forked from OSchip/llvm-project
62 lines
3.5 KiB
LLVM
62 lines
3.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=dse -S | FileCheck %s
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target datalayout = "E-m:e-p:32:32-i64:32-f64:32:64-a:0:32-n32-S32"
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%struct.ilist = type { i32, %struct.ilist* }
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; There is no dead store in this test. Make sure no store is deleted by DSE.
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; Test case related to bug report PR52774.
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define %struct.ilist* @test() {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[TMP0:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[LIST_NEXT:%.*]] = phi %struct.ilist* [ null, [[TMP0]] ], [ [[LIST_NEW_ILIST_PTR:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[LIST_NEW_I8_PTR:%.*]] = tail call align 8 dereferenceable_or_null(8) i8* @malloc(i32 8)
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; CHECK-NEXT: [[LIST_NEW_ILIST_PTR]] = bitcast i8* [[LIST_NEW_I8_PTR]] to %struct.ilist*
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; CHECK-NEXT: [[GEP_NEW_VALUE:%.*]] = getelementptr inbounds [[STRUCT_ILIST:%.*]], %struct.ilist* [[LIST_NEW_ILIST_PTR]], i32 0, i32 0
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; CHECK-NEXT: store i32 42, i32* [[GEP_NEW_VALUE]], align 8
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; CHECK-NEXT: [[GEP_NEW_NEXT:%.*]] = getelementptr inbounds [[STRUCT_ILIST]], %struct.ilist* [[LIST_NEW_ILIST_PTR]], i32 0, i32 1
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; CHECK-NEXT: store %struct.ilist* [[LIST_NEXT]], %struct.ilist** [[GEP_NEW_NEXT]], align 4
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; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
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; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[IV_NEXT]], 10
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; CHECK-NEXT: br i1 [[COND]], label [[EXIT:%.*]], label [[LOOP]]
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; CHECK: exit:
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; CHECK-NEXT: [[LIST_LAST_ILIST_PTR:%.*]] = bitcast i8* [[LIST_NEW_I8_PTR]] to %struct.ilist*
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; CHECK-NEXT: [[GEP_LIST_LAST_NEXT:%.*]] = getelementptr inbounds [[STRUCT_ILIST]], %struct.ilist* [[LIST_LAST_ILIST_PTR]], i32 0, i32 1
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; CHECK-NEXT: store %struct.ilist* null, %struct.ilist** [[GEP_LIST_LAST_NEXT]], align 4
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; CHECK-NEXT: [[GEP_LIST_NEXT_NEXT:%.*]] = getelementptr inbounds [[STRUCT_ILIST]], %struct.ilist* [[LIST_NEXT]], i32 0, i32 1
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; CHECK-NEXT: [[LOADED_PTR:%.*]] = load %struct.ilist*, %struct.ilist** [[GEP_LIST_NEXT_NEXT]], align 4
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; CHECK-NEXT: ret %struct.ilist* [[LOADED_PTR]]
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;
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br label %loop
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loop:
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%iv = phi i32 [ 0, %0 ], [ %iv.next, %loop ]
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%list.next = phi %struct.ilist* [ null, %0 ], [ %list.new.ilist.ptr, %loop ]
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%list.new.i8.ptr = tail call align 8 dereferenceable_or_null(8) i8* @malloc(i32 8)
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%list.new.ilist.ptr = bitcast i8* %list.new.i8.ptr to %struct.ilist*
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%gep.new.value = getelementptr inbounds %struct.ilist, %struct.ilist* %list.new.ilist.ptr, i32 0, i32 0
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store i32 42, i32* %gep.new.value, align 8
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%gep.new.next = getelementptr inbounds %struct.ilist, %struct.ilist* %list.new.ilist.ptr, i32 0, i32 1
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store %struct.ilist* %list.next, %struct.ilist** %gep.new.next, align 4
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%iv.next = add nuw nsw i32 %iv, 1
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%cond = icmp eq i32 %iv.next, 10
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br i1 %cond, label %exit, label %loop
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exit:
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%list.last.ilist.ptr = bitcast i8* %list.new.i8.ptr to %struct.ilist*
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%gep.list.last.next = getelementptr inbounds %struct.ilist, %struct.ilist* %list.last.ilist.ptr, i32 0, i32 1
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store %struct.ilist* null, %struct.ilist** %gep.list.last.next, align 4
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%gep.list.next.next = getelementptr inbounds %struct.ilist, %struct.ilist* %list.next, i32 0, i32 1
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%loaded_ptr = load %struct.ilist*, %struct.ilist** %gep.list.next.next, align 4
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ret %struct.ilist* %loaded_ptr ; use loaded pointer
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}
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; Function Attrs: inaccessiblememonly nounwind
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declare noalias noundef align 8 i8* @malloc(i32 noundef) local_unnamed_addr #0
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attributes #0 = { inaccessiblememonly nounwind}
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