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9254ae141b
If a switch was in an unreachable block that branched to a block with a phi, it would leave phis with missing predecessors. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301064 91177308-0d34-0410-b5e6-96231b3b80d8
41 lines
1.0 KiB
LLVM
41 lines
1.0 KiB
LLVM
; RUN: opt -S -lowerswitch %s | FileCheck %s
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; CHECK-LABEL: @phi_in_dead_block(
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; CHECK-NOT: switch
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define void @phi_in_dead_block() {
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bb:
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br i1 undef, label %bb2, label %bb3
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bb1: ; No predecessors!
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switch i32 undef, label %bb2 [
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i32 9, label %bb3
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]
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bb2: ; preds = %bb1, %bb
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%tmp = phi i64 [ undef, %bb1 ], [ undef, %bb ]
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unreachable
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bb3: ; preds = %bb1, %bb
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unreachable
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}
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; CHECK-LABEL: @phi_in_dead_block_br_to_self(
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; CHECK-NOT: switch
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define void @phi_in_dead_block_br_to_self() {
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bb:
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br i1 undef, label %bb2, label %bb3
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bb1: ; No predecessors!
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switch i32 undef, label %bb2 [
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i32 9, label %bb3
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i32 10, label %bb1
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]
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bb2: ; preds = %bb1, %bb
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%tmp = phi i64 [ undef, %bb1 ], [ undef, %bb ]
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unreachable
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bb3: ; preds = %bb1, %bb
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unreachable
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}
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