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jump optimizations 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4582 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2008-05-25 18:41:58 +00:00
parent 0a6b7b7813
commit affa3264db
1 changed files with 9 additions and 31 deletions
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40
tcg/i386/tcg-target.c
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@ -40,7 +40,6 @@ int tcg_target_reg_alloc_order[] = {
TCG_REG_ESI,
TCG_REG_EDI,
TCG_REG_EBP,
TCG_REG_ESP,
};
const int tcg_target_call_iarg_regs[3] = { TCG_REG_EAX, TCG_REG_EDX, TCG_REG_ECX };
@ -329,38 +328,17 @@ static void tcg_out_brcond(TCGContext *s, int cond,
TCGArg arg1, TCGArg arg2, int const_arg2,
int label_index)
{
int c;
if (const_arg2) {
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 */
tcg_out_modrm(s, 0x85, arg1, arg1);
tcg_out_jxx(s, c, label_index);
} else {
do_cmpi:
tgen_arithi(s, ARITH_CMP, arg1, arg2);
tcg_out_jxx(s, tcg_cond_to_jcc[cond], label_index);
}
} else {
tcg_out_modrm(s, 0x01 | (ARITH_CMP << 3), arg2, arg1);
tcg_out_jxx(s, tcg_cond_to_jcc[cond], label_index);
}
tcg_out_jxx(s, tcg_cond_to_jcc[cond], label_index);
}
/* XXX: we implement it at the target level to avoid having to
@ -381,42 +359,42 @@ static void tcg_out_brcond2(TCGContext *s,
break;
case TCG_COND_LT:
tcg_out_brcond(s, TCG_COND_LT, args[1], args[3], const_args[3], args[5]);
tcg_out_brcond(s, TCG_COND_NE, args[1], args[3], const_args[3], label_next);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_LT, args[0], args[2], const_args[2], args[5]);
break;
case TCG_COND_LE:
tcg_out_brcond(s, TCG_COND_LT, args[1], args[3], const_args[3], args[5]);
tcg_out_brcond(s, TCG_COND_NE, args[1], args[3], const_args[3], label_next);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_LE, args[0], args[2], const_args[2], args[5]);
break;
case TCG_COND_GT:
tcg_out_brcond(s, TCG_COND_GT, args[1], args[3], const_args[3], args[5]);
tcg_out_brcond(s, TCG_COND_NE, args[1], args[3], const_args[3], label_next);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_GT, args[0], args[2], const_args[2], args[5]);
break;
case TCG_COND_GE:
tcg_out_brcond(s, TCG_COND_GT, args[1], args[3], const_args[3], args[5]);
tcg_out_brcond(s, TCG_COND_NE, args[1], args[3], const_args[3], label_next);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_GE, args[0], args[2], const_args[2], args[5]);
break;
case TCG_COND_LTU:
tcg_out_brcond(s, TCG_COND_LTU, args[1], args[3], const_args[3], args[5]);
tcg_out_brcond(s, TCG_COND_NE, args[1], args[3], const_args[3], label_next);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_LTU, args[0], args[2], const_args[2], args[5]);
break;
case TCG_COND_LEU:
tcg_out_brcond(s, TCG_COND_LTU, args[1], args[3], const_args[3], args[5]);
tcg_out_brcond(s, TCG_COND_NE, args[1], args[3], const_args[3], label_next);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_LEU, args[0], args[2], const_args[2], args[5]);
break;
case TCG_COND_GTU:
tcg_out_brcond(s, TCG_COND_GTU, args[1], args[3], const_args[3], args[5]);
tcg_out_brcond(s, TCG_COND_NE, args[1], args[3], const_args[3], label_next);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_GTU, args[0], args[2], const_args[2], args[5]);
break;
case TCG_COND_GEU:
tcg_out_brcond(s, TCG_COND_GTU, args[1], args[3], const_args[3], args[5]);
tcg_out_brcond(s, TCG_COND_NE, args[1], args[3], const_args[3], label_next);
tcg_out_jxx(s, JCC_JNE, label_next);
tcg_out_brcond(s, TCG_COND_GEU, args[0], args[2], const_args[2], args[5]);
break;
default: