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authorUlrich Drepper <drepper@redhat.com>2004-07-20 07:04:32 +0000
committerUlrich Drepper <drepper@redhat.com>2004-07-20 07:04:32 +0000
commitc747e725e310d16c40aa815ed9e3e9f2805351e7 (patch)
tree1c1e5b3392dc7a91bb4163503350daf91cda29c5 /sysdeps/i386
parentb27e7a54576ba9aa47a2c8d630084c41c502479a (diff)
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(__ieee754_powf): Don't generate invalid exception if |y| >= 1U<<31.
Diffstat (limited to 'sysdeps/i386')
-rw-r--r--sysdeps/i386/fpu/e_powf.S13
1 files changed, 12 insertions, 1 deletions
diff --git a/sysdeps/i386/fpu/e_powf.S b/sysdeps/i386/fpu/e_powf.S
index dce81697db..b3fa624f4d 100644
--- a/sysdeps/i386/fpu/e_powf.S
+++ b/sysdeps/i386/fpu/e_powf.S
@@ -1,5 +1,5 @@
/* ix87 specific implementation of pow function.
- Copyright (C) 1996, 1997, 1999, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1996, 1997, 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 +48,9 @@ one: .double 1.0
ASM_TYPE_DIRECTIVE(limit,@object)
limit: .double 0.29
ASM_SIZE_DIRECTIVE(limit)
+ ASM_TYPE_DIRECTIVE(p31,@object)
+p31: .byte 0, 0, 0, 0, 0, 0, 0xe0, 0x41
+ ASM_SIZE_DIRECTIVE(p31)
#ifdef PIC
#define MO(op) op##@GOTOFF(%ecx)
@@ -96,6 +99,14 @@ ENTRY(__ieee754_powf)
fxch // y : x
+ /* fistpl raises invalid exception for |y| >= 1L<<31. */
+ fld %st // y : y : x
+ fabs // |y| : y : x
+ fcompl MO(p31) // 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