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Merge pull request #2088 from Sintendo/diecmp

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Emit 'TEST reg, reg' for 'CMP reg, 0' automatically
This commit is contained in:
comex
2015-04-23 16:34:23 -04:00
parent e4b5637c3a c19482c9a3
commit b3aaa46d42
7 changed files with 28 additions and 14 deletions
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12
Source/Core/Common/x64Emitter.cpp
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@ -1274,6 +1274,18 @@ void XEmitter::MOV (int bits, const OpArg &a1, const OpArg &a2)
void XEmitter::TEST(int bits, const OpArg &a1, const OpArg &a2) {CheckFlags(); WriteNormalOp(bits, nrmTEST, a1, a2);}
void XEmitter::CMP (int bits, const OpArg &a1, const OpArg &a2) {CheckFlags(); WriteNormalOp(bits, nrmCMP, a1, a2);}
void XEmitter::XCHG(int bits, const OpArg &a1, const OpArg &a2) {WriteNormalOp(bits, nrmXCHG, a1, a2);}
void XEmitter::CMP_or_TEST(int bits, const OpArg &a1, const OpArg &a2)
{
CheckFlags();
if (a1.IsSimpleReg() && a2.IsImm() && a2.offset == 0) // turn 'CMP reg, 0' into shorter 'TEST reg, reg'
{
WriteNormalOp(bits, nrmTEST, a1, a1);
}
else
{
WriteNormalOp(bits, nrmCMP, a1, a2);
}
}
void XEmitter::IMUL(int bits, X64Reg regOp, OpArg a1, OpArg a2)
{