diff options
Diffstat (limited to 'sysdeps/ieee754/flt-32/s_scalbnf.c')
| -rw-r--r-- | sysdeps/ieee754/flt-32/s_scalbnf.c | 38 |
1 files changed, 13 insertions, 25 deletions
diff --git a/sysdeps/ieee754/flt-32/s_scalbnf.c b/sysdeps/ieee754/flt-32/s_scalbnf.c index 407cf60..3be2925 100644 --- a/sysdeps/ieee754/flt-32/s_scalbnf.c +++ b/sysdeps/ieee754/flt-32/s_scalbnf.c @@ -13,51 +13,39 @@ * ==================================================== */ -#if defined(LIBM_SCCS) && !defined(lint) -static char rcsid[] = "$NetBSD: s_scalbnf.c,v 1.4 1995/05/10 20:48:10 jtc Exp $"; -#endif - #include "math.h" #include "math_private.h" -#ifdef __STDC__ static const float -#else -static float -#endif two25 = 3.355443200e+07, /* 0x4c000000 */ twom25 = 2.9802322388e-08, /* 0x33000000 */ huge = 1.0e+30, tiny = 1.0e-30; -#ifdef __STDC__ - float __scalbnf (float x, int n) -#else - float __scalbnf (x,n) - float x; int n; -#endif +float +__scalbnf (float x, int n) { int32_t k,ix; GET_FLOAT_WORD(ix,x); - k = (ix&0x7f800000)>>23; /* extract exponent */ - if (k==0) { /* 0 or subnormal x */ - if ((ix&0x7fffffff)==0) return x; /* +-0 */ + k = (ix&0x7f800000)>>23; /* extract exponent */ + if (__builtin_expect(k==0, 0)) { /* 0 or subnormal x */ + if ((ix&0x7fffffff)==0) return x; /* +-0 */ x *= two25; GET_FLOAT_WORD(ix,x); k = ((ix&0x7f800000)>>23) - 25; } - if (k==0xff) return x+x; /* NaN or Inf */ - k = k+n; - if (n> 50000 || k > 0xfe) + if (__builtin_expect(k==0xff, 0)) return x+x; /* NaN or Inf */ + k = k+n; + if (__builtin_expect(n> 50000 || k > 0xfe, 0)) return huge*__copysignf(huge,x); /* overflow */ - if (n< -50000) + if (__builtin_expect(n< -50000, 0)) return tiny*__copysignf(tiny,x); /*underflow*/ - if (k > 0) /* normal result */ + if (__builtin_expect(k > 0, 1)) /* normal result */ {SET_FLOAT_WORD(x,(ix&0x807fffff)|(k<<23)); return x;} - if (k <= -25) + if (k <= -25) return tiny*__copysignf(tiny,x); /*underflow*/ - k += 25; /* subnormal result */ + k += 25; /* subnormal result */ SET_FLOAT_WORD(x,(ix&0x807fffff)|(k<<23)); - return x*twom25; + return x*twom25; } weak_alias (__scalbnf, scalbnf) |