diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/s_fma.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_fma.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_fma.c b/sysdeps/ieee754/dbl-64/s_fma.c index ce3bd36..c9809fb 100644 --- a/sysdeps/ieee754/dbl-64/s_fma.c +++ b/sysdeps/ieee754/dbl-64/s_fma.c @@ -128,6 +128,11 @@ __fma (double x, double y, double z) y = v.d; z = w.d; } + + /* Ensure correct sign of exact 0 + 0. */ + if (__builtin_expect ((x == 0 || y == 0) && z == 0, 0)) + return x * y + z; + /* Multiplication m1 + m2 = x * y using Dekker's algorithm. */ #define C ((1 << (DBL_MANT_DIG + 1) / 2) + 1) double x1 = x * C; |