[PATCH] D79718: [x86][CGP] enable target hook to sink funnel shift intrinsic's splatted shift amount

[Craig Topper via Phabricator via llvm-commits]

craig.topper added inline comments.


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Comment at: llvm/test/CodeGen/X86/vector-fshl-128.ll:2195
 ; AVX1-NEXT:    movq $-1024, %rax # imm = 0xFC00
-; AVX1-NEXT:    vpand {{.*}}(%rip), %xmm0, %xmm0
-; AVX1-NEXT:    vpslld $23, %xmm0, %xmm0
-; AVX1-NEXT:    vpaddd {{.*}}(%rip), %xmm0, %xmm0
-; AVX1-NEXT:    vcvttps2dq %xmm0, %xmm0
-; AVX1-NEXT:    vpshufd {{.*#+}} xmm1 = xmm0[1,1,3,3]
+; AVX1-NEXT:    vpshufd {{.*#+}} xmm0 = xmm0[0,0,0,0]
+; AVX1-NEXT:    vpand {{.*}}(%rip), %xmm0, %xmm1
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Why are we splatting the scalar here when only element 0 is used?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D79718/new/

https://reviews.llvm.org/D79718