afb526b3f4
Rather than iterating over users and comparing operands, iterate over uses and check operand number. Otherwise, we'll end up promoting a store twice if it has two equal operands. This can only happen with opaque pointers, as otherwise both operands differ by a level of indirection, so a bitcast would have to be involved. Fixes https://github.com/llvm/llvm-project/issues/54495.
32 lines
956 B
LLVM
32 lines
956 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -licm < %s | FileCheck %s
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; Make sure that a store of a pointer to itself is handled correctly.
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define void @test(ptr %p1, ptr %p2, ptr noalias %p3) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[P:%.*]] = phi ptr [ [[P1:%.*]], [[ENTRY:%.*]] ], [ [[P2:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[V:%.*]] = load i64, ptr [[P]], align 4
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq i64 [[V]], 0
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; CHECK-NEXT: br i1 [[CMP]], label [[LOOP]], label [[LOOP_EXIT:%.*]]
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; CHECK: loop.exit:
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; CHECK-NEXT: store ptr [[P3:%.*]], ptr [[P3]], align 8
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; CHECK-NEXT: ret void
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;
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entry:
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br label %loop
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loop:
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%p = phi ptr [ %p1, %entry ], [ %p2, %loop ]
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%v = load i64, ptr %p
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%cmp = icmp eq i64 %v, 0
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store ptr %p3, ptr %p3
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br i1 %cmp, label %loop, label %loop.exit
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loop.exit:
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ret void
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}
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