diff options
| -rw-r--r-- | extra/crc32-vpmsum/clang_workaround.h | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/extra/crc32-vpmsum/clang_workaround.h b/extra/crc32-vpmsum/clang_workaround.h index b5e7dae011c..915f7e5282f 100644 --- a/extra/crc32-vpmsum/clang_workaround.h +++ b/extra/crc32-vpmsum/clang_workaround.h @@ -39,7 +39,12 @@ __vector unsigned long long __builtin_pack_vector (unsigned long __a, return __v; } -#ifndef vec_xxpermdi +/* + * Clang 7 changed the behavior of vec_xxpermdi in order to provide the same + * behavior of GCC. That means code adapted to Clang >= 7 does not work on + * Clang <= 6. So, fallback to __builtin_unpack_vector() on Clang <= 6. + */ +#if !defined vec_xxpermdi || __clang_major__ <= 6 static inline unsigned long __builtin_unpack_vector (__vector unsigned long long __v, @@ -62,9 +67,9 @@ static inline unsigned long __builtin_unpack_vector_0 (__vector unsigned long long __v) { #if defined(__BIG_ENDIAN__) - return vec_xxpermdi(__v, __v, 0x0)[1]; - #else return vec_xxpermdi(__v, __v, 0x0)[0]; + #else + return vec_xxpermdi(__v, __v, 0x3)[0]; #endif } @@ -72,9 +77,9 @@ static inline unsigned long __builtin_unpack_vector_1 (__vector unsigned long long __v) { #if defined(__BIG_ENDIAN__) - return vec_xxpermdi(__v, __v, 0x3)[1]; - #else return vec_xxpermdi(__v, __v, 0x3)[0]; + #else + return vec_xxpermdi(__v, __v, 0x0)[0]; #endif } #endif /* vec_xxpermdi */ |