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This patch fixes the sse2/avx2 vector shift by constant instcombine call to correctly deal with the fact that the shift amount is formed from the entire lower 64-bit and not just the lowest element as it currently assumes. e.g. %1 = tail call <4 x i32> @llvm.x86.sse2.psrl.d(<4 x i32> %v, <4 x i32> <i32 15, i32 15, i32 15, i32 15>) In this case, (V)PSRLD doesn't perform a lshr by 15 but in fact attempts to shift by 64424509455 ((15 << 32) | 15) - giving a zero result. In addition, this review also recognizes shift-by-zero from a ConstantAggregateZero type (PR23821). Differential Revision: http://reviews.llvm.org/D11760 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244341 91177308-0d34-0410-b5e6-96231b3b80d8
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