));
besti = -1;
bestcost = BIG_ARBITRARY_NUMBER;
for (i = 0; optab[i].opcode != -1; ++i)
{
DEDUCE_CONVERSION (arg0code, optab[i].arg0);
cost = conversion_recipe[(int) arg0code][(int) optab[i].arg0].cost;
if (cost < bestcost)
{
besti = i;
bestcost = cost;
}
}
if (besti == -1)
abort ();
expand_expr (arg0, 0, VOIDmode, 0);
emit_typecode_conversion (arg0code, optab[besti].arg0);
bc_emit_instruction (optab[besti].opcode);
emit_typecode_conversion (optab[besti].result, resultcode);
}
/* Emit an appropriate increment. */
void
bc_expand_increment (optab, type)
struct increment_operator optab[];
tree type;
{
enum typecode code;
int i;
code = preferred_typecode (TYPE_MODE (type), TREE_UNSIGNED (type));
for (i = 0; (int) optab[i].opcode >= 0; ++i)
if (code == optab[i].arg)
{
bc_emit_instruction (optab[i].opcode);
return;
}
abort ();
}
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