90d1786ba0
Fix handling of alloc-like instructions in isGuaranteedLoopInvariant(). It was not valid when the 'KillingDef' was outside of the loop, while the 'CurrentDef' was inside the loop. In that case, the 'KillingDef' only overwrites the definition from the last iteration of the loop, and not the ones of all iterations. Therefor it does not make the 'CurrentDef' to be dead, and must not remove it. Fixing issue : https://github.com/llvm/llvm-project/issues/52774 Reviewed by: Florian Hahn Differential revision: https://reviews.llvm.org/D115965
62 lines
3.5 KiB
LLVM
62 lines
3.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt < %s -passes=dse -S | FileCheck %s
|
|
|
|
target datalayout = "E-m:e-p:32:32-i64:32-f64:32:64-a:0:32-n32-S32"
|
|
|
|
%struct.ilist = type { i32, %struct.ilist* }
|
|
|
|
; There is no dead store in this test. Make sure no store is deleted by DSE.
|
|
; Test case related to bug report PR52774.
|
|
|
|
define %struct.ilist* @test() {
|
|
; CHECK-LABEL: @test(
|
|
; CHECK-NEXT: br label [[LOOP:%.*]]
|
|
; CHECK: loop:
|
|
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[TMP0:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
|
|
; CHECK-NEXT: [[LIST_NEXT:%.*]] = phi %struct.ilist* [ null, [[TMP0]] ], [ [[LIST_NEW_ILIST_PTR:%.*]], [[LOOP]] ]
|
|
; CHECK-NEXT: [[LIST_NEW_I8_PTR:%.*]] = tail call align 8 dereferenceable_or_null(8) i8* @malloc(i32 8)
|
|
; CHECK-NEXT: [[LIST_NEW_ILIST_PTR]] = bitcast i8* [[LIST_NEW_I8_PTR]] to %struct.ilist*
|
|
; CHECK-NEXT: [[GEP_NEW_VALUE:%.*]] = getelementptr inbounds [[STRUCT_ILIST:%.*]], %struct.ilist* [[LIST_NEW_ILIST_PTR]], i32 0, i32 0
|
|
; CHECK-NEXT: store i32 42, i32* [[GEP_NEW_VALUE]], align 8
|
|
; CHECK-NEXT: [[GEP_NEW_NEXT:%.*]] = getelementptr inbounds [[STRUCT_ILIST]], %struct.ilist* [[LIST_NEW_ILIST_PTR]], i32 0, i32 1
|
|
; CHECK-NEXT: store %struct.ilist* [[LIST_NEXT]], %struct.ilist** [[GEP_NEW_NEXT]], align 4
|
|
; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
|
|
; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[IV_NEXT]], 10
|
|
; CHECK-NEXT: br i1 [[COND]], label [[EXIT:%.*]], label [[LOOP]]
|
|
; CHECK: exit:
|
|
; CHECK-NEXT: [[LIST_LAST_ILIST_PTR:%.*]] = bitcast i8* [[LIST_NEW_I8_PTR]] to %struct.ilist*
|
|
; CHECK-NEXT: [[GEP_LIST_LAST_NEXT:%.*]] = getelementptr inbounds [[STRUCT_ILIST]], %struct.ilist* [[LIST_LAST_ILIST_PTR]], i32 0, i32 1
|
|
; CHECK-NEXT: store %struct.ilist* null, %struct.ilist** [[GEP_LIST_LAST_NEXT]], align 4
|
|
; CHECK-NEXT: [[GEP_LIST_NEXT_NEXT:%.*]] = getelementptr inbounds [[STRUCT_ILIST]], %struct.ilist* [[LIST_NEXT]], i32 0, i32 1
|
|
; CHECK-NEXT: [[LOADED_PTR:%.*]] = load %struct.ilist*, %struct.ilist** [[GEP_LIST_NEXT_NEXT]], align 4
|
|
; CHECK-NEXT: ret %struct.ilist* [[LOADED_PTR]]
|
|
;
|
|
br label %loop
|
|
|
|
loop:
|
|
%iv = phi i32 [ 0, %0 ], [ %iv.next, %loop ]
|
|
%list.next = phi %struct.ilist* [ null, %0 ], [ %list.new.ilist.ptr, %loop ]
|
|
%list.new.i8.ptr = tail call align 8 dereferenceable_or_null(8) i8* @malloc(i32 8)
|
|
%list.new.ilist.ptr = bitcast i8* %list.new.i8.ptr to %struct.ilist*
|
|
%gep.new.value = getelementptr inbounds %struct.ilist, %struct.ilist* %list.new.ilist.ptr, i32 0, i32 0
|
|
store i32 42, i32* %gep.new.value, align 8
|
|
%gep.new.next = getelementptr inbounds %struct.ilist, %struct.ilist* %list.new.ilist.ptr, i32 0, i32 1
|
|
store %struct.ilist* %list.next, %struct.ilist** %gep.new.next, align 4
|
|
%iv.next = add nuw nsw i32 %iv, 1
|
|
%cond = icmp eq i32 %iv.next, 10
|
|
br i1 %cond, label %exit, label %loop
|
|
|
|
exit:
|
|
%list.last.ilist.ptr = bitcast i8* %list.new.i8.ptr to %struct.ilist*
|
|
%gep.list.last.next = getelementptr inbounds %struct.ilist, %struct.ilist* %list.last.ilist.ptr, i32 0, i32 1
|
|
store %struct.ilist* null, %struct.ilist** %gep.list.last.next, align 4
|
|
%gep.list.next.next = getelementptr inbounds %struct.ilist, %struct.ilist* %list.next, i32 0, i32 1
|
|
%loaded_ptr = load %struct.ilist*, %struct.ilist** %gep.list.next.next, align 4
|
|
ret %struct.ilist* %loaded_ptr ; use loaded pointer
|
|
}
|
|
|
|
; Function Attrs: inaccessiblememonly nounwind
|
|
declare noalias noundef align 8 i8* @malloc(i32 noundef) local_unnamed_addr #0
|
|
|
|
attributes #0 = { inaccessiblememonly nounwind}
|