diff options
Diffstat (limited to 'contrib/gcc/config/i386/crtfastmath.c')
| -rw-r--r-- | contrib/gcc/config/i386/crtfastmath.c | 116 |
1 files changed, 0 insertions, 116 deletions
diff --git a/contrib/gcc/config/i386/crtfastmath.c b/contrib/gcc/config/i386/crtfastmath.c deleted file mode 100644 index 5991442686ab..000000000000 --- a/contrib/gcc/config/i386/crtfastmath.c +++ /dev/null @@ -1,116 +0,0 @@ -/* - * Copyright (C) 2005 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 - * Free Software Foundation; either version 2, or (at your option) any - * later version. - * - * In addition to the permissions in the GNU General Public License, the - * Free Software Foundation gives you unlimited permission to link the - * compiled version of this file with other programs, and to distribute - * those programs without any restriction coming from the use of this - * file. (The General Public License restrictions do apply in other - * respects; for example, they cover modification of the file, and - * distribution when not linked into another program.) - * - * This file is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; see the file COPYING. If not, write to - * the Free Software Foundation, 51 Franklin Street, Fifth Floor, - * Boston, MA 02110-1301, USA. - * - * As a special exception, if you link this library with files - * compiled with GCC to produce an executable, this does not cause - * the resulting executable to be covered by the GNU General Public License. - * This exception does not however invalidate any other reasons why - * the executable file might be covered by the GNU General Public License. - */ - -#define MXCSR_DAZ (1 << 6) /* Enable denormals are zero mode */ -#define MXCSR_FTZ (1 << 15) /* Enable flush to zero mode */ - -#define FXSAVE (1 << 24) -#define SSE (1 << 25) - -static void __attribute__((constructor)) -#ifndef __x86_64__ -/* The i386 ABI only requires 4-byte stack alignment, so this is necessary - to make sure the fxsave struct gets correct alignment. - See PR27537 and PR28621. */ -__attribute__ ((force_align_arg_pointer)) -#endif -set_fast_math (void) -{ -#ifndef __x86_64__ - /* All 64-bit targets have SSE and DAZ; only check them explicitly - for 32-bit ones. */ - unsigned int eax, ebx, ecx, edx; - - /* See if we can use cpuid. */ - asm volatile ("pushfl; pushfl; popl %0; movl %0,%1; xorl %2,%0;" - "pushl %0; popfl; pushfl; popl %0; popfl" - : "=&r" (eax), "=&r" (ebx) - : "i" (0x00200000)); - - if (((eax ^ ebx) & 0x00200000) == 0) - return; - - /* Check the highest input value for eax. */ - asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1" - : "=a" (eax), "=r" (ebx), "=c" (ecx), "=d" (edx) - : "0" (0)); - - if (eax == 0) - return; - - asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1" - : "=a" (eax), "=r" (ebx), "=c" (ecx), "=d" (edx) - : "0" (1)); - - if (edx & SSE) - { - unsigned int mxcsr = __builtin_ia32_stmxcsr (); - - mxcsr |= MXCSR_FTZ; - - if (edx & FXSAVE) - { - /* Check if DAZ is available. */ - struct - { - unsigned short int cwd; - unsigned short int swd; - unsigned short int twd; - unsigned short int fop; - long int fip; - long int fcs; - long int foo; - long int fos; - long int mxcsr; - long int mxcsr_mask; - long int st_space[32]; - long int xmm_space[32]; - long int padding[56]; - } __attribute__ ((aligned (16))) fxsave; - - __builtin_memset (&fxsave, 0, sizeof (fxsave)); - - asm volatile ("fxsave %0" : "=m" (fxsave) : "m" (fxsave)); - - if (fxsave.mxcsr_mask & MXCSR_DAZ) - mxcsr |= MXCSR_DAZ; - } - - __builtin_ia32_ldmxcsr (mxcsr); - } -#else - unsigned int mxcsr = __builtin_ia32_stmxcsr (); - mxcsr |= MXCSR_DAZ | MXCSR_FTZ; - __builtin_ia32_ldmxcsr (mxcsr); -#endif -} |