mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-31 22:25:30 +00:00
85bccc71ae
--HG-- rename : xpcom/glue/SSE.cpp => mozglue/build/SSE.cpp rename : xpcom/glue/SSE.h => mozglue/build/SSE.h rename : xpcom/glue/arm.cpp => mozglue/build/arm.cpp rename : xpcom/glue/arm.h => mozglue/build/arm.h rename : xpcom/tests/ShowSSEConfig.cpp => mozglue/tests/ShowSSEConfig.cpp
292 lines
8.6 KiB
C++
292 lines
8.6 KiB
C++
/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
|
|
/* 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
|
|
*
|
|
* 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 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
|
|
#endif
|
|
}
|
|
|
|
#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
|
|
|
|
}
|
|
|
|
#endif /* !defined(mozilla_SSE_h_) */
|