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| author | Matthijs Kooijman <matthijs@stdin.nl> | 2008-06-11 14:05:05 +0000 |
|---|---|---|
| committer | Matthijs Kooijman <matthijs@stdin.nl> | 2008-06-11 14:05:05 +0000 |
| commit | da9ef70dc7957f52e2852b8921591da40851d4cc (patch) | |
| tree | bd49c0bcfbbcd1be64b6b7da5b93fcbd9255c78d /test | |
| parent | b259b6ca02ec2ac178c0813a9355af7aff57f061 (diff) | |
| download | external_llvm-da9ef70dc7957f52e2852b8921591da40851d4cc.zip external_llvm-da9ef70dc7957f52e2852b8921591da40851d4cc.tar.gz external_llvm-da9ef70dc7957f52e2852b8921591da40851d4cc.tar.bz2 | |
Teach instruction combining about the extractvalue. It can succesfully fold
useless insert-extract chains, similar to how it folds them for vectors.
Add a testcase for this.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52217 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/InstCombine/extractvalue.ll | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/extractvalue.ll b/test/Transforms/InstCombine/extractvalue.ll new file mode 100644 index 0000000..8abeb7d --- /dev/null +++ b/test/Transforms/InstCombine/extractvalue.ll @@ -0,0 +1,24 @@ +; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep extractelement + +; Instcombine should fold various combinations of insertvalue and extractvalue +; together +declare void @bar({i32, i32} %a) + +define i32 @foo() { + ; Build a simple struct and pull values out again + %s1.1 = insertvalue {i32, i32} undef, i32 0, 0 + %s1 = insertvalue {i32, i32} %s1.1, i32 1, 1 + %v1 = extractvalue {i32, i32} %s1, 0 + %v2 = extractvalue {i32, i32} %s1, 1 + + ; Build a nested struct and pull a sub struct out of it + ; This requires instcombine to insert a few insertvalue instructions + %ns1.1 = insertvalue {i32, {i32, i32}} undef, i32 %v1, 0 + %ns1.2 = insertvalue {i32, {i32, i32}} %ns1.1, i32 %v1, 1, 0 + %ns1 = insertvalue {i32, {i32, i32}} %ns1.2, i32 %v2, 1, 1 + %s2 = extractvalue {i32, {i32, i32}} %ns1, 1 + call void @bar({i32, i32} %s2) + %v3 = extractvalue {i32, {i32, i32}} %ns1, 1, 1 + ret i32 %v3 +} + |