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Fix spurious "inexact" exceptions from x86 pow with NaN argument (bug 16167).

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This commit is contained in:
Joseph Myers 2013-11-16 12:45:11 +00:00
parent b46d046e7b
commit 6629449166
6 changed files with 36 additions and 2 deletions
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10
ChangeLog
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@ -1,3 +1,13 @@
2013-11-16 Joseph Myers <joseph@codesourcery.com>
[BZ #16167]
* sysdeps/i386/fpu/e_pow.S (__ieee754_pow): Check for first
argument being NaN and avoid computations with second argument in
that case.
* sysdeps/i386/fpu/e_powf.S (__ieee754_powf): Likewise.
* sysdeps/i386/fpu/e_powl.S (__ieee754_powl): Likewise.
* sysdeps/x86_64/fpu/e_powl.S (__ieee754_powl): Likewise.
2013-11-15 Arun Kumar Pyasi <arun@chitwanix.com>
* locale/iso-639.def: Add Chitwani Tharu (the).

2
NEWS
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@ -18,7 +18,7 @@ Version 2.19
15887, 15890, 15892, 15893, 15895, 15897, 15905, 15909, 15917, 15919,
15921, 15923, 15939, 15948, 15963, 15966, 15985, 15988, 15997, 16032,
16034, 16036, 16037, 16041, 16071, 16072, 16074, 16078, 16103, 16112,
16143, 16150, 16151, 16153, 16172.
16143, 16150, 16151, 16153, 16167, 16172.
* CVE-2012-4412 The strcoll implementation caches indices and rules for
large collation sequences to optimize multiple passes. This cache

9
sysdeps/i386/fpu/e_pow.S
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@ -98,6 +98,9 @@ ENTRY(__ieee754_pow)
cmpb $0x05, %ah
je 15f // x is ±inf
cmpb $0x01, %ah
je 32f // x is NaN
fxch // y : x
/* fistpll raises invalid exception for |y| >= 1L<<63. */
@ -165,6 +168,12 @@ ENTRY(__ieee754_pow)
31: fstp %st(1)
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 1L<<10), but

5
sysdeps/i386/fpu/e_powf.S
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@ -95,6 +95,9 @@ ENTRY(__ieee754_powf)
cmpb $0x05, %ah
je 15f // x is ±inf
cmpb $0x01, %ah
je 32f // x is NaN
fxch // y : x
/* fistpl raises invalid exception for |y| >= 1L<<31. */
@ -180,7 +183,7 @@ ENTRY(__ieee754_powf)
f2xm1 // 2^fract(y*log2(x))-1 : int(y*log2(x))
faddl MO(one) // 2^fract(y*log2(x)) : int(y*log2(x))
fscale // 2^fract(y*log2(x))*2^int(y*log2(x)) : int(y*log2(x))
addl $4, %esp
32: addl $4, %esp
cfi_adjust_cfa_offset (-4)
fstp %st(1) // 2^fract(y*log2(x))*2^int(y*log2(x))
ret

9
sysdeps/i386/fpu/e_powl.S
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@ -104,6 +104,9 @@ ENTRY(__ieee754_powl)
cmpb $0x05, %ah
je 15f // x is ±inf
cmpb $0x01, %ah
je 32f // x is NaN
fxch // y : x
/* fistpll raises invalid exception for |y| >= 1L<<63. */
@ -187,6 +190,12 @@ ENTRY(__ieee754_powl)
31: fstp %st(1)
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

3
sysdeps/x86_64/fpu/e_powl.S
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@ -96,6 +96,9 @@ ENTRY(__ieee754_powl)
cmpb $0x05, %ah
je 15f // x is ±inf
cmpb $0x01, %ah
je 31f // x is NaN
fxch // y : x
/* fistpll raises invalid exception for |y| >= 1L<<63. */