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handle special case - BSF/BSR vs TZCNT/LZCNT

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This commit is contained in:
Stanislav Shwartsman 2011-09-06 19:18:21 +00:00
parent 184837e0ed
commit 939aee87c9
1 changed files with 15 additions and 0 deletions
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15
bochs/cpu/fetchdecode.cc
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@ -1985,4 +1985,19 @@ void BX_CPU_C::init_FetchDecodeTables(void)
} }
} }
} }
// handle special case - BSF/BSR vs TZCNT/LZCNT
if (! BX_CPUID_SUPPORT_ISA_EXTENSION(BX_CPU_BMI1)) {
BxOpcodesTable[BX_IA_TZCNT_GwEw] = BxOpcodesTable[BX_IA_BSF_GwEw];
BxOpcodesTable[BX_IA_TZCNT_GdEd] = BxOpcodesTable[BX_IA_BSF_GdEd];
#if BX_SUPPORT_X86_64
BxOpcodesTable[BX_IA_TZCNT_GqEq] = BxOpcodesTable[BX_IA_BSF_GqEq];
#endif
BxOpcodesTable[BX_IA_LZCNT_GwEw] = BxOpcodesTable[BX_IA_BSR_GwEw];
BxOpcodesTable[BX_IA_LZCNT_GdEd] = BxOpcodesTable[BX_IA_BSR_GdEd];
#if BX_SUPPORT_X86_64
BxOpcodesTable[BX_IA_LZCNT_GqEq] = BxOpcodesTable[BX_IA_BSR_GqEq];
#endif
}
} }