derek.holloway
7502bf64a4
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47 lines
1.9 KiB
LLVM
47 lines
1.9 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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@BUFFER = external dso_local local_unnamed_addr global [0 x i8], align 1
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define void @MissedDSEOpportunity(i64 %idx, ptr noalias %cc) {
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;
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; The DSE pass will try to kill the store in the loop exit block using the
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; store in the function exit block. The loop invariant check on the pointer
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; used by the stores should trivially return true because a pointer defined
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; in the entry block of a function is loop invariant by definition. In fact
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; the entry block of a function cannot have predecessors or be part of a loop.
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;
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; CHECK-LABEL: @MissedDSEOpportunity(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds [0 x i8], ptr @BUFFER, i64 0, i64 [[IDX:%.*]]
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; CHECK-NEXT: [[CC0:%.*]] = load volatile i1, ptr [[CC:%.*]], align 1
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; CHECK-NEXT: br i1 [[CC0]], label [[HEAD:%.*]], label [[EXIT:%.*]]
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; CHECK: head:
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; CHECK-NEXT: [[CC1:%.*]] = load volatile i1, ptr [[CC]], align 1
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; CHECK-NEXT: br i1 [[CC1]], label [[HEAD]], label [[EXIT_LOOPEXIT:%.*]]
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; CHECK: exit.loopexit:
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; CHECK-NEXT: br label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: store i64 0, ptr [[GEP]], align 4
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; CHECK-NEXT: ret void
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;
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entry:
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; The entry block cannot have predecessors or be part of a loop
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%gep = getelementptr inbounds [0 x i8], ptr @BUFFER, i64 0, i64 %idx
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%cc0 = load volatile i1, ptr %cc, align 1
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br i1 %cc0, label %head, label %exit
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head: ; preds = %entry, %head
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%cc1 = load volatile i1, ptr %cc, align 1
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br i1 %cc1, label %head, label %exit.loopexit
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exit.loopexit: ; preds = %head
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; Dead store
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store i64 2, ptr %gep, align 4
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br label %exit
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exit: ; preds = %exit.loopexit, %entry
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; Killer store
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store i64 0, ptr %gep, align 4
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ret void
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} |