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Before this patch, the backend sub-optimally expanded the non-constant shift count of a v8i16 shift into a sequence of two 'movd' plus 'movzwl'. With this patch the backend checks if the target features sse4.1. If so, then it lets the shuffle legalizer deal with the expansion of the shift amount. Example: ;; define <8 x i16> @test(<8 x i16> %A, <8 x i16> %B) { %shamt = shufflevector <8 x i16> %B, <8 x i16> undef, <8 x i32> zeroinitializer %shl = shl <8 x i16> %A, %shamt ret <8 x i16> %shl } ;; Before (with -mattr=+avx): vmovd %xmm1, %eax movzwl %ax, %eax vmovd %eax, %xmm1 vpsllw %xmm1, %xmm0, %xmm0 retq Now: vpxor %xmm2, %xmm2, %xmm2 vpblendw $1, %xmm1, %xmm2, %xmm1 vpsllw %xmm1, %xmm0, %xmm0 retq git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223660 91177308-0d34-0410-b5e6-96231b3b80d8 |
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