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Diffstat (limited to 'test/Transforms/InstCombine/extractvalue.ll')
| -rw-r--r-- | test/Transforms/InstCombine/extractvalue.ll | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/extractvalue.ll b/test/Transforms/InstCombine/extractvalue.ll new file mode 100644 index 0000000000000..59b996e130e1c --- /dev/null +++ b/test/Transforms/InstCombine/extractvalue.ll @@ -0,0 +1,38 @@ +; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep extractvalue + +; 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 + %v3 = extractvalue {i32, {i32, i32}} %ns1, 1, 1 + call void @bar({i32, i32} %s2) + + ; Use nested extractvalues to get to a value + %s3 = extractvalue {i32, {i32, i32}} %ns1, 1 + %v4 = extractvalue {i32, i32} %s3, 1 + call void @bar({i32, i32} %s3) + + ; Use nested insertvalues to build a nested struct + %s4.1 = insertvalue {i32, i32} undef, i32 %v3, 0 + %s4 = insertvalue {i32, i32} %s4.1, i32 %v4, 1 + %ns2 = insertvalue {i32, {i32, i32}} undef, {i32, i32} %s4, 1 + + ; And now extract a single value from there + %v5 = extractvalue {i32, {i32, i32}} %ns2, 1, 1 + + ret i32 %v5 +} + |