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Simplify CPUID value handling.

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SO far Intel and AMD use exactly the same bits meaning the same
things in CPUID index 1.  Simplify the code.  Should an architecture
come along which doesn't use the same semantics then it must use a
different index value than COMMON_CPUID_INDEX_1.
This commit is contained in:
Ulrich Drepper 2009-05-31 17:52:05 -07:00
parent fd469aac31
commit 963cb6fcb4
5 changed files with 36 additions and 39 deletions
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20
ChangeLog
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@ -1,8 +1,24 @@
2009-05-31 Ulrich Drepper <drepper@redhat.com>
* sysdeps/x86_64/multiarch/init-arch.h: Define COMMON_CPUID_INDEX_1
instead of INTEL_CPUID_INDEX_1 and AMD_CPUID_INDEX_1. So far there
are no differences. If an architecture has bits in CPUID index 1
meaning different things the values for the COMMON_CPUID_INDEX_1
index must not be set.
(INTEL_HAS_POPCOUNT, AMD_HAS_POPCOUNT): Removed in favor of...
(HAS_POPCOUNT): ...this. New macro.
* sysdeps/x86_64/multiarch/init-arch.c: Use COMMON_CPUID_INDEX_1
instead of INTEL_CPUID_INDEX_1 and AMD_CPUID_INDEX_1. Unify code
to set the value for Intel and AMD architectures.
* sysdeps/x86_64/cacheinfo.c: Use COMMON_CPUID_INDEX_1 instead of
INTEL_CPUID_INDEX_1.
* sysdeps/x86_64/multiarch/sched_cpucount.c: Adjust for HAS_POPCOUNT
change.
2009-05-30 Andreas Schwab <schwab@linux-m68k.org>
* configure.in: Move AC_CANONICAL_HOST before first use of $host
and $build.
* configure: Regenerated.
2009-05-29 Jakub Jelinek <jakub@redhat.com>
@ -15,8 +31,6 @@
* sysdeps/ieee754/ldbl-128/s_sinl.c: Include <errno.h>.
(__sinl): Set errno to EDOM for ±Inf.
2009-05-29 Jakub Jelinek <jakub@redhat.com>
* sysdeps/s390/s390-32/__longjmp.c (__longjmp): If CHECK_SP is
defined, use it.
* sysdeps/s390/s390-64/__longjmp.c (__longjmp): Likewise.

8
sysdeps/x86_64/cacheinfo.c
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@ -489,10 +489,10 @@ init_cacheinfo (void)
}
#ifdef USE_MULTIARCH
eax = __cpu_features.cpuid[INTEL_CPUID_INDEX_1].eax;
ebx = __cpu_features.cpuid[INTEL_CPUID_INDEX_1].ebx;
ecx = __cpu_features.cpuid[INTEL_CPUID_INDEX_1].ecx;
edx = __cpu_features.cpuid[INTEL_CPUID_INDEX_1].edx;
eax = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax;
ebx = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ebx;
ecx = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx;
edx = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].edx;
#else
asm volatile ("cpuid"
: "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)

18
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 Free Software Foundation, Inc.
Copyright (C) 2008, 2009 Free Software Foundation, Inc.
Contributed by Ulrich Drepper <drepper@redhat.com>.
The GNU C Library is free software; you can redistribute it and/or
@ -41,11 +41,12 @@ __init_cpu_features (void)
{
__cpu_features.kind = arch_kind_intel;
get_common_cpuid:
asm volatile ("cpuid"
: "=a" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].eax),
"=b" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].ebx),
"=c" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].ecx),
"=d" (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].edx)
: "=a" (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax),
"=b" (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ebx),
"=c" (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx),
"=d" (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].edx)
: "0" (1));
}
/* This spells out "AuthenticAMD". */
@ -53,12 +54,7 @@ __init_cpu_features (void)
{
__cpu_features.kind = arch_kind_amd;
asm volatile ("cpuid"
: "=a" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].eax),
"=b" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].ebx),
"=c" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].ecx),
"=d" (__cpu_features.cpuid[AMD_CPUID_INDEX_1].edx)
: "0" (1));
goto get_common_cpuid;
}
else
__cpu_features.kind = arch_kind_other;

24
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 Free Software Foundation, Inc.
Copyright (C) 2008, 2009 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
@ -20,16 +20,9 @@
enum
{
INTEL_CPUID_INDEX_1 = 0,
COMMON_CPUID_INDEX_1 = 0,
/* Keep the following line at the end. */
INTEL_CPUID_INDEX_MAX
};
enum
{
AMD_CPUID_INDEX_1 = 0,
/* Keep the following line at the end. */
AMD_CPUID_INDEX_MAX
COMMON_CPUID_INDEX_MAX
};
extern struct cpu_features
@ -48,7 +41,7 @@ extern struct cpu_features
unsigned int ebx;
unsigned int ecx;
unsigned int edx;
} cpuid[MAX (INTEL_CPUID_INDEX_MAX, AMD_CPUID_INDEX_MAX)];
} cpuid[COMMON_CPUID_INDEX_MAX];
} __cpu_features attribute_hidden;
@ -61,10 +54,5 @@ extern void __init_cpu_features (void) attribute_hidden;
/* Following are the feature tests used throughout libc. */
#define INTEL_HAS_POPCOUNT \
(__cpu_features.kind == arch_kind_intel \
&& (__cpu_features.cpuid[INTEL_CPUID_INDEX_1].ecx & (1 << 23)) != 0)
#define AMD_HAS_POPCOUNT \
(__cpu_features.kind == arch_kind_amd \
&& (__cpu_features.cpuid[AMD_CPUID_INDEX_1].ecx & (1 << 23)) != 0)
#define HAS_POPCOUNT \
((__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 23)) != 0)

5
sysdeps/x86_64/multiarch/sched_cpucount.c
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@ -1,6 +1,6 @@
/* Count bits in CPU set. x86-64 multi-arch version.
This file is part of the GNU C Library.
Copyright (C) 2008 Free Software Foundation, Inc.
Copyright (C) 2008, 2009 Free Software Foundation, Inc.
Contributed by Ulrich Drepper <drepper@redhat.com>.
The GNU C Library is free software; you can redistribute it and/or
@ -35,8 +35,7 @@
# undef __sched_cpucount
libc_ifunc (__sched_cpucount,
INTEL_HAS_POPCOUNT || AMD_HAS_POPCOUNT
? popcount_cpucount : generic_cpucount);
HAS_POPCOUNT ? popcount_cpucount : generic_cpucount);
#else
# include_next <sched_cpucount.c>
#endif