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| author | Joseph Myers <joseph@codesourcery.com> | 2012-05-06 18:23:44 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2012-05-06 18:23:44 +0000 |
| commit | d8b82cad1b525bdcbfff88d218c7c45032e4a3af (patch) | |
| tree | 77e88bf7642e69d74d4df3d771ffbb4274937b31 /sysdeps/i386/fpu/e_exp10l.S | |
| parent | 6c23e11c4dd036e65073d4e4d6bc971a445deaea (diff) | |
| download | glibc-d8b82cad1b525bdcbfff88d218c7c45032e4a3af.tar.gz glibc-d8b82cad1b525bdcbfff88d218c7c45032e4a3af.tar.xz glibc-d8b82cad1b525bdcbfff88d218c7c45032e4a3af.zip | |
Fix exp10 inaccuracy and exceptions (bugs 13884, 13914).
Diffstat (limited to 'sysdeps/i386/fpu/e_exp10l.S')
| -rw-r--r-- | sysdeps/i386/fpu/e_exp10l.S | 41 |
1 files changed, 2 insertions, 39 deletions
diff --git a/sysdeps/i386/fpu/e_exp10l.S b/sysdeps/i386/fpu/e_exp10l.S index 04ec8001d9..d843e2b5e8 100644 --- a/sysdeps/i386/fpu/e_exp10l.S +++ b/sysdeps/i386/fpu/e_exp10l.S @@ -1,39 +1,2 @@ -/* - * Written by Ulrich Drepper <drepper@cygnus.com>. - */ - -#include <machine/asm.h> - -/* 10^x = 2^(x * log2l(10)) */ -ENTRY(__ieee754_exp10l) - fldt 4(%esp) -/* I added the following ugly construct because expl(+-Inf) resulted - in NaN. The ugliness results from the bright minds at Intel. - For the i686 the code can be written better. - -- drepper@cygnus.com. */ - fxam /* Is NaN or +-Inf? */ - fstsw %ax - movb $0x45, %dh - andb %ah, %dh - cmpb $0x05, %dh - je 1f /* Is +-Inf, jump. */ - fldl2t - fmulp /* x * log2(10) */ - fld %st - frndint /* int(x * log2(10)) */ - fsubr %st,%st(1) /* fract(x * log2(10)) */ - fxch - f2xm1 /* 2^(fract(x * log2(10))) - 1 */ - fld1 - faddp /* 2^(fract(x * log2(10))) */ - fscale /* e^x */ - fstp %st(1) - ret - -1: testl $0x200, %eax /* Test sign. */ - jz 2f /* If positive, jump. */ - fstp %st - fldz /* Set result to 0. */ -2: ret -END (__ieee754_exp10l) -strong_alias (__ieee754_exp10l, __exp10l_finite) +#define USE_AS_EXP10L +#include <e_expl.S> |