1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mozglue/build/SSE.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,291 @@
1.4 +/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +/* compile-time and runtime tests for whether to use SSE instructions */
1.10 +
1.11 +#ifndef mozilla_SSE_h_
1.12 +#define mozilla_SSE_h_
1.13 +
1.14 +// for definition of MFBT_DATA
1.15 +#include "mozilla/Types.h"
1.16 +
1.17 +/**
1.18 + * The public interface of this header consists of a set of macros and
1.19 + * functions for Intel CPU features.
1.20 + *
1.21 + * DETECTING ISA EXTENSIONS
1.22 + * ========================
1.23 + *
1.24 + * This header provides the following functions for determining whether the
1.25 + * current CPU supports a particular instruction set extension:
1.26 + *
1.27 + * mozilla::supports_mmx
1.28 + * mozilla::supports_sse
1.29 + * mozilla::supports_sse2
1.30 + * mozilla::supports_sse3
1.31 + * mozilla::supports_ssse3
1.32 + * mozilla::supports_sse4a
1.33 + * mozilla::supports_sse4_1
1.34 + * mozilla::supports_sse4_2
1.35 + *
1.36 + * If you're writing code using inline assembly, you should guard it with a
1.37 + * call to one of these functions. For instance:
1.38 + *
1.39 + * if (mozilla::supports_sse2()) {
1.40 + * asm(" ... ");
1.41 + * }
1.42 + * else {
1.43 + * ...
1.44 + * }
1.45 + *
1.46 + * Note that these functions depend on cpuid intrinsics only available in gcc
1.47 + * 4.3 or later and MSVC 8.0 (Visual C++ 2005) or later, so they return false
1.48 + * in older compilers. (This could be fixed by replacing the code with inline
1.49 + * assembly.)
1.50 + *
1.51 + *
1.52 + * USING INTRINSICS
1.53 + * ================
1.54 + *
1.55 + * This header also provides support for coding using CPU intrinsics.
1.56 + *
1.57 + * For each mozilla::supports_abc function, we define a MOZILLA_MAY_SUPPORT_ABC
1.58 + * macro which indicates that the target/compiler combination we're using is
1.59 + * compatible with the ABC extension. For instance, x86_64 with MSVC 2003 is
1.60 + * compatible with SSE2 but not SSE3, since although there exist x86_64 CPUs
1.61 + * with SSE3 support, MSVC 2003 only supports through SSE2.
1.62 + *
1.63 + * Until gcc fixes #pragma target [1] [2] or our x86 builds require SSE2,
1.64 + * you'll need to separate code using intrinsics into a file separate from your
1.65 + * regular code. Here's the recommended pattern:
1.66 + *
1.67 + * #ifdef MOZILLA_MAY_SUPPORT_ABC
1.68 + * namespace mozilla {
1.69 + * namespace ABC {
1.70 + * void foo();
1.71 + * }
1.72 + * }
1.73 + * #endif
1.74 + *
1.75 + * void foo() {
1.76 + * #ifdef MOZILLA_MAY_SUPPORT_ABC
1.77 + * if (mozilla::supports_abc()) {
1.78 + * mozilla::ABC::foo(); // in a separate file
1.79 + * return;
1.80 + * }
1.81 + * #endif
1.82 + *
1.83 + * foo_unvectorized();
1.84 + * }
1.85 + *
1.86 + * You'll need to define mozilla::ABC::foo() in a separate file and add the
1.87 + * -mabc flag when using gcc.
1.88 + *
1.89 + * [1] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39787 and
1.90 + * [2] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41201 being fixed.
1.91 + *
1.92 + */
1.93 +
1.94 +#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
1.95 +
1.96 +#ifdef __MMX__
1.97 + // It's ok to use MMX instructions based on the -march option (or
1.98 + // the default for x86_64 or for Intel Mac).
1.99 + #define MOZILLA_PRESUME_MMX 1
1.100 +#endif
1.101 +#ifdef __SSE__
1.102 + // It's ok to use SSE instructions based on the -march option (or
1.103 + // the default for x86_64 or for Intel Mac).
1.104 + #define MOZILLA_PRESUME_SSE 1
1.105 +#endif
1.106 +#ifdef __SSE2__
1.107 + // It's ok to use SSE2 instructions based on the -march option (or
1.108 + // the default for x86_64 or for Intel Mac).
1.109 + #define MOZILLA_PRESUME_SSE2 1
1.110 +#endif
1.111 +#ifdef __SSE3__
1.112 + // It's ok to use SSE3 instructions based on the -march option (or the
1.113 + // default for Intel Mac).
1.114 + #define MOZILLA_PRESUME_SSE3 1
1.115 +#endif
1.116 +#ifdef __SSSE3__
1.117 + // It's ok to use SSSE3 instructions based on the -march option.
1.118 + #define MOZILLA_PRESUME_SSSE3 1
1.119 +#endif
1.120 +#ifdef __SSE4A__
1.121 + // It's ok to use SSE4A instructions based on the -march option.
1.122 + #define MOZILLA_PRESUME_SSE4A 1
1.123 +#endif
1.124 +#ifdef __SSE4_1__
1.125 + // It's ok to use SSE4.1 instructions based on the -march option.
1.126 + #define MOZILLA_PRESUME_SSE4_1 1
1.127 +#endif
1.128 +#ifdef __SSE4_2__
1.129 + // It's ok to use SSE4.2 instructions based on the -march option.
1.130 + #define MOZILLA_PRESUME_SSE4_2 1
1.131 +#endif
1.132 +
1.133 +#ifdef HAVE_CPUID_H
1.134 + #define MOZILLA_SSE_HAVE_CPUID_DETECTION
1.135 +#endif
1.136 +
1.137 +#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_AMD64))
1.138 +
1.139 +#define MOZILLA_SSE_HAVE_CPUID_DETECTION
1.140 +
1.141 +#if defined(_M_IX86_FP)
1.142 +
1.143 +#if _M_IX86_FP >= 1
1.144 + // It's ok to use SSE instructions based on the /arch option
1.145 + #define MOZILLA_PRESUME_SSE
1.146 +#endif
1.147 +#if _M_IX86_FP >= 2
1.148 + // It's ok to use SSE2 instructions based on the /arch option
1.149 + #define MOZILLA_PRESUME_SSE2
1.150 +#endif
1.151 +
1.152 +#elif defined(_M_AMD64)
1.153 + // MSVC for AMD64 doesn't support MMX, so don't presume it here.
1.154 +
1.155 + // SSE is always available on AMD64.
1.156 + #define MOZILLA_PRESUME_SSE
1.157 + // SSE2 is always available on AMD64.
1.158 + #define MOZILLA_PRESUME_SSE2
1.159 +#endif
1.160 +
1.161 +#elif defined(__SUNPRO_CC) && (defined(__i386) || defined(__x86_64__))
1.162 +// Sun Studio on x86 or amd64
1.163 +
1.164 +#define MOZILLA_SSE_HAVE_CPUID_DETECTION
1.165 +
1.166 +#if defined(__x86_64__)
1.167 + // MMX is always available on AMD64.
1.168 + #define MOZILLA_PRESUME_MMX
1.169 + // SSE is always available on AMD64.
1.170 + #define MOZILLA_PRESUME_SSE
1.171 + // SSE2 is always available on AMD64.
1.172 + #define MOZILLA_PRESUME_SSE2
1.173 +#endif
1.174 +
1.175 +#endif
1.176 +
1.177 +namespace mozilla {
1.178 +
1.179 + namespace sse_private {
1.180 +#if defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
1.181 +#if !defined(MOZILLA_PRESUME_MMX)
1.182 + extern bool MFBT_DATA mmx_enabled;
1.183 +#endif
1.184 +#if !defined(MOZILLA_PRESUME_SSE)
1.185 + extern bool MFBT_DATA sse_enabled;
1.186 +#endif
1.187 +#if !defined(MOZILLA_PRESUME_SSE2)
1.188 + extern bool MFBT_DATA sse2_enabled;
1.189 +#endif
1.190 +#if !defined(MOZILLA_PRESUME_SSE3)
1.191 + extern bool MFBT_DATA sse3_enabled;
1.192 +#endif
1.193 +#if !defined(MOZILLA_PRESUME_SSSE3)
1.194 + extern bool MFBT_DATA ssse3_enabled;
1.195 +#endif
1.196 +#if !defined(MOZILLA_PRESUME_SSE4A)
1.197 + extern bool MFBT_DATA sse4a_enabled;
1.198 +#endif
1.199 +#if !defined(MOZILLA_PRESUME_SSE4_1)
1.200 + extern bool MFBT_DATA sse4_1_enabled;
1.201 +#endif
1.202 +#if !defined(MOZILLA_PRESUME_SSE4_2)
1.203 + extern bool MFBT_DATA sse4_2_enabled;
1.204 +#endif
1.205 +#endif
1.206 + }
1.207 +
1.208 +#if defined(MOZILLA_PRESUME_MMX)
1.209 +#define MOZILLA_MAY_SUPPORT_MMX 1
1.210 + inline bool supports_mmx() { return true; }
1.211 +#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
1.212 +#if !(defined(_MSC_VER) && defined(_M_AMD64))
1.213 + // Define MOZILLA_MAY_SUPPORT_MMX only if we're not on MSVC for
1.214 + // AMD64, since that compiler doesn't support MMX.
1.215 +#define MOZILLA_MAY_SUPPORT_MMX 1
1.216 +#endif
1.217 + inline bool supports_mmx() { return sse_private::mmx_enabled; }
1.218 +#else
1.219 + inline bool supports_mmx() { return false; }
1.220 +#endif
1.221 +
1.222 +#if defined(MOZILLA_PRESUME_SSE)
1.223 +#define MOZILLA_MAY_SUPPORT_SSE 1
1.224 + inline bool supports_sse() { return true; }
1.225 +#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
1.226 +#define MOZILLA_MAY_SUPPORT_SSE 1
1.227 + inline bool supports_sse() { return sse_private::sse_enabled; }
1.228 +#else
1.229 + inline bool supports_sse() { return false; }
1.230 +#endif
1.231 +
1.232 +#if defined(MOZILLA_PRESUME_SSE2)
1.233 +#define MOZILLA_MAY_SUPPORT_SSE2 1
1.234 + inline bool supports_sse2() { return true; }
1.235 +#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
1.236 +#define MOZILLA_MAY_SUPPORT_SSE2 1
1.237 + inline bool supports_sse2() { return sse_private::sse2_enabled; }
1.238 +#else
1.239 + inline bool supports_sse2() { return false; }
1.240 +#endif
1.241 +
1.242 +#if defined(MOZILLA_PRESUME_SSE3)
1.243 +#define MOZILLA_MAY_SUPPORT_SSE3 1
1.244 + inline bool supports_sse3() { return true; }
1.245 +#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
1.246 +#define MOZILLA_MAY_SUPPORT_SSE3 1
1.247 + inline bool supports_sse3() { return sse_private::sse3_enabled; }
1.248 +#else
1.249 + inline bool supports_sse3() { return false; }
1.250 +#endif
1.251 +
1.252 +#if defined(MOZILLA_PRESUME_SSSE3)
1.253 +#define MOZILLA_MAY_SUPPORT_SSSE3 1
1.254 + inline bool supports_ssse3() { return true; }
1.255 +#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
1.256 +#define MOZILLA_MAY_SUPPORT_SSSE3 1
1.257 + inline bool supports_ssse3() { return sse_private::ssse3_enabled; }
1.258 +#else
1.259 + inline bool supports_ssse3() { return false; }
1.260 +#endif
1.261 +
1.262 +#if defined(MOZILLA_PRESUME_SSE4A)
1.263 +#define MOZILLA_MAY_SUPPORT_SSE4A 1
1.264 + inline bool supports_sse4a() { return true; }
1.265 +#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
1.266 +#define MOZILLA_MAY_SUPPORT_SSE4A 1
1.267 + inline bool supports_sse4a() { return sse_private::sse4a_enabled; }
1.268 +#else
1.269 + inline bool supports_sse4a() { return false; }
1.270 +#endif
1.271 +
1.272 +#if defined(MOZILLA_PRESUME_SSE4_1)
1.273 +#define MOZILLA_MAY_SUPPORT_SSE4_1 1
1.274 + inline bool supports_sse4_1() { return true; }
1.275 +#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
1.276 +#define MOZILLA_MAY_SUPPORT_SSE4_1 1
1.277 + inline bool supports_sse4_1() { return sse_private::sse4_1_enabled; }
1.278 +#else
1.279 + inline bool supports_sse4_1() { return false; }
1.280 +#endif
1.281 +
1.282 +#if defined(MOZILLA_PRESUME_SSE4_2)
1.283 +#define MOZILLA_MAY_SUPPORT_SSE4_2 1
1.284 + inline bool supports_sse4_2() { return true; }
1.285 +#elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
1.286 +#define MOZILLA_MAY_SUPPORT_SSE4_2 1
1.287 + inline bool supports_sse4_2() { return sse_private::sse4_2_enabled; }
1.288 +#else
1.289 + inline bool supports_sse4_2() { return false; }
1.290 +#endif
1.291 +
1.292 +}
1.293 +
1.294 +#endif /* !defined(mozilla_SSE_h_) */
