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tcg-i386: Implement setcond. 

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Richard Henderson 2009-12-19 10:46:38 -08:00 committed by Aurelien Jarno
parent f75b56c1ec
commit 1d2699ae5a
1 changed files with 70 additions and 3 deletions
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73
tcg/i386/tcg-target.c
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@ -361,9 +361,8 @@ static void tcg_out_jxx(TCGContext *s, int opc, int label_index, int small)
}
}
static void tcg_out_brcond(TCGContext *s, int cond,
TCGArg arg1, TCGArg arg2, int const_arg2,
int label_index, int small)
static void tcg_out_cmp(TCGContext *s, TCGArg arg1, TCGArg arg2,
int const_arg2)
{
if (const_arg2) {
if (arg2 == 0) {
@ -375,6 +374,13 @@ static void tcg_out_brcond(TCGContext *s, int cond,
} else {
tcg_out_modrm(s, 0x01 | (ARITH_CMP << 3), arg2, arg1);
}
}
static void tcg_out_brcond(TCGContext *s, int cond,
TCGArg arg1, TCGArg arg2, int const_arg2,
int label_index, int small)
{
tcg_out_cmp(s, arg1, arg2, const_arg2);
tcg_out_jxx(s, tcg_cond_to_jcc[cond], label_index, small);
}
@ -460,6 +466,57 @@ static void tcg_out_brcond2(TCGContext *s, const TCGArg *args,
tcg_out_label(s, label_next, (tcg_target_long)s->code_ptr);
}
static void tcg_out_setcond(TCGContext *s, int cond, TCGArg dest,
TCGArg arg1, TCGArg arg2, int const_arg2)
{
tcg_out_cmp(s, arg1, arg2, const_arg2);
/* setcc */
tcg_out_modrm(s, 0x90 | tcg_cond_to_jcc[cond] | P_EXT, 0, dest);
tgen_arithi(s, ARITH_AND, dest, 0xff, 0);
}
static void tcg_out_setcond2(TCGContext *s, const TCGArg *args,
const int *const_args)
{
TCGArg new_args[6];
int label_true, label_over;
memcpy(new_args, args+1, 5*sizeof(TCGArg));
if (args[0] == args[1] || args[0] == args[2]
|| (!const_args[3] && args[0] == args[3])
|| (!const_args[4] && args[0] == args[4])) {
/* When the destination overlaps with one of the argument
registers, don't do anything tricky. */
label_true = gen_new_label();
label_over = gen_new_label();
new_args[5] = label_true;
tcg_out_brcond2(s, new_args, const_args+1, 1);
tcg_out_movi(s, TCG_TYPE_I32, args[0], 0);
tcg_out_jxx(s, JCC_JMP, label_over, 1);
tcg_out_label(s, label_true, (tcg_target_long)s->code_ptr);
tcg_out_movi(s, TCG_TYPE_I32, args[0], 1);
tcg_out_label(s, label_over, (tcg_target_long)s->code_ptr);
} else {
/* When the destination does not overlap one of the arguments,
clear the destination first, jump if cond false, and emit an
increment in the true case. This results in smaller code. */
tcg_out_movi(s, TCG_TYPE_I32, args[0], 0);
label_over = gen_new_label();
new_args[4] = tcg_invert_cond(new_args[4]);
new_args[5] = label_over;
tcg_out_brcond2(s, new_args, const_args+1, 1);
tgen_arithi(s, ARITH_ADD, args[0], 1, 0);
tcg_out_label(s, label_over, (tcg_target_long)s->code_ptr);
}
}
#if defined(CONFIG_SOFTMMU)
#include "../../softmmu_defs.h"
@ -1121,6 +1178,13 @@ static inline void tcg_out_op(TCGContext *s, int opc,
tcg_out_modrm(s, 0xb7 | P_EXT, args[0], args[1]);
break;
case INDEX_op_setcond_i32:
tcg_out_setcond(s, args[3], args[0], args[1], args[2], const_args[2]);
break;
case INDEX_op_setcond2_i32:
tcg_out_setcond2(s, args, const_args);
break;
case INDEX_op_qemu_ld8u:
tcg_out_qemu_ld(s, args, 0);
break;
@ -1209,6 +1273,9 @@ static const TCGTargetOpDef x86_op_defs[] = {
{ INDEX_op_ext8u_i32, { "r", "q"} },
{ INDEX_op_ext16u_i32, { "r", "r"} },
{ INDEX_op_setcond_i32, { "q", "r", "ri" } },
{ INDEX_op_setcond2_i32, { "r", "r", "r", "ri", "ri" } },
#if TARGET_LONG_BITS == 32
{ INDEX_op_qemu_ld8u, { "r", "L" } },
{ INDEX_op_qemu_ld8s, { "r", "L" } },