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Diffstat (limited to 'mozglue/build/arm.h')
| -rw-r--r-- | mozglue/build/arm.h | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/mozglue/build/arm.h b/mozglue/build/arm.h new file mode 100644 index 0000000000..8600329931 --- /dev/null +++ b/mozglue/build/arm.h @@ -0,0 +1,145 @@ +/* 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_arm_h_ +#define mozilla_arm_h_ + +// for definition of MFBT_DATA +#include "mozilla/Types.h" + +/* This is patterned after SSE.h, but provides ARMv5E, ARMv6, and NEON + detection. For reasons similar to the SSE code, code using NEON (even just + in inline asm) needs to be in a separate compilation unit from the regular + code, because it requires an ".fpu neon" directive which can't be undone. + ARMv5E and ARMv6 code may also require an .arch directive, since by default + the assembler refuses to generate code for opcodes outside of its current + .arch setting. + + TODO: Add Thumb, Thumb2, VFP, iwMMX, etc. detection, if we need it. */ + +#if defined(__GNUC__) && defined(__arm__) + +# define MOZILLA_ARM_ARCH 3 + +# if defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) || \ + defined(_ARM_ARCH_4) +# undef MOZILLA_ARM_ARCH +# define MOZILLA_ARM_ARCH 4 +# endif + +# if defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) || \ + defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) || \ + defined(__ARM_ARCH_5TEJ__) || defined(_ARM_ARCH_5) +# undef MOZILLA_ARM_ARCH +# define MOZILLA_ARM_ARCH 5 +# endif + +# if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || \ + defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) || \ + defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) || \ + defined(__ARM_ARCH_6M__) || defined(_ARM_ARCH_6) +# undef MOZILLA_ARM_ARCH +# define MOZILLA_ARM_ARCH 6 +# endif + +# if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || \ + defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || \ + defined(__ARM_ARCH_7EM__) || defined(_ARM_ARCH_7) +# undef MOZILLA_ARM_ARCH +# define MOZILLA_ARM_ARCH 7 +# endif + +# ifdef __GNUC__ +# define MOZILLA_MAY_SUPPORT_EDSP 1 + +# if defined(HAVE_ARM_SIMD) +# define MOZILLA_MAY_SUPPORT_ARMV6 1 +# endif + +# if defined(HAVE_ARM_NEON) +# define MOZILLA_MAY_SUPPORT_NEON 1 +# endif + +# if defined(HAVE_ARM_SIMD) +# define MOZILLA_MAY_SUPPORT_ARMV7 1 +# endif +# endif + +// Currently we only have CPU detection for Linux via /proc/cpuinfo +# if defined(__linux__) || defined(ANDROID) +# define MOZILLA_ARM_HAVE_CPUID_DETECTION 1 +# endif + +#endif + +// When using -mfpu=neon on arm gcc, or using default on aarch64, +// the compiler generates neon instructions. +#if defined(__ARM_NEON) +# define MOZILLA_PRESUME_NEON 1 +#endif + +namespace mozilla { + +namespace arm_private { +#if defined(MOZILLA_ARM_HAVE_CPUID_DETECTION) +# if !defined(MOZILLA_PRESUME_EDSP) +extern bool MFBT_DATA edsp_enabled; +# endif +# if !defined(MOZILLA_PRESUME_ARMV6) +extern bool MFBT_DATA armv6_enabled; +# endif +# if !defined(MOZILLA_PRESUME_ARMV7) +extern bool MFBT_DATA armv7_enabled; +# endif +# if !defined(MOZILLA_PRESUME_NEON) +extern bool MFBT_DATA neon_enabled; +# endif +#endif +} // namespace arm_private + +#if defined(MOZILLA_PRESUME_EDSP) +# define MOZILLA_MAY_SUPPORT_EDSP 1 +inline bool supports_edsp() { return true; } +#elif defined(MOZILLA_MAY_SUPPORT_EDSP) && \ + defined(MOZILLA_ARM_HAVE_CPUID_DETECTION) +inline bool supports_edsp() { return arm_private::edsp_enabled; } +#else +inline bool supports_edsp() { return false; } +#endif + +#if defined(MOZILLA_PRESUME_ARMV6) +# define MOZILLA_MAY_SUPPORT_ARMV6 1 +inline bool supports_armv6() { return true; } +#elif defined(MOZILLA_MAY_SUPPORT_ARMV6) && \ + defined(MOZILLA_ARM_HAVE_CPUID_DETECTION) +inline bool supports_armv6() { return arm_private::armv6_enabled; } +#else +inline bool supports_armv6() { return false; } +#endif + +#if defined(MOZILLA_PRESUME_ARMV7) +# define MOZILLA_MAY_SUPPORT_ARMV7 1 +inline bool supports_armv7() { return true; } +#elif defined(MOZILLA_MAY_SUPPORT_ARMV7) && \ + defined(MOZILLA_ARM_HAVE_CPUID_DETECTION) +inline bool supports_armv7() { return arm_private::armv7_enabled; } +#else +inline bool supports_armv7() { return false; } +#endif + +#if defined(MOZILLA_PRESUME_NEON) +# define MOZILLA_MAY_SUPPORT_NEON 1 +inline bool supports_neon() { return true; } +#elif defined(MOZILLA_MAY_SUPPORT_NEON) && \ + defined(MOZILLA_ARM_HAVE_CPUID_DETECTION) +inline bool supports_neon() { return arm_private::neon_enabled; } +#else +inline bool supports_neon() { return false; } +#endif + +} // namespace mozilla + +#endif /* !defined(mozilla_arm_h_) */ |