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interp: Force vscmp result of invalid to zero.

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Some other ops do this, but mostly only that do plus or minus.
This commit is contained in:
Unknown W. Brackets 2019-03-25 22:59:37 -07:00
parent c7e83cd4fa
commit aa998b815c
1 changed files with 18 additions and 0 deletions
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18
Core/MIPS/MIPSIntVFPU.cpp
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@ -170,6 +170,23 @@ void ApplyPrefixD(float *v, VectorSize size, bool onlyWriteMask = false)
}
}
static void RetainInvalidSwizzleST(float *d, VectorSize sz) {
// Somehow it's like a supernan, maybe wires through to zero?
// Doesn't apply to all ops.
int sPrefix = currentMIPS->vfpuCtrl[VFPU_CTRL_SPREFIX];
int tPrefix = currentMIPS->vfpuCtrl[VFPU_CTRL_TPREFIX];
int n = GetNumVectorElements(sz);
for (int i = 0; i < n; i++) {
int swizzleS = (sPrefix >> (i + i)) & 3;
int swizzleT = (tPrefix >> (i + i)) & 3;
int constS = (sPrefix >> (12 + i)) & 1;
int constT = (tPrefix >> (12 + i)) & 1;
if ((swizzleS >= n && !constS) || (swizzleT >= n && !constT))
d[i] = 0.0f;
}
}
void EatPrefixes()
{
currentMIPS->vfpuCtrl[VFPU_CTRL_SPREFIX] = 0xe4; // passthru
@ -1707,6 +1724,7 @@ namespace MIPSInt
d.f[i] = (float)((0.0f < a) - (a < 0.0f));
}
}
RetainInvalidSwizzleST(d.f, sz);
ApplyPrefixD(d.f, sz);
WriteVector(d.f, sz, vd);
PC += 4;