| /* |
| * Copyright (c) 2010 The VP8 project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license and patent |
| * grant that can be found in the LICENSE file in the root of the source |
| * tree. All contributing project authors may be found in the AUTHORS |
| * file in the root of the source tree. |
| */ |
| |
| |
| #ifndef VPX_PORTS_X86_H |
| #define VPX_PORTS_X86_H |
| #include <stdlib.h> |
| #include "config.h" |
| |
| #if defined(__GNUC__) && __GNUC__ |
| #if ARCH_X86_64 |
| #define cpuid(func,ax,bx,cx,dx)\ |
| __asm__ __volatile__ (\ |
| "cpuid \n\t" \ |
| : "=a" (ax), "=b" (bx), "=c" (cx), "=d" (dx) \ |
| : "a" (func)); |
| #else |
| #define cpuid(func,ax,bx,cx,dx)\ |
| __asm__ __volatile__ (\ |
| "pushl %%ebx \n\t" \ |
| "cpuid \n\t" \ |
| "movl %%ebx, %1 \n\t" \ |
| "popl %%ebx \n\t" \ |
| : "=a" (ax), "=r" (bx), "=c" (cx), "=d" (dx) \ |
| : "a" (func)); |
| #endif |
| #else |
| #if ARCH_X86_64 |
| void __cpuid(int CPUInfo[4], int info_type); |
| #pragma intrinsic(__cpuid) |
| #define cpuid(func,a,b,c,d) do{\ |
| int regs[4];\ |
| __cpuid(regs,func); a=regs[0]; b=regs[1]; c=regs[2]; d=regs[3];\ |
| } while(0) |
| #else |
| #define cpuid(func,a,b,c,d)\ |
| __asm mov eax, func\ |
| __asm cpuid\ |
| __asm mov a, eax\ |
| __asm mov b, ebx\ |
| __asm mov c, ecx\ |
| __asm mov d, edx |
| #endif |
| #endif |
| |
| #define HAS_MMX 0x01 |
| #define HAS_SSE 0x02 |
| #define HAS_SSE2 0x04 |
| #define HAS_SSE3 0x08 |
| #define HAS_SSSE3 0x10 |
| #ifndef BIT |
| #define BIT(n) (1<<n) |
| #endif |
| |
| static int |
| x86_simd_caps(void) |
| { |
| unsigned int flags = 0; |
| unsigned int mask = ~0; |
| unsigned int reg_eax, reg_ebx, reg_ecx, reg_edx; |
| char *env; |
| (void)reg_ebx; |
| |
| /* See if the CPU capabilities are being overridden by the environment */ |
| env = getenv("VPX_SIMD_CAPS"); |
| |
| if (env && *env) |
| return (int)strtol(env, NULL, 0); |
| |
| env = getenv("VPX_SIMD_CAPS_MASK"); |
| |
| if (env && *env) |
| mask = strtol(env, NULL, 0); |
| |
| /* Ensure that the CPUID instruction supports extended features */ |
| cpuid(0, reg_eax, reg_ebx, reg_ecx, reg_edx); |
| |
| if (reg_eax < 1) |
| return 0; |
| |
| /* Get the standard feature flags */ |
| cpuid(1, reg_eax, reg_ebx, reg_ecx, reg_edx); |
| |
| if (reg_edx & BIT(23)) flags |= HAS_MMX; |
| |
| if (reg_edx & BIT(25)) flags |= HAS_SSE; /* aka xmm */ |
| |
| if (reg_edx & BIT(26)) flags |= HAS_SSE2; /* aka wmt */ |
| |
| if (reg_ecx & BIT(0)) flags |= HAS_SSE3; |
| |
| if (reg_ecx & BIT(9)) flags |= HAS_SSSE3; |
| |
| return flags & mask; |
| } |
| |
| |
| #if ARCH_X86_64 && defined(_MSC_VER) |
| unsigned __int64 __rdtsc(void); |
| #pragma intrinsic(__rdtsc) |
| #endif |
| static unsigned int |
| x86_readtsc(void) |
| { |
| #if defined(__GNUC__) && __GNUC__ |
| unsigned int tsc; |
| __asm__ __volatile__("rdtsc\n\t":"=a"(tsc):); |
| return tsc; |
| #else |
| #if ARCH_X86_64 |
| return __rdtsc(); |
| #else |
| __asm rdtsc; |
| #endif |
| #endif |
| } |
| |
| |
| #if defined(__GNUC__) && __GNUC__ |
| #define x86_pause_hint()\ |
| __asm__ __volatile__ ("pause \n\t") |
| #else |
| #if ARCH_X86_64 |
| /* No pause intrinsic for windows x64 */ |
| #define x86_pause_hint() |
| #else |
| #define x86_pause_hint()\ |
| __asm pause |
| #endif |
| #endif |
| |
| #if defined(__GNUC__) && __GNUC__ |
| static void |
| x87_set_control_word(unsigned short mode) |
| { |
| __asm__ __volatile__("fldcw %0" : : "m"(*&mode)); |
| } |
| static unsigned short |
| x87_get_control_word(void) |
| { |
| unsigned short mode; |
| __asm__ __volatile__("fstcw %0\n\t":"=m"(*&mode):); |
| return mode; |
| } |
| #elif ARCH_X86_64 |
| /* No fldcw intrinsics on Windows x64, punt to external asm */ |
| extern void vpx_winx64_fldcw(unsigned short mode); |
| extern unsigned short vpx_winx64_fstcw(void); |
| #define x87_set_control_word vpx_winx64_fldcw |
| #define x87_get_control_word vpx_winx64_fstcw |
| #else |
| static void |
| x87_set_control_word(unsigned short mode) |
| { |
| __asm { fldcw mode } |
| } |
| static unsigned short |
| x87_get_control_word(void) |
| { |
| unsigned short mode; |
| __asm { fstcw mode } |
| return mode; |
| } |
| #endif |
| |
| static unsigned short |
| x87_set_double_precision(void) |
| { |
| unsigned short mode = x87_get_control_word(); |
| x87_set_control_word((mode&~0x300) | 0x200); |
| return mode; |
| } |
| |
| |
| extern void vpx_reset_mmx_state(void); |
| #endif |
| |