https://bugs.llvm.org/show_bug.cgi?id=49873
Bug ID: 49873
Summary: NewGVN miscompile and crash
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 24727
--> https://bugs.llvm.org/attachment.cgi?id=24727&action=edit
IR reproducer
NewGVN fails to add extra dependency when processing an icmp with one operand
being phi-node. it tries to evaluate a phi-of-icmp and later one of the icmp
proved to be constant based on a previous predicate, see the code after big
piece of comment in NewGVN::performSymbolicCmpEvaluation(). We need to make
sure the dependency between the real instruction and the predicate condition
was added.
opt -S -newgvn -o - reproduce.ll
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