diff options
Diffstat (limited to 'absl/base/config.h')
| -rw-r--r-- | absl/base/config.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/absl/base/config.h b/absl/base/config.h index a0d599fe..5985358f 100644 --- a/absl/base/config.h +++ b/absl/base/config.h @@ -882,4 +882,19 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' || #define ABSL_INTERNAL_HAVE_SSSE3 1 #endif +// ABSL_INTERNAL_HAVE_ARM_ACLE is used for compile-time detection of ACLE (ARM +// C language extensions). +#ifdef ABSL_INTERNAL_HAVE_ARM_ACLE +#error ABSL_INTERNAL_HAVE_ARM_ACLE cannot be directly set +// __cls, __rbit were added quite late in clang. They are not supported +// by GCC as well. __cls can be replaced with __builtin_clrsb but clang does +// not recognize cls instruction in latest versions. +// TODO(b/233604649): Relax to __builtin_clrsb and __builtin_bitreverse64 (note +// that the latter is not supported by GCC). +#elif defined(__ARM_ACLE) && defined(__clang__) && \ + ABSL_HAVE_BUILTIN(__builtin_arm_cls64) && \ + ABSL_HAVE_BUILTIN(__builtin_arm_rbit64) +#define ABSL_INTERNAL_HAVE_ARM_ACLE 1 +#endif + #endif // ABSL_BASE_CONFIG_H_ |