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made the code i commented-out in r167 work correctly. games that had problems when the "disable underflow" speedhack was left Un-Checked, should now be fixed. 

git-svn-id: http://pcsx2-playground.googlecode.com/svn/trunk@169 a6443dda-0b58-4228-96e9-037be469359c
This commit is contained in:
cottonvibes 2008-10-02 12:20:58 +00:00 committed by Gregory Hainaut
parent e5ca03fc17
commit 34a196376b
1 changed files with 4 additions and 6 deletions
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10
pcsx2/x86/iVUmicro.c
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@ -1478,13 +1478,11 @@ void recUpdateFlags(VURegs * VU, int reg, int info)
//-------------------------Optional Code: Denormals Are Zero------------------------------
if (CHECK_UNDERFLOW) { // Sets underflow/denormals to zero
/*
SSE_ANDNPS_XMM_to_XMM(t1reg, reg); // t1reg = !t1reg & reg
SSE_ANDNPS_XMM_to_XMM(t1reg, reg); // t1reg = !t1reg & reg (t1reg = denormals are positive zero)
VU_MERGE_REGS_CUSTOM(t1reg, reg, (15 - flipMask[_X_Y_Z_W])); // Send t1reg the vectors that shouldn't be modified (since reg was flipped, we need a mask to get the unmodified vectors)
// Now we have Denormals are Positive Zero in t1reg; the next two lines take Signed Zero into account
SSE_ANDPS_M128_to_XMM(reg, (uptr)&VU_Signed_Zero_Mask[ 0 ]);
SSE_ORPS_XMM_to_XMM(reg, t1reg);
*/
// ToDO: Make it so that we only set modified vectors to zero! (the current code sets denormals to zero even if the vector isn't used in the calculation)
SSE_ANDPS_M128_to_XMM(reg, (uptr)&VU_Signed_Zero_Mask[ 0 ]); // Only keep the sign bit for each vector
SSE_ORPS_XMM_to_XMM(reg, t1reg); // Denormals are Signed Zero, and unmodified vectors stay the same!
}
x86SetJ32(pjmp32); // If we skipped the Underflow Flag Checking (when we had an Overflow), return here