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Reset bit_AVX in __cpu_features is OS support is missing

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This commit is contained in:
Ulrich Drepper 2012-01-26 07:45:14 -05:00
parent bdb6de1d6d
commit afc5ed09cb
4 changed files with 24 additions and 4 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2012-01-26 Ulrich Drepper <drepper@gmail.com>
[BZ #13583]
* sysdeps/x86_64/multiarch/init-arch.h: Define bit_OSXSAVE.
* sysdeps/x86_64/multiarch/init-arch.c (__init_cpu_features): If
bit_AVX is set also check OSXAVE/XCR0 and reset bit_AVX if necessary.
2012-01-25 Joseph Myers <joseph@codesourcery.com>
* elf/tst-unique3.cc (gets): Remove declaration.

4
NEWS
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@ -1,4 +1,4 @@
GNU C Library NEWS -- history of user-visible changes. 2012-1-10
GNU C Library NEWS -- history of user-visible changes. 2012-1-26
Copyright (C) 1992-2009, 2010, 2011, 2012 Free Software Foundation, Inc.
See the end for copying conditions.
@ -10,7 +10,7 @@ Version 2.16
* The following bugs are resolved with this release:
13525, 13526, 13527, 13528, 13529, 13531, 13532, 13533, 13547, 13530,
13551, 13552, 13553, 13555, 13559
13551, 13552, 13553, 13555, 13559, 13583
* ISO C11 support:

14
sysdeps/x86_64/multiarch/init-arch.c
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@ -1,6 +1,6 @@
/* Initialize CPU feature data.
This file is part of the GNU C Library.
Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
Copyright (C) 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
Contributed by Ulrich Drepper <drepper@redhat.com>.
The GNU C Library is free software; you can redistribute it and/or
@ -144,6 +144,18 @@ __init_cpu_features (void)
else
kind = arch_kind_other;
if (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & bit_AVX)
{
/* Reset the AVX bit in case OSXSAVE is disabled. */
if ((__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & bit_OSXSAVE) == 0
|| ({ unsigned int xcrlow;
unsigned int xcrhigh;
asm ("xgetbv"
: "=a" (xcrlow), "=d" (xcrhigh) : "c" (0));
(xcrlow & 6) != 6; }))
__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx &= ~bit_AVX;
}
__cpu_features.family = family;
__cpu_features.model = model;
atomic_write_barrier ();

3
sysdeps/x86_64/multiarch/init-arch.h
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@ -1,5 +1,5 @@
/* This file is part of the GNU C Library.
Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
Copyright (C) 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@ -27,6 +27,7 @@
#define bit_SSSE3 (1 << 9)
#define bit_SSE4_1 (1 << 19)
#define bit_SSE4_2 (1 << 20)
#define bit_OSXSAVE (1 << 27)
#define bit_AVX (1 << 28)
#define bit_POPCOUNT (1 << 23)
#define bit_FMA (1 << 12)