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authorJoseph Myers <joseph@codesourcery.com>2013-11-16 12:45:11 +0000
committerJoseph Myers <joseph@codesourcery.com>2013-11-16 12:45:11 +0000
commit66294491665029eff0cf3ebd5fb6f04582da6c1e (patch)
tree5d398338d64b21bba5eb702a543cfd456c46418a /sysdeps/i386/fpu/e_powl.S
parentb46d046e7bf7e0f96e41e522da731b89177e31ab (diff)
downloadglibc-66294491665029eff0cf3ebd5fb6f04582da6c1e.tar.gz
Fix spurious "inexact" exceptions from x86 pow with NaN argument (bug 16167).
Diffstat (limited to 'sysdeps/i386/fpu/e_powl.S')
-rw-r--r--sysdeps/i386/fpu/e_powl.S9
1 files changed, 9 insertions, 0 deletions
diff --git a/sysdeps/i386/fpu/e_powl.S b/sysdeps/i386/fpu/e_powl.S
index 3c23117c39..91e22c8a29 100644
--- a/sysdeps/i386/fpu/e_powl.S
+++ b/sysdeps/i386/fpu/e_powl.S
@@ -104,6 +104,9 @@ ENTRY(__ieee754_powl)
cmpb $0x05, %ah
je 15f // x is ħinf
+ cmpb $0x01, %ah
+ je 32f // x is NaN
+
fxch // y : x
/* fistpll raises invalid exception for |y| >= 1L<<63. */
@@ -188,6 +191,12 @@ ENTRY(__ieee754_powl)
ret
cfi_adjust_cfa_offset (8)
+32: addl $8, %esp
+ cfi_adjust_cfa_offset (-8)
+ fstp %st(1)
+ ret
+
+ cfi_adjust_cfa_offset (8)
.align ALIGNARG(4)
2: // y is a large integer (absolute value at least 8), but
// may be odd unless at least 1L<<64. So it may be necessary