mirror of
https://github.com/mozilla/gecko-dev.git
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175 lines
5.4 KiB
C++
175 lines
5.4 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* compile-time and runtime tests for whether to use SSE instructions */
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#ifndef mozilla_arm_h_
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#define mozilla_arm_h_
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// for definition of NS_COM_GLUE
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#include "nscore.h"
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/* This is patterned after SSE.h, but provides ARMv5E, ARMv6, and NEON
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detection. For reasons similar to the SSE code, code using NEON (even just
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in inline asm) needs to be in a separate compilation unit from the regular
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code, because it requires an ".fpu neon" directive which can't be undone.
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ARMv5E and ARMv6 code may also require an .arch directive, since by default
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the assembler refuses to generate code for opcodes outside of its current
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.arch setting.
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TODO: Add Thumb, Thumb2, VFP, iwMMX, etc. detection, if we need it. */
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#if defined(__GNUC__) && defined(__arm__)
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# define MOZILLA_ARM_ARCH 3
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# if defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) \
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|| defined(_ARM_ARCH_4)
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# undef MOZILLA_ARM_ARCH
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# define MOZILLA_ARM_ARCH 4
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# endif
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# if defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) \
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|| defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) \
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|| defined(__ARM_ARCH_5TEJ__) || defined(_ARM_ARCH_5)
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# undef MOZILLA_ARM_ARCH
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# define MOZILLA_ARM_ARCH 5
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# endif
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# if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
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|| defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \
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|| defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) \
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|| defined(__ARM_ARCH_6M__) || defined(_ARM_ARCH_6)
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# undef MOZILLA_ARM_ARCH
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# define MOZILLA_ARM_ARCH 6
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# endif
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# if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
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|| defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \
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|| defined(__ARM_ARCH_7EM__) || defined(_ARM_ARCH_7)
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# undef MOZILLA_ARM_ARCH
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# define MOZILLA_ARM_ARCH 7
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# endif
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# if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
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# define MOZILLA_MAY_SUPPORT_EDSP 1
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# endif
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# if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
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# if defined(HAVE_ARM_SIMD)
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# define MOZILLA_MAY_SUPPORT_ARMV6 1
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# endif
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# endif
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// Technically 4.2.x only works in the CodeSourcery releases, but I don't
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// know how to detect those separately from mainline gcc (which got support
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// in 4.3). The Maemo version 5 SDK shipped with the CodeSourcery 4.2.1
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// release, which we need to work.
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# if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2)
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# if defined(HAVE_ARM_NEON)
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# define MOZILLA_MAY_SUPPORT_NEON 1
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# endif
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# endif
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// ARMv7 support was merged in gcc 4.3.
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# if __GNUC__> 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
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# if defined(HAVE_ARM_SIMD)
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# define MOZILLA_MAY_SUPPORT_ARMV7 1
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# endif
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# endif
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// When using -mfpu=neon, gcc generates neon instructions.
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# if defined(__ARM_NEON__)
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# define MOZILLA_PRESUME_NEON 1
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# endif
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// Currently we only have CPU detection for Linux via /proc/cpuinfo
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# if defined(__linux__) || defined(ANDROID)
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# define MOZILLA_ARM_HAVE_CPUID_DETECTION 1
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# endif
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#elif defined(_MSC_VER) && defined(_M_ARM)
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# define MOZILLA_ARM_HAVE_CPUID_DETECTION 1
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// _M_ARM on MSVC has current cpu architecture.
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# define MOZILLA_ARM_ARCH _M_ARM
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// MSVC only allows external asm for ARM, so we don't have to rely on
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// compiler support.
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# define MOZILLA_MAY_SUPPORT_EDSP 1
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# if defined(HAVE_ARM_SIMD)
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# define MOZILLA_MAY_SUPPORT_ARMV6 1
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# define MOZILLA_MAY_SUPPORT_ARMV7 1
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# endif
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# if defined(HAVE_ARM_NEON)
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# define MOZILLA_MAY_SUPPORT_NEON 1
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# endif
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#endif
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namespace mozilla {
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namespace arm_private {
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#if defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
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#if !defined(MOZILLA_PRESUME_EDSP)
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extern bool NS_COM_GLUE edsp_enabled;
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#endif
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#if !defined(MOZILLA_PRESUME_ARMV6)
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extern bool NS_COM_GLUE armv6_enabled;
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#endif
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#if !defined(MOZILLA_PRESUME_ARMV7)
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extern bool NS_COM_GLUE armv7_enabled;
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#endif
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#if !defined(MOZILLA_PRESUME_NEON)
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extern bool NS_COM_GLUE neon_enabled;
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#endif
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#endif
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}
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#if defined(MOZILLA_PRESUME_EDSP)
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# define MOZILLA_MAY_SUPPORT_EDSP 1
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inline bool supports_edsp() { return true; }
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#elif defined(MOZILLA_MAY_SUPPORT_EDSP) \
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&& defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
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inline bool supports_edsp() { return arm_private::edsp_enabled; }
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#else
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inline bool supports_edsp() { return false; }
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#endif
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#if defined(MOZILLA_PRESUME_ARMV6)
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# define MOZILLA_MAY_SUPPORT_ARMV6 1
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inline bool supports_armv6() { return true; }
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#elif defined(MOZILLA_MAY_SUPPORT_ARMV6) \
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&& defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
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inline bool supports_armv6() { return arm_private::armv6_enabled; }
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#else
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inline bool supports_armv6() { return false; }
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#endif
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#if defined(MOZILLA_PRESUME_ARMV7)
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# define MOZILLA_MAY_SUPPORT_ARMV7 1
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inline bool supports_armv7() { return true; }
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#elif defined(MOZILLA_MAY_SUPPORT_ARMV7) \
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&& defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
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inline bool supports_armv7() { return arm_private::armv7_enabled; }
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#else
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inline bool supports_armv7() { return false; }
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#endif
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#if defined(MOZILLA_PRESUME_NEON)
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# define MOZILLA_MAY_SUPPORT_NEON 1
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inline bool supports_neon() { return true; }
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#elif defined(MOZILLA_MAY_SUPPORT_NEON) \
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&& defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
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inline bool supports_neon() { return arm_private::neon_enabled; }
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#else
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inline bool supports_neon() { return false; }
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#endif
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}
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#endif /* !defined(mozilla_arm_h_) */
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