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Jit64AsmCommon: Micro-optimize GenFrsqrte

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Save 2 bytes by testing register against itself and branching on the 
sign flag.

Before:
0:  48 0f ba e0 3f          bt     rax,0x3f

After:
0:  48 85 c0                test   rax,rax
This commit is contained in:
Sintendo 2019-06-05 23:58:44 +02:00
parent 5b5886160e
commit e9d4869965
1 changed files with 2 additions and 2 deletions
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4
Source/Core/Core/PowerPC/Jit64Common/Jit64AsmCommon.cpp
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@ -101,8 +101,8 @@ void CommonAsmRoutines::GenFrsqrte()
MOVQ_xmm(XMM0, R(RSCRATCH)); MOVQ_xmm(XMM0, R(RSCRATCH));
RET(); RET();
SetJumpTarget(inf); SetJumpTarget(inf);
BT(64, R(RSCRATCH), Imm8(63)); TEST(64, R(RSCRATCH), R(RSCRATCH));
FixupBranch negative = J_CC(CC_C); FixupBranch negative = J_CC(CC_S);
XORPD(XMM0, R(XMM0)); XORPD(XMM0, R(XMM0));
RET(); RET();