[PATCH] D79886: [DAGCombiner] try to move splat after binop with splat constant
Craig Topper via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed May 13 19:07:24 PDT 2020
craig.topper added inline comments.
================
Comment at: llvm/test/CodeGen/X86/vector-rotate-128.ll:854
; SSE2: # %bb.0:
-; SSE2-NEXT: pshuflw {{.*#+}} xmm1 = xmm1[0,0,2,3,4,5,6,7]
-; SSE2-NEXT: pshufd {{.*#+}} xmm1 = xmm1[0,0,0,0]
+; SSE2-NEXT: movl $65535, %eax # imm = 0xFFFF
+; SSE2-NEXT: movd %eax, %xmm2
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Something weird happened here I think. We appear to be loading a constant as an immediate and moving it into a vector. Then we AND it with something that was just ANDed with a constant pool. Could the two ANDs using a single constant pool?
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D79886/new/
https://reviews.llvm.org/D79886
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