diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_fma.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_fma.c b/sysdeps/ieee754/dbl-64/s_fma.c index 07fe715617..cd28830709 100644 --- a/sysdeps/ieee754/dbl-64/s_fma.c +++ b/sysdeps/ieee754/dbl-64/s_fma.c @@ -55,16 +55,17 @@ __fma (double x, double y, double z) underflows to 0. */ if (z == 0 && x != 0 && y != 0) return x * y; - /* If x or y or z is Inf/NaN, or if fma will certainly overflow, - or if x * y is zero, compute as x * y + z. */ + /* If x or y or z is Inf/NaN, or if x * y is zero, compute as + x * y + z. */ if (u.ieee.exponent == 0x7ff || v.ieee.exponent == 0x7ff || w.ieee.exponent == 0x7ff - || u.ieee.exponent + v.ieee.exponent - > 0x7ff + IEEE754_DOUBLE_BIAS || x == 0 || y == 0) return x * y + z; + /* If fma will certainly overflow, compute as x * y. */ + if (u.ieee.exponent + v.ieee.exponent > 0x7ff + IEEE754_DOUBLE_BIAS) + return x * y; /* If x * y is less than 1/4 of DBL_DENORM_MIN, neither the result nor whether there is underflow depends on its exact value, only on its sign. */ |