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x64Emitter: add LZCNT/TZCNT support and detection
Also add a unit test.
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@ -750,12 +750,14 @@ void XEmitter::IDIV(int bits, OpArg src) {WriteMulDivType(bits, src, 7);}
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void XEmitter::NEG(int bits, OpArg src) {WriteMulDivType(bits, src, 3);}
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void XEmitter::NOT(int bits, OpArg src) {WriteMulDivType(bits, src, 2);}
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void XEmitter::WriteBitSearchType(int bits, X64Reg dest, OpArg src, u8 byte2)
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void XEmitter::WriteBitSearchType(int bits, X64Reg dest, OpArg src, u8 byte2, bool rep)
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{
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_assert_msg_(DYNA_REC, !src.IsImm(), "WriteBitSearchType - Imm argument");
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src.operandReg = (u8)dest;
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if (bits == 16)
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Write8(0x66);
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if (rep)
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Write8(0xF3);
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src.WriteRex(this, bits, bits);
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Write8(0x0F);
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Write8(byte2);
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@ -772,6 +774,19 @@ void XEmitter::MOVNTI(int bits, OpArg dest, X64Reg src)
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void XEmitter::BSF(int bits, X64Reg dest, OpArg src) {WriteBitSearchType(bits,dest,src,0xBC);} //bottom bit to top bit
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void XEmitter::BSR(int bits, X64Reg dest, OpArg src) {WriteBitSearchType(bits,dest,src,0xBD);} //top bit to bottom bit
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void XEmitter::TZCNT(int bits, X64Reg dest, OpArg src)
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{
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if (!cpu_info.bBMI1)
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PanicAlert("Trying to use BMI1 on a system that doesn't support it. Bad programmer.");
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WriteBitSearchType(bits, dest, src, 0xBC, true);
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}
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void XEmitter::LZCNT(int bits, X64Reg dest, OpArg src)
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{
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if (!cpu_info.bLZCNT)
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PanicAlert("Trying to use LZCNT on a system that doesn't support it. Bad programmer.");
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WriteBitSearchType(bits, dest, src, 0xBD, true);
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}
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void XEmitter::MOVSX(int dbits, int sbits, X64Reg dest, OpArg src)
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{
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_assert_msg_(DYNA_REC, !src.IsImm(), "MOVSX - Imm argument");
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