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There were cases where the backend computed a wrong permute mask for a VPERM2X128 node. Example: \code define <8 x float> @foo(<8 x float> %a, <8 x float> %b) { %shuffle = shufflevector <8 x float> %a, <8 x float> %b, <8 x i32> <i32 undef, i32 undef, i32 6, i32 7, i32 undef, i32 undef, i32 6, i32 7> ret <8 x float> %shuffle } \code end Before this patch, llc (with -mattr=+avx) emitted the following vperm2f128: vperm2f128 $0, %ymm0, %ymm0, %ymm0 # ymm0 = ymm0[0,1,0,1] With this patch, llc emits a vperm2f128 with a correct permute mask: vperm2f128 $17, %ymm0, %ymm0, %ymm0 # ymm0 = ymm0[2,3,2,3] Differential Revision: http://reviews.llvm.org/D8119 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231601 91177308-0d34-0410-b5e6-96231b3b80d8 |
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