Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/CodeGen/X86/2011-12-26-extractelement-duplicate-load.ll

@@ -0,0 +1,26 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=x86_64-unknown -mattr=-sse4.2,+sse4.1 < %s | FileCheck %s
+
+; Make sure we don't load from the location pointed to by %p
+; twice: it has non-obvious performance implications, and
+; the relevant transformation doesn't know how to update
+; the chains correctly.
+; PR10747
+
+define <4 x i32> @test(<4 x i32>* %p) {
+; CHECK-LABEL: test:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    movaps (%rdi), %xmm0
+; CHECK-NEXT:    extractps $2, %xmm0, %eax
+; CHECK-NEXT:    cmpl $3, %eax
+; CHECK-NEXT:    je .LBB0_2
+; CHECK-NEXT:  # %bb.1:
+; CHECK-NEXT:    xorps %xmm0, %xmm0
+; CHECK-NEXT:  .LBB0_2:
+; CHECK-NEXT:    retq
+  %v = load <4 x i32>, <4 x i32>* %p
+  %e = extractelement <4 x i32> %v, i32 2
+  %cmp = icmp eq i32 %e, 3
+  %sel = select i1 %cmp, <4 x i32> %v, <4 x i32> zeroinitializer
+  ret <4 x i32> %sel
+}