aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/ieee754/flt-32/e_log10f.c
diff options
context:
space:
mode:
authorUlrich Drepper <drepper@gmail.com>2011-10-12 11:27:51 -0400
committerUlrich Drepper <drepper@gmail.com>2011-10-12 11:27:51 -0400
commit0ac5ae2335292908f39031b1ea9fe8edce433c0f (patch)
treef9d26c8abc0de39d18d4c13e70f6022cdc6b461f /sysdeps/ieee754/flt-32/e_log10f.c
parenta843a204a3e8a0dd53584dad3668771abaec84ac (diff)
downloadglibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.tar
glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.tar.gz
glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.tar.bz2
glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.zip
Optimize libm
libm is now somewhat integrated with gcc's -ffinite-math-only option and lots of the wrapper functions have been optimized.
Diffstat (limited to 'sysdeps/ieee754/flt-32/e_log10f.c')
-rw-r--r--sysdeps/ieee754/flt-32/e_log10f.c42
1 files changed, 14 insertions, 28 deletions
diff --git a/sysdeps/ieee754/flt-32/e_log10f.c b/sysdeps/ieee754/flt-32/e_log10f.c
index cea3d9156b..72dcea6250 100644
--- a/sysdeps/ieee754/flt-32/e_log10f.c
+++ b/sysdeps/ieee754/flt-32/e_log10f.c
@@ -13,55 +13,41 @@
* ====================================================
*/
-#if defined(LIBM_SCCS) && !defined(lint)
-static char rcsid[] = "$NetBSD: e_log10f.c,v 1.5 1995/05/10 20:45:53 jtc Exp $";
-#endif
-
#include "math.h"
#include "math_private.h"
-#ifdef __STDC__
static const float
-#else
-static float
-#endif
two25 = 3.3554432000e+07, /* 0x4c000000 */
ivln10 = 4.3429449201e-01, /* 0x3ede5bd9 */
log10_2hi = 3.0102920532e-01, /* 0x3e9a2080 */
log10_2lo = 7.9034151668e-07; /* 0x355427db */
-#ifdef __STDC__
static const float zero = 0.0;
-#else
-static float zero = 0.0;
-#endif
-#ifdef __STDC__
- float __ieee754_log10f(float x)
-#else
- float __ieee754_log10f(x)
- float x;
-#endif
+float
+__ieee754_log10f(float x)
{
float y,z;
int32_t i,k,hx;
GET_FLOAT_WORD(hx,x);
- k=0;
- if (hx < 0x00800000) { /* x < 2**-126 */
- if ((hx&0x7fffffff)==0)
- return -two25/(x-x); /* log(+-0)=-inf */
- if (hx<0) return (x-x)/(x-x); /* log(-#) = NaN */
- k -= 25; x *= two25; /* subnormal number, scale up x */
+ k=0;
+ if (hx < 0x00800000) { /* x < 2**-126 */
+ if (__builtin_expect((hx&0x7fffffff)==0, 0))
+ return -two25/(x-x); /* log(+-0)=-inf */
+ if (__builtin_expect(hx<0, 0))
+ return (x-x)/(x-x); /* log(-#) = NaN */
+ k -= 25; x *= two25; /* subnormal number, scale up x */
GET_FLOAT_WORD(hx,x);
- }
- if (hx >= 0x7f800000) return x+x;
+ }
+ if (__builtin_expect(hx >= 0x7f800000, 0)) return x+x;
k += (hx>>23)-127;
i = ((u_int32_t)k&0x80000000)>>31;
- hx = (hx&0x007fffff)|((0x7f-i)<<23);
- y = (float)(k+i);
+ hx = (hx&0x007fffff)|((0x7f-i)<<23);
+ y = (float)(k+i);
SET_FLOAT_WORD(x,hx);
z = y*log10_2lo + ivln10*__ieee754_logf(x);
return z+y*log10_2hi;
}
+strong_alias (__ieee754_log10f, __log10f_finite)