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Diffstat (limited to 'test/CodeGen/X86/2011-12-26-extractelement-duplicate-load.ll')
| -rw-r--r-- | test/CodeGen/X86/2011-12-26-extractelement-duplicate-load.ll | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2011-12-26-extractelement-duplicate-load.ll b/test/CodeGen/X86/2011-12-26-extractelement-duplicate-load.ll new file mode 100644 index 0000000..39c213f --- /dev/null +++ b/test/CodeGen/X86/2011-12-26-extractelement-duplicate-load.ll @@ -0,0 +1,16 @@ +; RUN: llc -march=x86-64 -mattr=-sse42,+sse41 < %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 + +; CHECK: test: +; CHECK: pextrd $2, %xmm +define <4 x i32> @test(<4 x i32>* %p) { + %v = load <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 +} |