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| author | Eli Friedman <eli.friedman@gmail.com> | 2011-12-26 22:49:32 +0000 |
|---|---|---|
| committer | Eli Friedman <eli.friedman@gmail.com> | 2011-12-26 22:49:32 +0000 |
| commit | d6e2560e7aea0e6c6bca950966252552f1caec63 (patch) | |
| tree | ec87c137c9ee4417b7e3b351fe466d2bc4d20f5a /test/CodeGen/X86/2011-12-26-extractelement-duplicate-load.ll | |
| parent | c9a1aed7fefe627820bb92154361ede0568229fc (diff) | |
| download | external_llvm-d6e2560e7aea0e6c6bca950966252552f1caec63.zip external_llvm-d6e2560e7aea0e6c6bca950966252552f1caec63.tar.gz external_llvm-d6e2560e7aea0e6c6bca950966252552f1caec63.tar.bz2 | |
Make sure DAGCombiner doesn't introduce multiple loads from the same memory location. PR10747, part 2.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147283 91177308-0d34-0410-b5e6-96231b3b80d8
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 +} |