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| author | Ulrich Drepper <drepper@redhat.com> | 2004-07-20 07:06:48 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2004-07-20 07:06:48 +0000 |
| commit | 164f863efd3c4fa9183ab85f2af82583c88ae90d (patch) | |
| tree | 967a8dd5467587fc409e9f5f41b203368ebd41ae /sysdeps/i386/fpu/e_powl.S | |
| parent | c747e725e310d16c40aa815ed9e3e9f2805351e7 (diff) | |
| download | glibc-164f863efd3c4fa9183ab85f2af82583c88ae90d.tar.gz glibc-164f863efd3c4fa9183ab85f2af82583c88ae90d.tar.xz glibc-164f863efd3c4fa9183ab85f2af82583c88ae90d.zip | |
[BZ #258]
Update. 2004-07-19 Jakub Jelinek <jakub@redhat.com> [BZ #258] * math/libm-test.inc (max_value, min_value): New variables. (initialize): Initialize them. (pow_test): Add a couple of new tests. * sysdeps/i386/fpu/e_powf.S (__ieee754_powf): Don't generate invalid exception if |y| >= 1U<<31. * sysdeps/i386/fpu/e_pow.S (__ieee754_pow): Don't generate invalid exception if |y| >= 1L<<63. * sysdeps/i386/fpu/e_powl.S (__ieee754_powl): Likewise. If y*log2(x) overflows to +-inf, return still +inf/+0 instead of NaN. * sysdeps/x86_64/fpu/e_powl.S (__ieee754_powl): Likewise.
Diffstat (limited to 'sysdeps/i386/fpu/e_powl.S')
| -rw-r--r-- | sysdeps/i386/fpu/e_powl.S | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/sysdeps/i386/fpu/e_powl.S b/sysdeps/i386/fpu/e_powl.S index 5d82571128..080764b84a 100644 --- a/sysdeps/i386/fpu/e_powl.S +++ b/sysdeps/i386/fpu/e_powl.S @@ -1,5 +1,6 @@ /* ix87 specific implementation of pow function. - Copyright (C) 1996, 1997, 1998, 1999, 2001 Free Software Foundation, Inc. + Copyright (C) 1996, 1997, 1998, 1999, 2001, 2004 + Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. @@ -48,6 +49,9 @@ one: .double 1.0 ASM_TYPE_DIRECTIVE(limit,@object) limit: .double 0.29 ASM_SIZE_DIRECTIVE(limit) + ASM_TYPE_DIRECTIVE(p63,@object) +p63: .byte 0, 0, 0, 0, 0, 0, 0xe0, 0x43 + ASM_SIZE_DIRECTIVE(p63) #ifdef PIC #define MO(op) op##@GOTOFF(%ecx) @@ -96,6 +100,14 @@ ENTRY(__ieee754_powl) fxch // y : x + /* fistpll raises invalid exception for |y| >= 1L<<63. */ + fld %st // y : y : x + fabs // |y| : y : x + fcompl MO(p63) // y : x + fnstsw + sahf + jnc 2f + /* First see whether `y' is a natural number. In this case we can use a more precise algorithm. */ fld %st // y : y : x @@ -161,6 +173,11 @@ ENTRY(__ieee754_powl) 7: fyl2x // log2(x) : y 8: fmul %st(1) // y*log2(x) : y + fxam + fnstsw + andb $0x45, %ah + cmpb $0x05, %ah // is y*log2(x) == ±inf ? + je 28f fst %st(1) // y*log2(x) : y*log2(x) frndint // int(y*log2(x)) : y*log2(x) fsubr %st, %st(1) // int(y*log2(x)) : fract(y*log2(x)) @@ -172,6 +189,12 @@ ENTRY(__ieee754_powl) fstp %st(1) // 2^fract(y*log2(x))*2^int(y*log2(x)) ret +28: fstp %st(1) // y*log2(x) + fldl MO(one) // 1 : y*log2(x) + fscale // 2^(y*log2(x)) : y*log2(x) + addl $8, %esp + fstp %st(1) // 2^(y*log2(x)) + ret // pow(x,±0) = 1 .align ALIGNARG(4) |