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Fix intermediate truncation in vector FP fused multiply-add.

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This commit is contained in:
Andrew Church
2015-01-18 07:05:38 +09:00
parent 3eb3f66e96
commit 9a310c312e
1 changed files with 2 additions and 2 deletions
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rpcs3/Emu/Cell/PPUInterpreter.h
+2 -2
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@@ -865,7 +865,7 @@ private:
CPU.VPR[vd]._f[w] = (float)FPR_NAN; CPU.VPR[vd]._f[w] = (float)FPR_NAN;
else else
{ {
CPU.VPR[vd]._f[w] = a * c + b; CPU.VPR[vd]._f[w] = fmaf(a, c, b);
if (std::isnan(CPU.VPR[vd]._f[w])) if (std::isnan(CPU.VPR[vd]._f[w]))
CPU.VPR[vd]._f[w] = (float)FPR_NAN; CPU.VPR[vd]._f[w] = (float)FPR_NAN;
} }
@@ -1288,7 +1288,7 @@ private:
CPU.VPR[vd]._f[w] = (float)FPR_NAN; CPU.VPR[vd]._f[w] = (float)FPR_NAN;
else else
{ {
CPU.VPR[vd]._f[w] = -(a * c - b); CPU.VPR[vd]._f[w] = -fmaf(a, c, -b);
if (std::isnan(CPU.VPR[vd]._f[w])) if (std::isnan(CPU.VPR[vd]._f[w]))
CPU.VPR[vd]._f[w] = (float)FPR_NAN; CPU.VPR[vd]._f[w] = (float)FPR_NAN;
} }