4810051a82
The pruning cloner already tries to remove unreachable blocks. The original cloning process will simplify instructions and constant terminators, and only clone blocks that are reachable at that point. However, phi nodes can only be simplified after everything has been cloned. For that reason, additional blocks may become unreachable after phi simplification. The code does try to handle this as well, but only removes blocks that don't have predecessors. It misses unreachable cycles. This can cause issues if SEH exception handling code is part of an unreachable cycle, as the inliner is not prepared to deal with that. This patch instead performs an explicit scan for reachable blocks, and drops everything else. Fixes https://github.com/llvm/llvm-project/issues/53206. Differential Revision: https://reviews.llvm.org/D118449
52 lines
1.0 KiB
LLVM
52 lines
1.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -inline < %s | FileCheck %s
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; Check that the exception handling code is fully pruned, and does not
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; leave behind invalid IR.
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define internal void @foo() personality i32 (...)* undef {
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entry:
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br i1 false, label %join, label %split
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split:
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br label %join
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join:
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%phi = phi i64 [ 1, %split ], [ 0, %entry ]
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%cmp = icmp ugt i64 1, %phi
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br i1 %cmp, label %invoke1, label %exit
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invoke1:
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invoke void undef()
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to label %exit unwind label %cleanup1
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cleanup1:
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%pad1 = cleanuppad within none []
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br label %cleanup1.cont
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cleanup1.cont:
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br i1 undef, label %cleanupret, label %invoke2
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invoke2:
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invoke void undef() [ "funclet"(token %pad1) ]
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to label %cleanup1.cont unwind label %cleanup2
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cleanup2:
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%pad2 = cleanuppad within %pad1 []
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unreachable
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cleanupret:
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unreachable
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exit:
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ret void
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}
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define void @test() personality i32 (...)* undef {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: ret void
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;
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call void @foo()
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ret void
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}
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