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jump simplification

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4583 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2008-05-25 18:49:06 +00:00
parent affa3264db
commit 560f92cc34
1 changed files with 1 additions and 22 deletions
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23
tcg/x86_64/tcg-target.c
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@ -450,41 +450,20 @@ static void tcg_out_brcond(TCGContext *s, int cond,
TCGArg arg1, TCGArg arg2, int const_arg2, TCGArg arg1, TCGArg arg2, int const_arg2,
int label_index, int rexw) int label_index, int rexw)
{ {
int c;
if (const_arg2) { if (const_arg2) {
if (arg2 == 0) { if (arg2 == 0) {
/* use test */
switch(cond) {
case TCG_COND_EQ:
c = JCC_JE;
break;
case TCG_COND_NE:
c = JCC_JNE;
break;
case TCG_COND_LT:
c = JCC_JS;
break;
case TCG_COND_GE:
c = JCC_JNS;
break;
default:
goto do_cmpi;
}
/* test r, r */ /* test r, r */
tcg_out_modrm(s, 0x85 | rexw, arg1, arg1); tcg_out_modrm(s, 0x85 | rexw, arg1, arg1);
tcg_out_jxx(s, c, label_index);
} else { } else {
do_cmpi:
if (rexw) if (rexw)
tgen_arithi64(s, ARITH_CMP, arg1, arg2); tgen_arithi64(s, ARITH_CMP, arg1, arg2);
else else
tgen_arithi32(s, ARITH_CMP, arg1, arg2); tgen_arithi32(s, ARITH_CMP, arg1, arg2);
tcg_out_jxx(s, tcg_cond_to_jcc[cond], label_index);
} }
} else { } else {
tcg_out_modrm(s, 0x01 | (ARITH_CMP << 3) | rexw, arg2, arg1); tcg_out_modrm(s, 0x01 | (ARITH_CMP << 3) | rexw, arg2, arg1);
tcg_out_jxx(s, tcg_cond_to_jcc[cond], label_index);
} }
tcg_out_jxx(s, tcg_cond_to_jcc[cond], label_index);
} }
#if defined(CONFIG_SOFTMMU) #if defined(CONFIG_SOFTMMU)