diff options
author | joseph <joseph@7b3dc134-2b1b-0410-93df-9e9f96275f8d> | 2012-02-08 16:44:31 +0000 |
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committer | joseph <joseph@7b3dc134-2b1b-0410-93df-9e9f96275f8d> | 2012-02-08 16:44:31 +0000 |
commit | 78be84cd747c2e3965bf6c2fd5f702d6ff2f5525 (patch) | |
tree | c070a60ef7c5371bef8b7a559442a6920b394c8e /libc/sysdeps/ieee754/flt-32/s_scalblnf.c | |
parent | de06548e980675e65a1e6d850bb8c3a3f7ec638d (diff) |
Merge changes between r16568 and r17050 from /fsf/trunk.
git-svn-id: svn://svn.eglibc.org/trunk@17051 7b3dc134-2b1b-0410-93df-9e9f96275f8d
Diffstat (limited to 'libc/sysdeps/ieee754/flt-32/s_scalblnf.c')
-rw-r--r-- | libc/sysdeps/ieee754/flt-32/s_scalblnf.c | 38 |
1 files changed, 13 insertions, 25 deletions
diff --git a/libc/sysdeps/ieee754/flt-32/s_scalblnf.c b/libc/sysdeps/ieee754/flt-32/s_scalblnf.c index 4ed48733c..5256c3259 100644 --- a/libc/sysdeps/ieee754/flt-32/s_scalblnf.c +++ b/libc/sysdeps/ieee754/flt-32/s_scalblnf.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 __scalblnf (float x, long int n) -#else - float __scalblnf (x,n) - float x; long int n; -#endif +float +__scalblnf (float x, long 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 (__scalblnf, scalblnf) |