https://bugs.llvm.org/show_bug.cgi?id=47503
Bug ID: 47503
Summary: [CodeGenPrepare] Unreported IR changes in
OptimizeExtractBits
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: dma...@mozilla.com
CC: llvm-bugs@lists.llvm.org
Created attachment 23950
--> https://bugs.llvm.org/attachment.cgi?id=23950&action=edit
OptimizeExtractBits.ll
With expensive checks enabled:
opt -codegenprepare -S OptimizeExtractBits.ll
Pass modifies its input and doesn't report it: CodeGen Prepare
The reproducer is not quite as reduced as it could be, but I need to get to a
stopping point for the week.
The `MadeChange =` should be `MadeChange |=` at
https://github.com/llvm/llvm-project/blob/06e356c81e0fce90c9a21f9f5fb7567efa51ee0f/llvm/lib/CodeGen/CodeGenPrepare.cpp#L1847
This apparently dates back to LLVM 3.5:
https://github.com/llvm/llvm-project/commit/d069f6393a7c
I haven't tested, but by inspection, this other use of `MadeChange =` also
looks suspicious:
https://github.com/llvm/llvm-project/blob/06e356c81e0fce90c9a21f9f5fb7567efa51ee0f/llvm/lib/CodeGen/CodeGenPrepare.cpp#L1153
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