michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /* compile-time and runtime tests for whether to use SSE instructions */
michael@0: 
michael@0: #ifndef mozilla_arm_h_
michael@0: #define mozilla_arm_h_
michael@0: 
michael@0: // for definition of MFBT_DATA
michael@0: #include "mozilla/Types.h"
michael@0: 
michael@0: /* This is patterned after SSE.h, but provides ARMv5E, ARMv6, and NEON
michael@0:    detection. For reasons similar to the SSE code, code using NEON (even just
michael@0:    in inline asm) needs to be in a separate compilation unit from the regular
michael@0:    code, because it requires an ".fpu neon" directive which can't be undone.
michael@0:    ARMv5E and ARMv6 code may also require an .arch directive, since by default
michael@0:    the assembler refuses to generate code for opcodes outside of its current
michael@0:    .arch setting.
michael@0: 
michael@0:    TODO: Add Thumb, Thumb2, VFP, iwMMX, etc. detection, if we need it. */
michael@0: 
michael@0: #if defined(__GNUC__) && defined(__arm__)
michael@0: 
michael@0: #  define MOZILLA_ARM_ARCH 3
michael@0: 
michael@0: #  if defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) \
michael@0:    || defined(_ARM_ARCH_4)
michael@0: #    undef MOZILLA_ARM_ARCH
michael@0: #    define MOZILLA_ARM_ARCH 4
michael@0: #  endif
michael@0: 
michael@0: #  if defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) \
michael@0:    || defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) \
michael@0:    || defined(__ARM_ARCH_5TEJ__) || defined(_ARM_ARCH_5)
michael@0: #    undef MOZILLA_ARM_ARCH
michael@0: #    define MOZILLA_ARM_ARCH 5
michael@0: #  endif
michael@0: 
michael@0: #  if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
michael@0:    || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \
michael@0:    || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) \
michael@0:    || defined(__ARM_ARCH_6M__) || defined(_ARM_ARCH_6)
michael@0: #    undef MOZILLA_ARM_ARCH
michael@0: #    define MOZILLA_ARM_ARCH 6
michael@0: #  endif
michael@0: 
michael@0: #  if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
michael@0:    || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \
michael@0:    || defined(__ARM_ARCH_7EM__) || defined(_ARM_ARCH_7)
michael@0: #    undef MOZILLA_ARM_ARCH
michael@0: #    define MOZILLA_ARM_ARCH 7
michael@0: #  endif
michael@0: 
michael@0: 
michael@0: #  ifdef __GNUC__
michael@0: #    define MOZILLA_MAY_SUPPORT_EDSP 1
michael@0: 
michael@0: #    if defined(HAVE_ARM_SIMD)
michael@0: #      define MOZILLA_MAY_SUPPORT_ARMV6 1
michael@0: #    endif
michael@0: 
michael@0: #    if defined(HAVE_ARM_NEON)
michael@0: #      define MOZILLA_MAY_SUPPORT_NEON 1
michael@0: #    endif
michael@0: 
michael@0: #    if defined(HAVE_ARM_SIMD)
michael@0: #      define MOZILLA_MAY_SUPPORT_ARMV7 1
michael@0: #    endif
michael@0: #  endif
michael@0: 
michael@0:   // When using -mfpu=neon, gcc generates neon instructions.
michael@0: 
michael@0: #  if defined(__ARM_NEON__)
michael@0: #    define MOZILLA_PRESUME_NEON 1
michael@0: #  endif
michael@0: 
michael@0:   // Currently we only have CPU detection for Linux via /proc/cpuinfo
michael@0: #  if defined(__linux__) || defined(ANDROID)
michael@0: #    define MOZILLA_ARM_HAVE_CPUID_DETECTION 1
michael@0: #  endif
michael@0: 
michael@0: #elif defined(_MSC_VER) && defined(_M_ARM)
michael@0: 
michael@0: #  define MOZILLA_ARM_HAVE_CPUID_DETECTION 1
michael@0:   // _M_ARM on MSVC has current cpu architecture.
michael@0: #  define MOZILLA_ARM_ARCH _M_ARM
michael@0: 
michael@0:   // MSVC only allows external asm for ARM, so we don't have to rely on
michael@0:   // compiler support.
michael@0: #  define MOZILLA_MAY_SUPPORT_EDSP 1
michael@0: #  if defined(HAVE_ARM_SIMD)
michael@0: #    define MOZILLA_MAY_SUPPORT_ARMV6 1
michael@0: #    define MOZILLA_MAY_SUPPORT_ARMV7 1
michael@0: #  endif
michael@0: #  if defined(HAVE_ARM_NEON)
michael@0: #    define MOZILLA_MAY_SUPPORT_NEON 1
michael@0: #  endif
michael@0: 
michael@0: #endif
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0:   namespace arm_private {
michael@0: #if defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
michael@0: #if !defined(MOZILLA_PRESUME_EDSP)
michael@0:     extern bool MFBT_DATA edsp_enabled;
michael@0: #endif
michael@0: #if !defined(MOZILLA_PRESUME_ARMV6)
michael@0:     extern bool MFBT_DATA armv6_enabled;
michael@0: #endif
michael@0: #if !defined(MOZILLA_PRESUME_ARMV7)
michael@0:     extern bool MFBT_DATA armv7_enabled;
michael@0: #endif
michael@0: #if !defined(MOZILLA_PRESUME_NEON)
michael@0:     extern bool MFBT_DATA neon_enabled;
michael@0: #endif
michael@0: #endif
michael@0:   }
michael@0: 
michael@0: #if defined(MOZILLA_PRESUME_EDSP)
michael@0: #  define MOZILLA_MAY_SUPPORT_EDSP 1
michael@0:   inline bool supports_edsp() { return true; }
michael@0: #elif defined(MOZILLA_MAY_SUPPORT_EDSP) \
michael@0:    && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
michael@0:   inline bool supports_edsp() { return arm_private::edsp_enabled; }
michael@0: #else
michael@0:   inline bool supports_edsp() { return false; }
michael@0: #endif
michael@0: 
michael@0: #if defined(MOZILLA_PRESUME_ARMV6)
michael@0: #  define MOZILLA_MAY_SUPPORT_ARMV6 1
michael@0:   inline bool supports_armv6() { return true; }
michael@0: #elif defined(MOZILLA_MAY_SUPPORT_ARMV6) \
michael@0:    && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
michael@0:   inline bool supports_armv6() { return arm_private::armv6_enabled; }
michael@0: #else
michael@0:   inline bool supports_armv6() { return false; }
michael@0: #endif
michael@0: 
michael@0: #if defined(MOZILLA_PRESUME_ARMV7)
michael@0: #  define MOZILLA_MAY_SUPPORT_ARMV7 1
michael@0:   inline bool supports_armv7() { return true; }
michael@0: #elif defined(MOZILLA_MAY_SUPPORT_ARMV7) \
michael@0:    && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
michael@0:   inline bool supports_armv7() { return arm_private::armv7_enabled; }
michael@0: #else
michael@0:   inline bool supports_armv7() { return false; }
michael@0: #endif
michael@0: 
michael@0: #if defined(MOZILLA_PRESUME_NEON)
michael@0: #  define MOZILLA_MAY_SUPPORT_NEON 1
michael@0:   inline bool supports_neon() { return true; }
michael@0: #elif defined(MOZILLA_MAY_SUPPORT_NEON) \
michael@0:    && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
michael@0:   inline bool supports_neon() { return arm_private::neon_enabled; }
michael@0: #else
michael@0:   inline bool supports_neon() { return false; }
michael@0: #endif
michael@0: 
michael@0: }
michael@0: 
michael@0: #endif /* !defined(mozilla_arm_h_) */