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Merge pull request #2700 from Sintendo/fresbranch 

Jit64: Eliminate branch in GenFres
This commit is contained in:
flacs 2015-07-05 15:20:38 +02:00
parent 1af8b62d9f ce10525056
commit f03f9cccc4
1 changed files with 5 additions and 7 deletions
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12
Source/Core/Core/PowerPC/Jit64Common/Jit64AsmCommon.cpp
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@ -119,13 +119,12 @@ void CommonAsmRoutines::GenFres()
MOV(32, R(RSCRATCH2), R(RSCRATCH_EXTRA));
AND(32, R(RSCRATCH_EXTRA), Imm32(0x7FF)); // exp
AND(32, R(RSCRATCH2), Imm32(0x800)); // sign
CMP(32, R(RSCRATCH_EXTRA), Imm32(895));
SUB(32, R(RSCRATCH_EXTRA), Imm32(895));
CMP(32, R(RSCRATCH_EXTRA), Imm32(1149 - 895));
// Take the complex path for very large/small exponents.
FixupBranch complex1 = J_CC(CC_L);
CMP(32, R(RSCRATCH_EXTRA), Imm32(1149));
FixupBranch complex2 = J_CC(CC_GE);
FixupBranch complex = J_CC(CC_AE); // if (exp < 895 || exp >= 1149)
SUB(32, R(RSCRATCH_EXTRA), Imm32(0x7FD));
SUB(32, R(RSCRATCH_EXTRA), Imm32(0x7FD - 895));
NEG(32, R(RSCRATCH_EXTRA));
OR(32, R(RSCRATCH_EXTRA), R(RSCRATCH2));
SHL(64, R(RSCRATCH_EXTRA), Imm8(52)); // vali = sign | exponent
@ -154,8 +153,7 @@ void CommonAsmRoutines::GenFres()
OR(32, PPCSTATE(fpscr), Imm32(FPSCR_FX | FPSCR_ZX));
SetJumpTarget(skip_set_fx1);
SetJumpTarget(complex1);
SetJumpTarget(complex2);
SetJumpTarget(complex);
ABI_PushRegistersAndAdjustStack(QUANTIZED_REGS_TO_SAVE, 8);
ABI_CallFunction((void *)&MathUtil::ApproximateReciprocal);
ABI_PopRegistersAndAdjustStack(QUANTIZED_REGS_TO_SAVE, 8);