1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mozglue/build/arm.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,163 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +/* compile-time and runtime tests for whether to use SSE instructions */
1.9 +
1.10 +#ifndef mozilla_arm_h_
1.11 +#define mozilla_arm_h_
1.12 +
1.13 +// for definition of MFBT_DATA
1.14 +#include "mozilla/Types.h"
1.15 +
1.16 +/* This is patterned after SSE.h, but provides ARMv5E, ARMv6, and NEON
1.17 + detection. For reasons similar to the SSE code, code using NEON (even just
1.18 + in inline asm) needs to be in a separate compilation unit from the regular
1.19 + code, because it requires an ".fpu neon" directive which can't be undone.
1.20 + ARMv5E and ARMv6 code may also require an .arch directive, since by default
1.21 + the assembler refuses to generate code for opcodes outside of its current
1.22 + .arch setting.
1.23 +
1.24 + TODO: Add Thumb, Thumb2, VFP, iwMMX, etc. detection, if we need it. */
1.25 +
1.26 +#if defined(__GNUC__) && defined(__arm__)
1.27 +
1.28 +# define MOZILLA_ARM_ARCH 3
1.29 +
1.30 +# if defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) \
1.31 + || defined(_ARM_ARCH_4)
1.32 +# undef MOZILLA_ARM_ARCH
1.33 +# define MOZILLA_ARM_ARCH 4
1.34 +# endif
1.35 +
1.36 +# if defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) \
1.37 + || defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) \
1.38 + || defined(__ARM_ARCH_5TEJ__) || defined(_ARM_ARCH_5)
1.39 +# undef MOZILLA_ARM_ARCH
1.40 +# define MOZILLA_ARM_ARCH 5
1.41 +# endif
1.42 +
1.43 +# if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
1.44 + || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \
1.45 + || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) \
1.46 + || defined(__ARM_ARCH_6M__) || defined(_ARM_ARCH_6)
1.47 +# undef MOZILLA_ARM_ARCH
1.48 +# define MOZILLA_ARM_ARCH 6
1.49 +# endif
1.50 +
1.51 +# if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
1.52 + || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \
1.53 + || defined(__ARM_ARCH_7EM__) || defined(_ARM_ARCH_7)
1.54 +# undef MOZILLA_ARM_ARCH
1.55 +# define MOZILLA_ARM_ARCH 7
1.56 +# endif
1.57 +
1.58 +
1.59 +# ifdef __GNUC__
1.60 +# define MOZILLA_MAY_SUPPORT_EDSP 1
1.61 +
1.62 +# if defined(HAVE_ARM_SIMD)
1.63 +# define MOZILLA_MAY_SUPPORT_ARMV6 1
1.64 +# endif
1.65 +
1.66 +# if defined(HAVE_ARM_NEON)
1.67 +# define MOZILLA_MAY_SUPPORT_NEON 1
1.68 +# endif
1.69 +
1.70 +# if defined(HAVE_ARM_SIMD)
1.71 +# define MOZILLA_MAY_SUPPORT_ARMV7 1
1.72 +# endif
1.73 +# endif
1.74 +
1.75 + // When using -mfpu=neon, gcc generates neon instructions.
1.76 +
1.77 +# if defined(__ARM_NEON__)
1.78 +# define MOZILLA_PRESUME_NEON 1
1.79 +# endif
1.80 +
1.81 + // Currently we only have CPU detection for Linux via /proc/cpuinfo
1.82 +# if defined(__linux__) || defined(ANDROID)
1.83 +# define MOZILLA_ARM_HAVE_CPUID_DETECTION 1
1.84 +# endif
1.85 +
1.86 +#elif defined(_MSC_VER) && defined(_M_ARM)
1.87 +
1.88 +# define MOZILLA_ARM_HAVE_CPUID_DETECTION 1
1.89 + // _M_ARM on MSVC has current cpu architecture.
1.90 +# define MOZILLA_ARM_ARCH _M_ARM
1.91 +
1.92 + // MSVC only allows external asm for ARM, so we don't have to rely on
1.93 + // compiler support.
1.94 +# define MOZILLA_MAY_SUPPORT_EDSP 1
1.95 +# if defined(HAVE_ARM_SIMD)
1.96 +# define MOZILLA_MAY_SUPPORT_ARMV6 1
1.97 +# define MOZILLA_MAY_SUPPORT_ARMV7 1
1.98 +# endif
1.99 +# if defined(HAVE_ARM_NEON)
1.100 +# define MOZILLA_MAY_SUPPORT_NEON 1
1.101 +# endif
1.102 +
1.103 +#endif
1.104 +
1.105 +namespace mozilla {
1.106 +
1.107 + namespace arm_private {
1.108 +#if defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
1.109 +#if !defined(MOZILLA_PRESUME_EDSP)
1.110 + extern bool MFBT_DATA edsp_enabled;
1.111 +#endif
1.112 +#if !defined(MOZILLA_PRESUME_ARMV6)
1.113 + extern bool MFBT_DATA armv6_enabled;
1.114 +#endif
1.115 +#if !defined(MOZILLA_PRESUME_ARMV7)
1.116 + extern bool MFBT_DATA armv7_enabled;
1.117 +#endif
1.118 +#if !defined(MOZILLA_PRESUME_NEON)
1.119 + extern bool MFBT_DATA neon_enabled;
1.120 +#endif
1.121 +#endif
1.122 + }
1.123 +
1.124 +#if defined(MOZILLA_PRESUME_EDSP)
1.125 +# define MOZILLA_MAY_SUPPORT_EDSP 1
1.126 + inline bool supports_edsp() { return true; }
1.127 +#elif defined(MOZILLA_MAY_SUPPORT_EDSP) \
1.128 + && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
1.129 + inline bool supports_edsp() { return arm_private::edsp_enabled; }
1.130 +#else
1.131 + inline bool supports_edsp() { return false; }
1.132 +#endif
1.133 +
1.134 +#if defined(MOZILLA_PRESUME_ARMV6)
1.135 +# define MOZILLA_MAY_SUPPORT_ARMV6 1
1.136 + inline bool supports_armv6() { return true; }
1.137 +#elif defined(MOZILLA_MAY_SUPPORT_ARMV6) \
1.138 + && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
1.139 + inline bool supports_armv6() { return arm_private::armv6_enabled; }
1.140 +#else
1.141 + inline bool supports_armv6() { return false; }
1.142 +#endif
1.143 +
1.144 +#if defined(MOZILLA_PRESUME_ARMV7)
1.145 +# define MOZILLA_MAY_SUPPORT_ARMV7 1
1.146 + inline bool supports_armv7() { return true; }
1.147 +#elif defined(MOZILLA_MAY_SUPPORT_ARMV7) \
1.148 + && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
1.149 + inline bool supports_armv7() { return arm_private::armv7_enabled; }
1.150 +#else
1.151 + inline bool supports_armv7() { return false; }
1.152 +#endif
1.153 +
1.154 +#if defined(MOZILLA_PRESUME_NEON)
1.155 +# define MOZILLA_MAY_SUPPORT_NEON 1
1.156 + inline bool supports_neon() { return true; }
1.157 +#elif defined(MOZILLA_MAY_SUPPORT_NEON) \
1.158 + && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
1.159 + inline bool supports_neon() { return arm_private::neon_enabled; }
1.160 +#else
1.161 + inline bool supports_neon() { return false; }
1.162 +#endif
1.163 +
1.164 +}
1.165 +
1.166 +#endif /* !defined(mozilla_arm_h_) */
