diff options
Diffstat (limited to 'target-i386/translate.c')
| -rw-r--r-- | target-i386/translate.c | 37 |
1 files changed, 25 insertions, 12 deletions
diff --git a/target-i386/translate.c b/target-i386/translate.c index 251194394..64bc0a3f3 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -6573,23 +6573,36 @@ static target_ulong disas_insn(DisasContext *s, target_ulong pc_start) ot = dflag + OT_WORD; modrm = ldub_code(s->pc++); reg = ((modrm >> 3) & 7) | rex_r; - gen_ldst_modrm(s, modrm, ot, OR_TMP0, 0); + gen_ldst_modrm(s,modrm, ot, OR_TMP0, 0); gen_extu(ot, cpu_T[0]); - label1 = gen_new_label(); - tcg_gen_movi_tl(cpu_cc_dst, 0); t0 = tcg_temp_local_new(); tcg_gen_mov_tl(t0, cpu_T[0]); - tcg_gen_brcondi_tl(TCG_COND_EQ, t0, 0, label1); - if (b & 1) { - gen_helper_bsr(cpu_T[0], t0); + if ((b & 1) && (prefixes & PREFIX_REPZ) && + (s->cpuid_ext3_features & CPUID_EXT3_ABM)) { + switch(ot) { + case OT_WORD: gen_helper_lzcnt(cpu_T[0], t0, + tcg_const_i32(16)); break; + case OT_LONG: gen_helper_lzcnt(cpu_T[0], t0, + tcg_const_i32(32)); break; + case OT_QUAD: gen_helper_lzcnt(cpu_T[0], t0, + tcg_const_i32(64)); break; + } + gen_op_mov_reg_T0(ot, reg); } else { - gen_helper_bsf(cpu_T[0], t0); + label1 = gen_new_label(); + tcg_gen_movi_tl(cpu_cc_dst, 0); + tcg_gen_brcondi_tl(TCG_COND_EQ, t0, 0, label1); + if (b & 1) { + gen_helper_bsr(cpu_T[0], t0); + } else { + gen_helper_bsf(cpu_T[0], t0); + } + gen_op_mov_reg_T0(ot, reg); + tcg_gen_movi_tl(cpu_cc_dst, 1); + gen_set_label(label1); + tcg_gen_discard_tl(cpu_cc_src); + s->cc_op = CC_OP_LOGICB + ot; } - gen_op_mov_reg_T0(ot, reg); - tcg_gen_movi_tl(cpu_cc_dst, 1); - gen_set_label(label1); - tcg_gen_discard_tl(cpu_cc_src); - s->cc_op = CC_OP_LOGICB + ot; tcg_temp_free(t0); } break; |