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b29b50a9dd
For non padded structs, we can just proceed and deaggregate them. We don't want ot do this when there is padding in the struct as to not lose information about this padding (the subsequents passes would then try hard to preserve the padding, which is undesirable). Also update extractvalue.ll and cast.ll so that they use structs with padding. Remove the FIXME in the extractvalue of laod case as the non padded case is handled when processing the load, and we don't want to do it on the padded case. Patch by: Amaury SECHET <deadalnix@gmail.com> Differential Revision: http://reviews.llvm.org/D14483 From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 255600
108 lines
3.8 KiB
LLVM
108 lines
3.8 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-LABEL: 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-LABEL: define i32 @extract2gep(
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; CHECK-NEXT: [[GEP:%[a-z0-9]+]] = getelementptr inbounds {{.*}}, {{.*}}* %pair, i64 0, i32 1
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; CHECK-NEXT: [[LOAD:%[A-Za-z0-9]+]] = load i32, 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({i16, 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 {i16, i32}, {i16, 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 {i16, 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-LABEL: define i16 @doubleextract2gep(
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; CHECK-NEXT: [[GEP:%[a-z0-9]+]] = getelementptr inbounds {{.*}}, {{.*}}* %arg, i64 0, i32 1, i32 1
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; CHECK-NEXT: [[LOAD:%[A-Za-z0-9]+]] = load i16, i16* [[GEP]]
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; CHECK-NEXT: ret i16 [[LOAD]]
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define i16 @doubleextract2gep({i16, {i32, i16}}* %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 {i16, {i32, i16}}, {i16, {i32, i16}}* %arg
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%E1 = extractvalue {i16, {i32, i16}} %L, 1
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%E2 = extractvalue {i32, i16} %E1, 1
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ret i16 %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 = load volatile {i32, i32}, {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: load volatile {{.*}} %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 load volatile should be left unchanged.
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%L = load volatile {i32, i32}, {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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