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| author | bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162> | 2008-05-25 18:41:58 +0000 |
|---|---|---|
| committer | bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162> | 2008-05-25 18:41:58 +0000 |
| commit | affa3264db0fa0508d3fe9755592a21f48cc077e (patch) | |
| tree | 082e80ba64e8ebb74c78e41d832886158ca743d7 /tcg | |
| parent | 0a6b7b7813799f76e1859387688611af05db376c (diff) | |
| download | qemu-affa3264db0fa0508d3fe9755592a21f48cc077e.tar.gz qemu-affa3264db0fa0508d3fe9755592a21f48cc077e.tar.bz2 qemu-affa3264db0fa0508d3fe9755592a21f48cc077e.zip | |
jump optimizations
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4582 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'tcg')
| -rw-r--r-- | tcg/i386/tcg-target.c | 40 |
1 files changed, 9 insertions, 31 deletions
diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c index c3b7a03b35..cf453b3e46 100644 --- a/tcg/i386/tcg-target.c +++ b/tcg/i386/tcg-target.c @@ -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: |