RKSimon added a comment.
It seems like part of the need for this is because the _mm_cmp_ps style
intrinsics are defined as macros (to get around the problem of trying to use an
immediate as an argument):
#define _mm_cmp_ps(a, b, c) __extension__ ({ \
(__m128)__builtin_ia32_cmpps((__v4sf)(__m128)(a), \
(__v4sf)(__m128)(b), (c)); })
which means clang can't use a __target__("avx") attribute to stop their use.
Given that I'm happy with this patch's approach - anyone else have any
suggestions?
http://reviews.llvm.org/D21306
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