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This patch improves the folding of vector AND nodes into blend operations for targets that feature SSE4.1. A vector AND node where one of the operands is a constant build_vector with elements that are either zero or all-ones can be converted into a blend. This allows for example to simplify the following code: define <4 x i32> @test(<4 x i32> %A, <4 x i32> %B) { %1 = and <4 x i32> %A, <i32 0, i32 0, i32 0, i32 -1> %2 = and <4 x i32> %B, <i32 -1, i32 -1, i32 -1, i32 0> %3 = or <4 x i32> %1, %2 ret <4 x i32> %3 } Before this patch llc (-mcpu=corei7) generated: andps LCPI1_0(%rip), %xmm0, %xmm0 andps LCPI1_1(%rip), %xmm1, %xmm1 orps %xmm1, %xmm0, %xmm0 retq With this patch we generate a single 'vpblendw'. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221343 91177308-0d34-0410-b5e6-96231b3b80d8 |
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