/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ /* compile-time and runtime tests for whether to use SSE instructions */ #ifndef mozilla_SSE_h_ #define mozilla_SSE_h_ // for definition of MFBT_DATA #include "mozilla/Types.h" /** * The public interface of this header consists of a set of macros and * functions for Intel CPU features. * * DETECTING ISA EXTENSIONS * ======================== * * This header provides the following functions for determining whether the * current CPU supports a particular instruction set extension: * * mozilla::supports_mmx * mozilla::supports_sse * mozilla::supports_sse2 * mozilla::supports_sse3 * mozilla::supports_ssse3 * mozilla::supports_sse4a * mozilla::supports_sse4_1 * mozilla::supports_sse4_2 * mozilla::supports_avx * mozilla::supports_avx2 * * If you're writing code using inline assembly, you should guard it with a * call to one of these functions. For instance: * * if (mozilla::supports_sse2()) { * asm(" ... "); * } * else { * ... * } * * Note that these functions depend on cpuid intrinsics only available in gcc * 4.3 or later and MSVC 8.0 (Visual C++ 2005) or later, so they return false * in older compilers. (This could be fixed by replacing the code with inline * assembly.) * * * USING INTRINSICS * ================ * * This header also provides support for coding using CPU intrinsics. * * For each mozilla::supports_abc function, we define a MOZILLA_MAY_SUPPORT_ABC * macro which indicates that the target/compiler combination we're using is * compatible with the ABC extension. For instance, x86_64 with MSVC 2003 is * compatible with SSE2 but not SSE3, since although there exist x86_64 CPUs * with SSE3 support, MSVC 2003 only supports through SSE2. * * Until gcc fixes #pragma target [1] [2] or our x86 builds require SSE2, * you'll need to separate code using intrinsics into a file separate from your * regular code. Here's the recommended pattern: * * #ifdef MOZILLA_MAY_SUPPORT_ABC * namespace mozilla { * namespace ABC { * void foo(); * } * } * #endif * * void foo() { * #ifdef MOZILLA_MAY_SUPPORT_ABC * if (mozilla::supports_abc()) { * mozilla::ABC::foo(); // in a separate file * return; * } * #endif * * foo_unvectorized(); * } * * You'll need to define mozilla::ABC::foo() in a separate file and add the * -mabc flag when using gcc. * * [1] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39787 and * [2] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41201 being fixed. * */ #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) #ifdef __MMX__ // It's ok to use MMX instructions based on the -march option (or // the default for x86_64 or for Intel Mac). #define MOZILLA_PRESUME_MMX 1 #endif #ifdef __SSE__ // It's ok to use SSE instructions based on the -march option (or // the default for x86_64 or for Intel Mac). #define MOZILLA_PRESUME_SSE 1 #endif #ifdef __SSE2__ // It's ok to use SSE2 instructions based on the -march option (or // the default for x86_64 or for Intel Mac). #define MOZILLA_PRESUME_SSE2 1 #endif #ifdef __SSE3__ // It's ok to use SSE3 instructions based on the -march option (or the // default for Intel Mac). #define MOZILLA_PRESUME_SSE3 1 #endif #ifdef __SSSE3__ // It's ok to use SSSE3 instructions based on the -march option. #define MOZILLA_PRESUME_SSSE3 1 #endif #ifdef __SSE4A__ // It's ok to use SSE4A instructions based on the -march option. #define MOZILLA_PRESUME_SSE4A 1 #endif #ifdef __SSE4_1__ // It's ok to use SSE4.1 instructions based on the -march option. #define MOZILLA_PRESUME_SSE4_1 1 #endif #ifdef __SSE4_2__ // It's ok to use SSE4.2 instructions based on the -march option. #define MOZILLA_PRESUME_SSE4_2 1 #endif #ifdef __AVX__ // It's ok to use AVX instructions based on the -march option. #define MOZILLA_PRESUME_AVX 1 #endif #ifdef __AVX2__ // It's ok to use AVX instructions based on the -march option. #define MOZILLA_PRESUME_AVX2 1 #endif #ifdef HAVE_CPUID_H #define MOZILLA_SSE_HAVE_CPUID_DETECTION #endif #elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_AMD64)) #define MOZILLA_SSE_HAVE_CPUID_DETECTION #if defined(_M_IX86_FP) #if _M_IX86_FP >= 1 // It's ok to use SSE instructions based on the /arch option #define MOZILLA_PRESUME_SSE #endif #if _M_IX86_FP >= 2 // It's ok to use SSE2 instructions based on the /arch option #define MOZILLA_PRESUME_SSE2 #endif #elif defined(_M_AMD64) // MSVC for AMD64 doesn't support MMX, so don't presume it here. // SSE is always available on AMD64. #define MOZILLA_PRESUME_SSE // SSE2 is always available on AMD64. #define MOZILLA_PRESUME_SSE2 #endif #elif defined(__SUNPRO_CC) && (defined(__i386) || defined(__x86_64__)) // Sun Studio on x86 or amd64 #define MOZILLA_SSE_HAVE_CPUID_DETECTION #if defined(__x86_64__) // MMX is always available on AMD64. #define MOZILLA_PRESUME_MMX // SSE is always available on AMD64. #define MOZILLA_PRESUME_SSE // SSE2 is always available on AMD64. #define MOZILLA_PRESUME_SSE2 #endif #endif namespace mozilla { namespace sse_private { #if defined(MOZILLA_SSE_HAVE_CPUID_DETECTION) #if !defined(MOZILLA_PRESUME_MMX) extern bool MFBT_DATA mmx_enabled; #endif #if !defined(MOZILLA_PRESUME_SSE) extern bool MFBT_DATA sse_enabled; #endif #if !defined(MOZILLA_PRESUME_SSE2) extern bool MFBT_DATA sse2_enabled; #endif #if !defined(MOZILLA_PRESUME_SSE3) extern bool MFBT_DATA sse3_enabled; #endif #if !defined(MOZILLA_PRESUME_SSSE3) extern bool MFBT_DATA ssse3_enabled; #endif #if !defined(MOZILLA_PRESUME_SSE4A) extern bool MFBT_DATA sse4a_enabled; #endif #if !defined(MOZILLA_PRESUME_SSE4_1) extern bool MFBT_DATA sse4_1_enabled; #endif #if !defined(MOZILLA_PRESUME_SSE4_2) extern bool MFBT_DATA sse4_2_enabled; #endif #if !defined(MOZILLA_PRESUME_AVX) extern bool MFBT_DATA avx_enabled; #endif #if !defined(MOZILLA_PRESUME_AVX2) extern bool MFBT_DATA avx2_enabled; #endif #endif } // namespace sse_private #if defined(MOZILLA_PRESUME_MMX) #define MOZILLA_MAY_SUPPORT_MMX 1 inline bool supports_mmx() { return true; } #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION) #if !(defined(_MSC_VER) && defined(_M_AMD64)) // Define MOZILLA_MAY_SUPPORT_MMX only if we're not on MSVC for // AMD64, since that compiler doesn't support MMX. #define MOZILLA_MAY_SUPPORT_MMX 1 #endif inline bool supports_mmx() { return sse_private::mmx_enabled; } #else inline bool supports_mmx() { return false; } #endif #if defined(MOZILLA_PRESUME_SSE) #define MOZILLA_MAY_SUPPORT_SSE 1 inline bool supports_sse() { return true; } #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION) #define MOZILLA_MAY_SUPPORT_SSE 1 inline bool supports_sse() { return sse_private::sse_enabled; } #else inline bool supports_sse() { return false; } #endif #if defined(MOZILLA_PRESUME_SSE2) #define MOZILLA_MAY_SUPPORT_SSE2 1 inline bool supports_sse2() { return true; } #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION) #define MOZILLA_MAY_SUPPORT_SSE2 1 inline bool supports_sse2() { return sse_private::sse2_enabled; } #else inline bool supports_sse2() { return false; } #endif #if defined(MOZILLA_PRESUME_SSE3) #define MOZILLA_MAY_SUPPORT_SSE3 1 inline bool supports_sse3() { return true; } #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION) #define MOZILLA_MAY_SUPPORT_SSE3 1 inline bool supports_sse3() { return sse_private::sse3_enabled; } #else inline bool supports_sse3() { return false; } #endif #if defined(MOZILLA_PRESUME_SSSE3) #define MOZILLA_MAY_SUPPORT_SSSE3 1 inline bool supports_ssse3() { return true; } #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION) #define MOZILLA_MAY_SUPPORT_SSSE3 1 inline bool supports_ssse3() { return sse_private::ssse3_enabled; } #else inline bool supports_ssse3() { return false; } #endif #if defined(MOZILLA_PRESUME_SSE4A) #define MOZILLA_MAY_SUPPORT_SSE4A 1 inline bool supports_sse4a() { return true; } #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION) #define MOZILLA_MAY_SUPPORT_SSE4A 1 inline bool supports_sse4a() { return sse_private::sse4a_enabled; } #else inline bool supports_sse4a() { return false; } #endif #if defined(MOZILLA_PRESUME_SSE4_1) #define MOZILLA_MAY_SUPPORT_SSE4_1 1 inline bool supports_sse4_1() { return true; } #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION) #define MOZILLA_MAY_SUPPORT_SSE4_1 1 inline bool supports_sse4_1() { return sse_private::sse4_1_enabled; } #else inline bool supports_sse4_1() { return false; } #endif #if defined(MOZILLA_PRESUME_SSE4_2) #define MOZILLA_MAY_SUPPORT_SSE4_2 1 inline bool supports_sse4_2() { return true; } #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION) #define MOZILLA_MAY_SUPPORT_SSE4_2 1 inline bool supports_sse4_2() { return sse_private::sse4_2_enabled; } #else inline bool supports_sse4_2() { return false; } #endif #if defined(MOZILLA_PRESUME_AVX) #define MOZILLA_MAY_SUPPORT_AVX 1 inline bool supports_avx() { return true; } #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION) #define MOZILLA_MAY_SUPPORT_AVX 1 inline bool supports_avx() { return sse_private::avx_enabled; } #else inline bool supports_avx() { return false; } #endif #if defined(MOZILLA_PRESUME_AVX2) #define MOZILLA_MAY_SUPPORT_AVX2 1 inline bool supports_avx2() { return true; } #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION) #define MOZILLA_MAY_SUPPORT_AVX2 1 inline bool supports_avx2() { return sse_private::avx2_enabled; } #else inline bool supports_avx2() { return false; } #endif } // namespace mozilla #endif /* !defined(mozilla_SSE_h_) */