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condition to match a blend. This prevents optimizations that work on VSELECT to perform invalid transformations. Indeed, the optimized condition does not match the vector boolean content that is expected and bad things may happen. This patch yields the exact same code on the whole test-suite + specs (-O3 and -O3 -march=core-avx2), it improves one test case (vector-blend.ll) and fixes a bug reduced in vselect-avx.ll. <rdar://problem/18819506> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221429 91177308-0d34-0410-b5e6-96231b3b80d8
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