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108 lines
3.7 KiB
LLVM
108 lines
3.7 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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declare void @bar({i32, i32} %a)
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declare i32 @baz(i32 %a)
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; CHECK: define i32 @foo
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; CHECK-NOT: extractvalue
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define i32 @foo(i32 %a, i32 %b) {
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; Instcombine should fold various combinations of insertvalue and extractvalue
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; together
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; Build a simple struct and pull values out again
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%s1.1 = insertvalue {i32, i32} undef, i32 %a, 0
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%s1 = insertvalue {i32, i32} %s1.1, i32 %b, 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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; CHECK: define i32 @extract2gep
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; CHECK-NEXT: [[GEP:%[a-z0-9]+]] = getelementptr inbounds {{.*}}* %pair, i32 0, i32 1
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; CHECK-NEXT: [[LOAD:%[A-Za-z0-9]+]] = load i32* [[GEP]]
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; CHECK-NEXT: store
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; CHECK-NEXT: br label %loop
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; CHECK-NOT: extractvalue
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; CHECK: call {{.*}}(i32 [[LOAD]])
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; CHECK-NOT: extractvalue
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; CHECK: ret i32 [[LOAD]]
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define i32 @extract2gep({i32, i32}* %pair, i32* %P) {
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; The load + extractvalue should be converted
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; to an inbounds gep + smaller load.
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; The new load should be in the same spot as the old load.
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%L = load {i32, i32}* %pair
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store i32 0, i32* %P
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br label %loop
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loop:
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%E = extractvalue {i32, i32} %L, 1
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%C = call i32 @baz(i32 %E)
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store i32 %C, i32* %P
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%cond = icmp eq i32 %C, 0
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br i1 %cond, label %end, label %loop
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end:
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ret i32 %E
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}
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; CHECK: define i32 @doubleextract2gep
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; CHECK-NEXT: [[GEP:%[a-z0-9]+]] = getelementptr inbounds {{.*}}* %arg, i32 0, i32 1, i32 1
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; CHECK-NEXT: [[LOAD:%[A-Za-z0-9]+]] = load i32* [[GEP]]
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; CHECK-NEXT: ret i32 [[LOAD]]
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define i32 @doubleextract2gep({i32, {i32, i32}}* %arg) {
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; The load + extractvalues should be converted
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; to a 3-index inbounds gep + smaller load.
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%L = load {i32, {i32, i32}}* %arg
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%E1 = extractvalue {i32, {i32, i32}} %L, 1
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%E2 = extractvalue {i32, i32} %E1, 1
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ret i32 %E2
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}
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; CHECK: define i32 @nogep-multiuse
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; CHECK-NEXT: load {{.*}} %pair
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; CHECK-NEXT: extractvalue
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; CHECK-NEXT: extractvalue
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; CHECK-NEXT: add
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; CHECK-NEXT: ret
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define i32 @nogep-multiuse({i32, i32}* %pair) {
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; The load should be left unchanged since both parts are needed.
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%L = volatile load {i32, i32}* %pair
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%LHS = extractvalue {i32, i32} %L, 0
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%RHS = extractvalue {i32, i32} %L, 1
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%R = add i32 %LHS, %RHS
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ret i32 %R
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}
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; CHECK: define i32 @nogep-volatile
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; CHECK-NEXT: volatile load {{.*}} %pair
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; CHECK-NEXT: extractvalue
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; CHECK-NEXT: ret
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define i32 @nogep-volatile({i32, i32}* %pair) {
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; The volatile load should be left unchanged.
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%L = volatile load {i32, i32}* %pair
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%E = extractvalue {i32, i32} %L, 1
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ret i32 %E
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}
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