46e04f7fe5
When determining the replacement access during cloning, we currently leave accesses for instructions that are not in the VMap alone. This is correct if the instruction is not in VMap because it hasn't been cloned, but not if it has been cloned and then removed. In that case, we should walk up to the defining access, like in other simplification cases. To distinguish the two cases, pass in a callback that queries whether the instruction is part of the cloned region. An alternative to this would be to delay removal of dead instructions in SimpleLoopUnswitch until after MSSA cloning. Fixes https://github.com/llvm/llvm-project/issues/116228.
38 lines
960 B
LLVM
38 lines
960 B
LLVM
; RUN: opt -disable-output -passes="loop-mssa(loop-rotate),print<memoryssa>" -verify-memoryssa < %s 2>&1 | FileCheck %s
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; CHECK: entry:
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; CHECK-NEXT: 3 = MemoryDef(liveOnEntry)
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; CHECK-NEXT: store ptr null, ptr %p, align 8
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; CHECK-NEXT: MemoryUse(3)
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; CHECK-NEXT: %val11 = load ptr, ptr %p, align 8
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; CHECK: loop.latch:
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; CHECK-NEXT: 5 = MemoryPhi({loop.latch,1},{loop.latch.lr.ph,3})
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; CHECK-NEXT: MemoryUse(5)
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; CHECK-NEXT: %val2 = load ptr, ptr %p, align 8
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; CHECK-NEXT: 1 = MemoryDef(5)
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; CHECK-NEXT: store ptr null, ptr %p, align 8
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; CHECK-NEXT: MemoryUse(1)
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; CHECK-NEXT: %val1 = load ptr, ptr %p, align 8
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; CHECK: exit:
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; CHECK-NEXT: 4 = MemoryPhi({entry,3},{loop.exit_crit_edge,1})
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define void @test(ptr %p) {
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entry:
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br label %loop
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loop:
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store ptr null, ptr %p
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%val1 = load ptr, ptr %p
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%cmp = icmp eq ptr %val1, null
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br i1 %cmp, label %exit, label %loop.latch
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loop.latch:
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%val2 = load ptr, ptr %p
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br label %loop
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exit:
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ret void
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}
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