https://llvm.org/bugs/show_bug.cgi?id=31322
Bug ID: 31322
Summary: crash in FlattenCFG: MergeIfRegion
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: AMDGPU
Assignee: unassignedb...@nondot.org
Reporter: pichet2...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 17742
--> https://llvm.org/bugs/attachment.cgi?id=17742&action=edit
reduced test case
FlattenCFG seem to be used only by AMDGPU.
I found this bug by using FlattenCFG pass for another out of tree target but I
can reproduce it with AMDGPU too.
Seem like MergeIfRegion is removing a BB still referenced by a PHI node.
reduction in test.ll
opt -flattencfg -disable-output test.ll
opt will crash
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