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+/* 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
+
+#if defined(__ARM_FEATURE_CRYPTO)
+# define MOZILLA_PRESUME_ARM_AES 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
+# if !defined(MOZILLA_PRESUME_ARM_AES)
+extern bool MFBT_DATA aes_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
+#if defined(MOZILLA_PRESUME_ARM_AES)
+inline bool supports_arm_aes() { return true; }
+#elif defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
+inline bool supports_arm_aes() { return arm_private::aes_enabled; }
+#else
+inline bool supports_arm_aes() { return false; }
+#endif
+
+} // namespace mozilla
+
+#endif /* !defined(mozilla_arm_h_) */