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Diffstat (limited to 'src/math/fma.go')
| -rw-r--r-- | src/math/fma.go | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/math/fma.go b/src/math/fma.go index ca0bf99f21..ba03fbe8a9 100644 --- a/src/math/fma.go +++ b/src/math/fma.go @@ -132,6 +132,11 @@ func FMA(x, y, z float64) float64 { ps, pe, pm1, pm2, zs, ze, zm1, zm2 = zs, ze, zm1, zm2, ps, pe, pm1, pm2 } + // Special case: if p == -z the result is always +0 since neither operand is zero. + if ps != zs && pe == ze && pm1 == zm1 && pm2 == zm2 { + return 0 + } + // Align significands zm1, zm2 = shrcompress(zm1, zm2, uint(pe-ze)) |