The Tor Browser: gfx/cairo/libpixman/src/pixman-x86.c@6474c204b198 (annotated)

gfx/cairo/libpixman/src/pixman-x86.c@6474c204b198 (annotated)

gfx/cairo/libpixman/src/pixman-x86.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
  * Copyright © 2000 SuSE, Inc.
  * Copyright © 2007 Red Hat, Inc.
  *
  * Permission to use, copy, modify, distribute, and sell this software and its
  * documentation for any purpose is hereby granted without fee, provided that
  * the above copyright notice appear in all copies and that both that
  * copyright notice and this permission notice appear in supporting
  * documentation, and that the name of SuSE not be used in advertising or
  * publicity pertaining to distribution of the software without specific,
  * written prior permission.  SuSE makes no representations about the
  * suitability of this software for any purpose.  It is provided "as is"
  * without express or implied warranty.
  *
  * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
  * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif
 #include "pixman-private.h"
 #if defined(USE_X86_MMX) || defined (USE_SSE2)
 /* The CPU detection code needs to be in a file not compiled with
  * "-mmmx -msse", as gcc would generate CMOV instructions otherwise
  * that would lead to SIGILL instructions on old CPUs that don't have
  * it.
  */
 typedef enum
 {
     X86_MMX			= (1 << 0),
     X86_MMX_EXTENSIONS		= (1 << 1),
     X86_SSE			= (1 << 2) | X86_MMX_EXTENSIONS,
     X86_SSE2			= (1 << 3),
     X86_CMOV			= (1 << 4)
 } cpu_features_t;
 #ifdef HAVE_GETISAX
 #include <sys/auxv.h>
 static cpu_features_t
 detect_cpu_features (void)
 {
     cpu_features_t features = 0;
     unsigned int result = 0;
     if (getisax (&result, 1))
     {
 	if (result & AV_386_CMOV)
 	    features |= X86_CMOV;
 	if (result & AV_386_MMX)
 	    features |= X86_MMX;
 	if (result & AV_386_AMD_MMX)
 	    features |= X86_MMX_EXTENSIONS;
 	if (result & AV_386_SSE)
 	    features |= X86_SSE;
 	if (result & AV_386_SSE2)
 	    features |= X86_SSE2;
     }
     return features;
 }
 #else
 #define _PIXMAN_X86_64							\
     (defined(__amd64__) || defined(__x86_64__) || defined(_M_AMD64))
 static pixman_bool_t
 have_cpuid (void)
 {
 #if _PIXMAN_X86_64 || defined (_MSC_VER)
     return TRUE;
 #elif defined (__GNUC__)
     uint32_t result;
     __asm__ volatile (
         "pushf"				"\n\t"
         "pop %%eax"			"\n\t"
         "mov %%eax, %%ecx"		"\n\t"
         "xor $0x00200000, %%eax"	"\n\t"
         "push %%eax"			"\n\t"
         "popf"				"\n\t"
         "pushf"				"\n\t"
         "pop %%eax"			"\n\t"
         "xor %%ecx, %%eax"		"\n\t"
 	"mov %%eax, %0"			"\n\t"
 	: "=r" (result)
 	:
 	: "%eax", "%ecx");
     return !!result;
 #else
 #error "Unknown compiler"
 #endif
 }
 static void
 pixman_cpuid (uint32_t feature,
 	      uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d)
 {
 #if defined (__GNUC__)
 #if _PIXMAN_X86_64
     __asm__ volatile (
         "cpuid"				"\n\t"
 	: "=a" (*a), "=b" (*b), "=c" (*c), "=d" (*d)
 	: "a" (feature));
 #else
     /* On x86-32 we need to be careful about the handling of %ebx
      * and %esp. We can't declare either one as clobbered
      * since they are special registers (%ebx is the "PIC
      * register" holding an offset to global data, %esp the
      * stack pointer), so we need to make sure that %ebx is
      * preserved, and that %esp has its original value when
      * accessing the output operands.
      */
     __asm__ volatile (
 	"xchg %%ebx, %1"		"\n\t"
 	"cpuid"				"\n\t"
 	"xchg %%ebx, %1"		"\n\t"
 	: "=a" (*a), "=r" (*b), "=c" (*c), "=d" (*d)
 	: "a" (feature));
 #endif
 #elif defined (_MSC_VER)
     int info[4];
     __cpuid (info, feature);
     *a = info[0];
     *b = info[1];
     *c = info[2];
     *d = info[3];
 #else
 #error Unknown compiler
 #endif
 }
 static cpu_features_t
 detect_cpu_features (void)
 {
     uint32_t a, b, c, d;
     cpu_features_t features = 0;
     if (!have_cpuid())
 	return features;
     /* Get feature bits */
     pixman_cpuid (0x01, &a, &b, &c, &d);
     if (d & (1 << 15))
 	features |= X86_CMOV;
     if (d & (1 << 23))
 	features |= X86_MMX;
     if (d & (1 << 25))
 	features |= X86_SSE;
     if (d & (1 << 26))
 	features |= X86_SSE2;
     /* Check for AMD specific features */
     if ((features & X86_MMX) && !(features & X86_SSE))
     {
 	char vendor[13];
 	/* Get vendor string */
 	memset (vendor, 0, sizeof vendor);
 	pixman_cpuid (0x00, &a, &b, &c, &d);
 	memcpy (vendor + 0, &b, 4);
 	memcpy (vendor + 4, &d, 4);
 	memcpy (vendor + 8, &c, 4);
 	if (strcmp (vendor, "AuthenticAMD") == 0 ||
 	    strcmp (vendor, "Geode by NSC") == 0)
 	{
 	    pixman_cpuid (0x80000000, &a, &b, &c, &d);
 	    if (a >= 0x80000001)
 	    {
 		pixman_cpuid (0x80000001, &a, &b, &c, &d);
 		if (d & (1 << 22))
 		    features |= X86_MMX_EXTENSIONS;
 	    }
 	}
     }
     return features;
 }
 #endif
 static pixman_bool_t
 have_feature (cpu_features_t feature)
 {
     static pixman_bool_t initialized;
     static cpu_features_t features;
     if (!initialized)
     {
 	features = detect_cpu_features();
 	initialized = TRUE;
     }
     return (features & feature) == feature;
 }
 #endif
 pixman_implementation_t *
 _pixman_x86_get_implementations (pixman_implementation_t *imp)
 {
 #define MMX_BITS  (X86_MMX | X86_MMX_EXTENSIONS)
 #define SSE2_BITS (X86_MMX | X86_MMX_EXTENSIONS | X86_SSE | X86_SSE2)
 #ifdef USE_X86_MMX
     if (!_pixman_disabled ("mmx") && have_feature (MMX_BITS))
 	imp = _pixman_implementation_create_mmx (imp);
 #endif
 #ifdef USE_SSE2
     if (!_pixman_disabled ("sse2") && have_feature (SSE2_BITS))
 	imp = _pixman_implementation_create_sse2 (imp);
 #endif
     return imp;
 }

The Tor Browser / annotate

gfx/cairo/libpixman/src/pixman-x86.c@6474c204b198 (annotated)

gfx/cairo/libpixman/src/pixman-x86.c