diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/wordsize-64/s_scalbn.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/s_scalbn.c | 24 |
1 files changed, 8 insertions, 16 deletions
diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_scalbn.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_scalbn.c index 25cf3b1..7f0e21f 100644 --- a/sysdeps/ieee754/dbl-64/wordsize-64/s_scalbn.c +++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_scalbn.c @@ -1,4 +1,3 @@ -/* @(#)s_scalbn.c 5.1 93/09/24 */ /* * ==================================================== * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. @@ -20,39 +19,32 @@ #include "math.h" #include "math_private.h" -#ifdef __STDC__ static const double -#else -static double -#endif two54 = 1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */ twom54 = 5.55111512312578270212e-17, /* 0x3C900000, 0x00000000 */ huge = 1.0e+300, tiny = 1.0e-300; -#ifdef __STDC__ - double __scalbn (double x, int n) -#else - double __scalbn (x,n) - double x; int n; -#endif +double +__scalbn (double x, int n) { int64_t ix; int64_t k; EXTRACT_WORDS64(ix,x); k = (ix >> 52) & 0x7ff; /* extract exponent */ - if (k==0) { /* 0 or subnormal x */ + if (__builtin_expect(k==0, 0)) { /* 0 or subnormal x */ if ((ix & UINT64_C(0xfffffffffffff))==0) return x; /* +-0 */ x *= two54; EXTRACT_WORDS64(ix,x); k = ((ix >> 52) & 0x7ff) - 54; } - if (k==0x7ff) return x+x; /* NaN or Inf */ + if (__builtin_expect(k==0x7ff, 0)) return x+x; /* NaN or Inf */ k = k+n; - if (n> 50000 || k > 0x7fe) + if (__builtin_expect(n> 50000 || k > 0x7fe, 0)) return huge*__copysign(huge,x); /* overflow */ - if (n< -50000) return tiny*__copysign(tiny,x); /*underflow*/ - if (k > 0) /* normal result */ + if (__builtin_expect(n< -50000, 0)) + return tiny*__copysign(tiny,x); /*underflow*/ + if (__builtin_expect(k > 0, 1)) /* normal result */ {INSERT_WORDS64(x,(ix&UINT64_C(0x800fffffffffffff))|(k<<52)); return x;} if (k <= -54) |