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| author | Ulrich Drepper <drepper@gmail.com> | 2011-10-14 23:41:47 -0400 |
|---|---|---|
| committer | Ulrich Drepper <drepper@gmail.com> | 2011-10-14 23:41:47 -0400 |
| commit | 38ad40ceca8ba35761e79cfce4aaef0d0f7583e6 (patch) | |
| tree | 336de2d8f4b91a770418446fe2c322662d321bcd /sysdeps/i386/fpu/e_log.S | |
| parent | 396a21b1d016c52e011f8921e0728aa62a1e9df0 (diff) | |
| download | glibc-38ad40ceca8ba35761e79cfce4aaef0d0f7583e6.tar.gz glibc-38ad40ceca8ba35761e79cfce4aaef0d0f7583e6.tar.xz glibc-38ad40ceca8ba35761e79cfce4aaef0d0f7583e6.zip | |
Optimize x86-32 log
Diffstat (limited to 'sysdeps/i386/fpu/e_log.S')
| -rw-r--r-- | sysdeps/i386/fpu/e_log.S | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/sysdeps/i386/fpu/e_log.S b/sysdeps/i386/fpu/e_log.S index 8110a84535..a2e4d89a40 100644 --- a/sysdeps/i386/fpu/e_log.S +++ b/sysdeps/i386/fpu/e_log.S @@ -62,4 +62,22 @@ ENTRY(__ieee754_log) fstp %st(1) ret END (__ieee754_log) -strong_alias (__ieee754_log, __log_finite) + +ENTRY(__log_finite) + fldln2 // log(2) + fldl 4(%esp) // x : log(2) +#ifdef PIC + LOAD_PIC_REG (dx) +#endif + fld %st // x : x : log(2) + fsubl MO(one) // x-1 : x : log(2) + fld %st // x-1 : x-1 : x : log(2) + fabs // |x-1| : x-1 : x : log(2) + fcompl MO(limit) // x-1 : x : log(2) + fnstsw // x-1 : x : log(2) + andb $0x45, %ah + jz 2b + fstp %st(1) // x-1 : log(2) + fyl2xp1 // log(x) + ret +END(__log_finite) |