13a97305ba
Fixes https://bugs.llvm.org/show_bug.cgi?id=44922 (caused by 4698bf145d583e26ed438026ef7fde031ef322b1) ThreadThroughTwoBasicBlocks assumes PredBBBranch is conditional. The following code can segfault. AddPHINodeEntriesForMappedBlock(PredBBBranch->getSuccessor(1), PredBB, NewBB, ValueMapping); We can also allow unconditional PredBB, but the produced code is not better. Reviewed By: kazu Differential Revision: https://reviews.llvm.org/D74747
43 lines
1.4 KiB
LLVM
43 lines
1.4 KiB
LLVM
;; Test that we skip unconditional PredBB when threading jumps through two
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;; successive basic blocks.
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; RUN: opt -S -passes='function(jump-threading)' < %s | FileCheck %s
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @f(i32* %0) {
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; CHECK-LABEL: @f
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; CHECK: br i1 %good, label %pred.bb, label %pred.pred.bb
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entry:
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%size = call i64 @get_size(i32* %0)
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%good = icmp ugt i64 %size, 3
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br i1 %good, label %pred.bb, label %pred.pred.bb
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; CHECK: pred.pred.bb:
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; CHECK: br label %pred.bb
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; CHECK: pred.bb:
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; CHECK: br label %bb
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; CHECK: bb:
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pred.pred.bb: ; preds = %entry
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call void @effect()
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br label %pred.bb
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pred.bb: ; preds = %pred.pred.bb, %entry
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%v = load i32, i32* %0
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br label %bb
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bb: ; preds = %pred.bb
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call void @effect1(i8* blockaddress(@f, %bb))
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br i1 %good, label %cont2, label %cont1
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cont1: ; preds = %bb
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br i1 %good, label %exit, label %cont2
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cont2: ; preds = %bb
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br label %exit
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exit: ; preds = %cont1, %cont2
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ret i32 %v
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}
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declare i64 @get_size(i32*)
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declare void @effect()
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declare void @effect1(i8*)
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