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Summary:
This is similar to vec_ct* in https://reviews.llvm.org/rL304205.
The argument must be a constant, otherwise instruction selection
will fail. always_inline is not enough for isel to always fold
everything away at -O0.
The fix is to turn the function into macros in altivec.h.
Fixes https://bugs.llvm.org/show_bug.cgi?id=43072
Reviewers: nemanjai, hfinkel, #powerpc, wuzish
Reviewed By: #powerpc, wuzish
Subscribers: wuzish, kbarton, MaskRay, shchenz, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D66699
llvm-svn: 370902
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