forked from OSchip/llvm-project
39 lines
1.5 KiB
LLVM
39 lines
1.5 KiB
LLVM
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep extractvalue
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; Instcombine should fold various combinations of insertvalue and extractvalue
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; together
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declare void @bar({i32, i32} %a)
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define i32 @foo() {
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; Build a simple struct and pull values out again
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%s1.1 = insertvalue {i32, i32} undef, i32 0, 0
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%s1 = insertvalue {i32, i32} %s1.1, i32 1, 1
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%v1 = extractvalue {i32, i32} %s1, 0
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%v2 = extractvalue {i32, i32} %s1, 1
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; Build a nested struct and pull a sub struct out of it
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; This requires instcombine to insert a few insertvalue instructions
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%ns1.1 = insertvalue {i32, {i32, i32}} undef, i32 %v1, 0
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%ns1.2 = insertvalue {i32, {i32, i32}} %ns1.1, i32 %v1, 1, 0
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%ns1 = insertvalue {i32, {i32, i32}} %ns1.2, i32 %v2, 1, 1
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%s2 = extractvalue {i32, {i32, i32}} %ns1, 1
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%v3 = extractvalue {i32, {i32, i32}} %ns1, 1, 1
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call void @bar({i32, i32} %s2)
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; Use nested extractvalues to get to a value
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%s3 = extractvalue {i32, {i32, i32}} %ns1, 1
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%v4 = extractvalue {i32, i32} %s3, 1
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call void @bar({i32, i32} %s3)
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; Use nested insertvalues to build a nested struct
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%s4.1 = insertvalue {i32, i32} undef, i32 %v3, 0
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%s4 = insertvalue {i32, i32} %s4.1, i32 %v4, 1
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%ns2 = insertvalue {i32, {i32, i32}} undef, {i32, i32} %s4, 1
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; And now extract a single value from there
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%v5 = extractvalue {i32, {i32, i32}} %ns2, 1, 1
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ret i32 %v5
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}
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