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328 lines
10 KiB
C++
328 lines
10 KiB
C++
/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is SSE.h
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*
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* The Initial Developer of the Original Code is the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
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* Justin Lebar <justin.lebar@gmail.com>, Mozilla Corporation
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* compile-time and runtime tests for whether to use SSE instructions */
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#ifndef mozilla_SSE_h_
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#define mozilla_SSE_h_
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// for definition of NS_COM_GLUE
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#include "nscore.h"
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/**
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* The public interface of this header consists of a set of macros and
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* functions for Intel CPU features.
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*
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* DETECTING ISA EXTENSIONS
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* ========================
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*
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* This header provides the following functions for determining whether the
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* current CPU supports a particular instruction set extension:
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*
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* mozilla::supports_mmx
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* mozilla::supports_sse
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* mozilla::supports_sse2
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* mozilla::supports_sse3
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* mozilla::supports_ssse3
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* mozilla::supports_sse4a
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* mozilla::supports_sse4_1
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* mozilla::supports_sse4_2
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*
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* If you're writing code using inline assembly, you should guard it with a
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* call to one of these functions. For instance:
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*
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* if (mozilla::supports_sse2()) {
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* asm(" ... ");
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* }
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* else {
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* ...
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* }
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*
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* Note that these functions depend on cpuid intrinsics only available in gcc
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* 4.3 or later and MSVC 8.0 (Visual C++ 2005) or later, so they return false
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* in older compilers. (This could be fixed by replacing the code with inline
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* assembly.)
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*
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*
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* USING INTRINSICS
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* ================
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*
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* This header also provides support for coding using CPU intrinsics.
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*
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* For each mozilla::supports_abc function, we define a MOZILLA_MAY_SUPPORT_ABC
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* macro which indicates that the target/compiler combination we're using is
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* compatible with the ABC extension. For instance, x86_64 with MSVC 2003 is
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* compatible with SSE2 but not SSE3, since although there exist x86_64 CPUs
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* with SSE3 support, MSVC 2003 only supports through SSE2.
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*
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* Until gcc fixes #pragma target [1] [2] or our x86 builds require SSE2,
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* you'll need to separate code using intrinsics into a file separate from your
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* regular code. Here's the recommended pattern:
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*
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* #ifdef MOZILLA_MAY_SUPPORT_ABC
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* namespace mozilla {
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* namespace ABC {
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* void foo();
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* }
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* }
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* #endif
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*
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* void foo() {
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* #ifdef MOZILLA_MAY_SUPPORT_ABC
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* if (mozilla::supports_abc()) {
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* mozilla::ABC::foo(); // in a separate file
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* return;
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* }
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* #endif
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*
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* foo_unvectorized();
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* }
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*
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* You'll need to define mozilla::ABC::foo() in a separate file and add the
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* -mabc flag when using gcc.
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*
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* [1] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39787 and
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* [2] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41201 being fixed.
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*
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*/
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#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
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#ifdef __MMX__
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// It's ok to use MMX instructions based on the -march option (or
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// the default for x86_64 or for Intel Mac).
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#define MOZILLA_PRESUME_MMX 1
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#endif
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#ifdef __SSE__
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// It's ok to use SSE instructions based on the -march option (or
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// the default for x86_64 or for Intel Mac).
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#define MOZILLA_PRESUME_SSE 1
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#endif
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#ifdef __SSE2__
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// It's ok to use SSE2 instructions based on the -march option (or
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// the default for x86_64 or for Intel Mac).
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#define MOZILLA_PRESUME_SSE2 1
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#endif
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#ifdef __SSE3__
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// It's ok to use SSE3 instructions based on the -march option (or the
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// default for Intel Mac).
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#define MOZILLA_PRESUME_SSE3 1
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#endif
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#ifdef __SSSE3__
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// It's ok to use SSSE3 instructions based on the -march option.
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#define MOZILLA_PRESUME_SSSE3 1
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#endif
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#ifdef __SSE4A__
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// It's ok to use SSE4A instructions based on the -march option.
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#define MOZILLA_PRESUME_SSE4A 1
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#endif
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#ifdef __SSE4_1__
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// It's ok to use SSE4.1 instructions based on the -march option.
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#define MOZILLA_PRESUME_SSE4_1 1
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#endif
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#ifdef __SSE4_2__
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// It's ok to use SSE4.2 instructions based on the -march option.
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#define MOZILLA_PRESUME_SSE4_2 1
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#endif
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#ifdef HAVE_CPUID_H
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#define MOZILLA_SSE_HAVE_CPUID_DETECTION
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#endif
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#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_AMD64))
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#if _MSC_VER >= 1400
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// MSVC 2005 or newer on x86 or amd64
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#define MOZILLA_SSE_HAVE_CPUID_DETECTION
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#endif
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#if defined(_M_IX86_FP)
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#if _M_IX86_FP >= 1
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// It's ok to use SSE instructions based on the /arch option
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#define MOZILLA_PRESUME_SSE
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#endif
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#if _M_IX86_FP >= 2
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// It's ok to use SSE2 instructions based on the /arch option
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#define MOZILLA_PRESUME_SSE2
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#endif
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#elif defined(_M_AMD64)
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// MSVC for AMD64 doesn't support MMX, so don't presume it here.
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// SSE is always available on AMD64.
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#define MOZILLA_PRESUME_SSE
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// SSE2 is always available on AMD64.
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#define MOZILLA_PRESUME_SSE2
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#endif
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#elif defined(__SUNPRO_CC) && (defined(__i386) || defined(__x86_64__))
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// Sun Studio on x86 or amd64
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#define MOZILLA_SSE_HAVE_CPUID_DETECTION
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#if defined(__x86_64__)
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// MMX is always available on AMD64.
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#define MOZILLA_PRESUME_MMX
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// SSE is always available on AMD64.
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#define MOZILLA_PRESUME_SSE
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// SSE2 is always available on AMD64.
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#define MOZILLA_PRESUME_SSE2
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#endif
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#endif
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namespace mozilla {
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namespace sse_private {
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#if defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
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#if !defined(MOZILLA_PRESUME_MMX)
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extern bool NS_COM_GLUE mmx_enabled;
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#endif
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#if !defined(MOZILLA_PRESUME_SSE)
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extern bool NS_COM_GLUE sse_enabled;
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#endif
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#if !defined(MOZILLA_PRESUME_SSE2)
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extern bool NS_COM_GLUE sse2_enabled;
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#endif
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#if !defined(MOZILLA_PRESUME_SSE3)
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extern bool NS_COM_GLUE sse3_enabled;
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#endif
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#if !defined(MOZILLA_PRESUME_SSSE3)
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extern bool NS_COM_GLUE ssse3_enabled;
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#endif
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#if !defined(MOZILLA_PRESUME_SSE4A)
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extern bool NS_COM_GLUE sse4a_enabled;
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#endif
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#if !defined(MOZILLA_PRESUME_SSE4_1)
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extern bool NS_COM_GLUE sse4_1_enabled;
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#endif
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#if !defined(MOZILLA_PRESUME_SSE4_2)
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extern bool NS_COM_GLUE sse4_2_enabled;
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#endif
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#endif
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}
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#if defined(MOZILLA_PRESUME_MMX)
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#define MOZILLA_MAY_SUPPORT_MMX 1
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inline bool supports_mmx() { return true; }
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#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
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#if !(defined(_MSC_VER) && defined(_M_AMD64))
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// Define MOZILLA_MAY_SUPPORT_MMX only if we're not on MSVC for
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// AMD64, since that compiler doesn't support MMX.
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#define MOZILLA_MAY_SUPPORT_MMX 1
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#endif
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inline bool supports_mmx() { return sse_private::mmx_enabled; }
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#else
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inline bool supports_mmx() { return false; }
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#endif
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#if defined(MOZILLA_PRESUME_SSE)
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#define MOZILLA_MAY_SUPPORT_SSE 1
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inline bool supports_sse() { return true; }
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#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
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#define MOZILLA_MAY_SUPPORT_SSE 1
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inline bool supports_sse() { return sse_private::sse_enabled; }
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#else
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inline bool supports_sse() { return false; }
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#endif
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#if defined(MOZILLA_PRESUME_SSE2)
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#define MOZILLA_MAY_SUPPORT_SSE2 1
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inline bool supports_sse2() { return true; }
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#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
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#define MOZILLA_MAY_SUPPORT_SSE2 1
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inline bool supports_sse2() { return sse_private::sse2_enabled; }
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#else
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inline bool supports_sse2() { return false; }
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#endif
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#if defined(MOZILLA_PRESUME_SSE3)
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#define MOZILLA_MAY_SUPPORT_SSE3 1
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inline bool supports_sse3() { return true; }
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#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
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#define MOZILLA_MAY_SUPPORT_SSE3 1
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inline bool supports_sse3() { return sse_private::sse3_enabled; }
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#else
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inline bool supports_sse3() { return false; }
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#endif
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#if defined(MOZILLA_PRESUME_SSSE3)
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#define MOZILLA_MAY_SUPPORT_SSSE3 1
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inline bool supports_ssse3() { return true; }
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#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
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#define MOZILLA_MAY_SUPPORT_SSSE3 1
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inline bool supports_ssse3() { return sse_private::ssse3_enabled; }
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#else
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inline bool supports_ssse3() { return false; }
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#endif
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#if defined(MOZILLA_PRESUME_SSE4A)
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#define MOZILLA_MAY_SUPPORT_SSE4A 1
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inline bool supports_sse4a() { return true; }
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#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
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#define MOZILLA_MAY_SUPPORT_SSE4A 1
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inline bool supports_sse4a() { return sse_private::sse4a_enabled; }
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#else
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inline bool supports_sse4a() { return false; }
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#endif
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#if defined(MOZILLA_PRESUME_SSE4_1)
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#define MOZILLA_MAY_SUPPORT_SSE4_1 1
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inline bool supports_sse4_1() { return true; }
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#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
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#define MOZILLA_MAY_SUPPORT_SSE4_1 1
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inline bool supports_sse4_1() { return sse_private::sse4_1_enabled; }
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#else
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inline bool supports_sse4_1() { return false; }
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#endif
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#if defined(MOZILLA_PRESUME_SSE4_2)
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#define MOZILLA_MAY_SUPPORT_SSE4_2 1
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inline bool supports_sse4_2() { return true; }
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#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
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#define MOZILLA_MAY_SUPPORT_SSE4_2 1
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inline bool supports_sse4_2() { return sse_private::sse4_2_enabled; }
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#else
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inline bool supports_sse4_2() { return false; }
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#endif
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}
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#endif /* !defined(mozilla_SSE_h_) */
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