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re PR target/35239 (Build failure when host cc is GCC-2.95.3 or earlier) 

PR target/35239
	* config/i386/cpuid.h (__cpuid, __get_cpuid_max): Use special
	32-bit inline asm without asm alternatives for host GCC < 3.0.

From-SVN: r132430
This commit is contained in:
Jakub Jelinek 2008-02-19 14:34:29 +01:00 committed by Jakub Jelinek
parent 9cadd7f795
commit 2e834acbc1
2 changed files with 35 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2008-02-19 Jakub Jelinek <jakub@redhat.com>
PR target/35239
* config/i386/cpuid.h (__cpuid, __get_cpuid_max): Use special
32-bit inline asm without asm alternatives for host GCC < 3.0.
2008-02-19 Richard Guenther <rguenther@suse.de>
PR tree-optimization/34989

30
gcc/config/i386/cpuid.h
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2007 Free Software Foundation, Inc.
* Copyright (C) 2007, 2008 Free Software Foundation, Inc.
*
* This file is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
@ -61,6 +61,7 @@
#if defined(__i386__) && defined(__PIC__)
/* %ebx may be the PIC register. */
#if __GNUC__ >= 3
#define __cpuid(level, a, b, c, d) \
__asm__ ("xchg{l}\t{%%}ebx, %1\n\t" \
"cpuid\n\t" \
@ -68,6 +69,16 @@
: "=a" (a), "=r" (b), "=c" (c), "=d" (d) \
: "0" (level))
#else
/* Host GCCs older than 3.0 weren't supporting Intel asm syntax
nor alternatives in i386 code. */
#define __cpuid(level, a, b, c, d) \
__asm__ ("xchgl\t%%ebx, %1\n\t" \
"cpuid\n\t" \
"xchgl\t%%ebx, %1\n\t" \
: "=a" (a), "=r" (b), "=c" (c), "=d" (d) \
: "0" (level))
#endif
#else
#define __cpuid(level, a, b, c, d) \
__asm__ ("cpuid\n\t" \
: "=a" (a), "=b" (b), "=c" (c), "=d" (d) \
@ -87,6 +98,7 @@ __get_cpuid_max (unsigned int __ext, unsigned int *__sig)
unsigned int __eax, __ebx, __ecx, __edx;
#ifndef __x86_64__
#if __GNUC__ >= 3
/* See if we can use cpuid. On AMD64 we always can. */
__asm__ ("pushf{l|d}\n\t"
"pushf{l|d}\n\t"
@ -100,6 +112,22 @@ __get_cpuid_max (unsigned int __ext, unsigned int *__sig)
"popf{l|d}\n\t"
: "=&r" (__eax), "=&r" (__ebx)
: "i" (0x00200000));
#else
/* Host GCCs older than 3.0 weren't supporting Intel asm syntax
nor alternatives in i386 code. */
__asm__ ("pushfl\n\t"
"pushfl\n\t"
"popl\t%0\n\t"
"movl\t%0, %1\n\t"
"xorl\t%2, %0\n\t"
"pushl\t%0\n\t"
"popfl\n\t"
"pushfl\n\t"
"popl\t%0\n\t"
"popfl\n\t"
: "=&r" (__eax), "=&r" (__ebx)
: "i" (0x00200000));
#endif
if (!((__eax ^ __ebx) & 0x00200000))
return 0;