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| author | Dan Gohman <gohman@apple.com> | 2011-06-04 07:05:05 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2011-06-04 07:05:05 +0000 |
| commit | baf1afb2898af7a49794983d53ed301a9eb622ac (patch) | |
| tree | 7a10aad71459d301d611586755213bbfca5bbe5d /llvm/test/Transforms/GVN/phi-translate-partial-alias.ll | |
| parent | adf80ae9e458593c1b27c8674fff997c4ba0c216 (diff) | |
| download | bcm5719-llvm-baf1afb2898af7a49794983d53ed301a9eb622ac.tar.gz bcm5719-llvm-baf1afb2898af7a49794983d53ed301a9eb622ac.zip | |
Add a testcase to demonstrate the problem where phi translation is
ignored for clobbering partial-alias loads.
llvm-svn: 132633
Diffstat (limited to 'llvm/test/Transforms/GVN/phi-translate-partial-alias.ll')
| -rw-r--r-- | llvm/test/Transforms/GVN/phi-translate-partial-alias.ll | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/llvm/test/Transforms/GVN/phi-translate-partial-alias.ll b/llvm/test/Transforms/GVN/phi-translate-partial-alias.ll new file mode 100644 index 00000000000..47bec41fb16 --- /dev/null +++ b/llvm/test/Transforms/GVN/phi-translate-partial-alias.ll @@ -0,0 +1,27 @@ +; RUN: opt -basicaa -gvn -S < %s | FileCheck %s + +target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-f128:128:128-n8:16:32:64" + +; GVN shouldn't PRE the load around the loop backedge because it's +; not actually redundant around the loop backedge, despite appearances +; if phi-translation is ignored. + +; CHECK: define void @test0(i8* %begin) +; CHECK: loop: +; CHECK: %l0 = load i8* %phi +; CHECK: call void @bar(i8 %l0) +; CHECK: %l1 = load i8* %phi +define void @test0(i8* %begin) { +entry: + br label %loop + +loop: + %phi = phi i8* [ %begin, %entry ], [ %next, %loop ] + %l0 = load i8* %phi + call void @bar(i8 %l0) + %l1 = load i8* %phi + %next = getelementptr inbounds i8* %phi, i8 %l1 + br label %loop +} + +declare void @bar(i8) |
