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9aacda409d
Clang 7 changed the behavior of vec_xxpermdi in order to match GCC's
behavior. After this change, code that used to work on Clang 6 stopped
to work on Clang >= 7.
Tested on Clang 6, 7, 8 and 9.
Reference: https://bugs.llvm.org/show_bug.cgi?id=38192
Upstream fix: 361aaf77a5
87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
#ifndef CLANG_WORKAROUNDS_H
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#define CLANG_WORKAROUNDS_H
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/*
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* These stubs fix clang incompatibilities with GCC builtins.
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*/
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#ifndef __builtin_crypto_vpmsumw
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#define __builtin_crypto_vpmsumw __builtin_crypto_vpmsumb
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#endif
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#ifndef __builtin_crypto_vpmsumd
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#define __builtin_crypto_vpmsumd __builtin_crypto_vpmsumb
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#endif
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static inline
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__vector unsigned long long __attribute__((overloadable))
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vec_ld(int __a, const __vector unsigned long long* __b)
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{
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return (__vector unsigned long long)__builtin_altivec_lvx(__a, __b);
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}
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/*
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* GCC __builtin_pack_vector_int128 returns a vector __int128_t but Clang
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* does not recognize this type. On GCC this builtin is translated to a
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* xxpermdi instruction that only moves the registers __a, __b instead generates
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* a load.
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*
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* Clang has vec_xxpermdi intrinsics. It was implemented in 4.0.0.
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*/
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static inline
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__vector unsigned long long __builtin_pack_vector (unsigned long __a,
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unsigned long __b)
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{
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#if defined(__BIG_ENDIAN__)
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__vector unsigned long long __v = {__a, __b};
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#else
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__vector unsigned long long __v = {__b, __a};
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#endif
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return __v;
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}
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/*
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* Clang 7 changed the behavior of vec_xxpermdi in order to provide the same
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* behavior of GCC. That means code adapted to Clang >= 7 does not work on
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* Clang <= 6. So, fallback to __builtin_unpack_vector() on Clang <= 6.
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*/
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#if !defined vec_xxpermdi || __clang_major__ <= 6
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static inline
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unsigned long __builtin_unpack_vector (__vector unsigned long long __v,
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int __o)
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{
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return __v[__o];
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}
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#if defined(__BIG_ENDIAN__)
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#define __builtin_unpack_vector_0(a) __builtin_unpack_vector ((a), 0)
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#define __builtin_unpack_vector_1(a) __builtin_unpack_vector ((a), 1)
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#else
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#define __builtin_unpack_vector_0(a) __builtin_unpack_vector ((a), 1)
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#define __builtin_unpack_vector_1(a) __builtin_unpack_vector ((a), 0)
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#endif
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#else
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static inline
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unsigned long __builtin_unpack_vector_0 (__vector unsigned long long __v)
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{
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#if defined(__BIG_ENDIAN__)
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return vec_xxpermdi(__v, __v, 0x0)[0];
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#else
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return vec_xxpermdi(__v, __v, 0x3)[0];
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#endif
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}
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static inline
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unsigned long __builtin_unpack_vector_1 (__vector unsigned long long __v)
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{
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#if defined(__BIG_ENDIAN__)
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return vec_xxpermdi(__v, __v, 0x3)[0];
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#else
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return vec_xxpermdi(__v, __v, 0x0)[0];
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#endif
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}
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#endif /* vec_xxpermdi */
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#endif
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