diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/s_scalbn.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_scalbn.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_scalbn.c b/sysdeps/ieee754/dbl-64/s_scalbn.c index 1e67dbe5eb..c2488fbbee 100644 --- a/sysdeps/ieee754/dbl-64/s_scalbn.c +++ b/sysdeps/ieee754/dbl-64/s_scalbn.c @@ -38,11 +38,13 @@ __scalbn (double x, int n) k = ((hx&0x7ff00000)>>20) - 54; } if (__builtin_expect(k==0x7ff, 0)) return x+x; /* NaN or Inf */ - k = k+n; - if (__builtin_expect(n> 50000 || k > 0x7fe, 0)) - return huge*__copysign(huge,x); /* overflow */ if (__builtin_expect(n< -50000, 0)) return tiny*__copysign(tiny,x); /*underflow*/ + if (__builtin_expect(n> 50000 || k+n > 0x7fe, 0)) + return huge*__copysign(huge,x); /* overflow */ + /* Now k and n are bounded we know that k = k+n does not + overflow. */ + k = k+n; if (__builtin_expect(k > 0, 1)) /* normal result */ {SET_HIGH_WORD(x,(hx&0x800fffff)|(k<<20)); return x;} if (k <= -54) |