https://bugs.llvm.org/show_bug.cgi?id=47486
Bug ID: 47486
Summary: Unreported changes from rewriteLoopExitValues
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Transformation Utilities
Assignee: unassignedb...@nondot.org
Reporter: dma...@mozilla.com
CC: lebedev...@gmail.com, llvm-bugs@lists.llvm.org,
sguel...@redhat.com
Created attachment 23946
--> https://bugs.llvm.org/attachment.cgi?id=23946&action=edit
SwitchLoweringUtils.ll
With expensive checks enabled:
$ opt -indvars -S SwitchLoweringUtils.ll
Pass modifies its input and doesn't report it: Induction Variable
Simplification
With some early returns in IndVarSimplify.cpp, I narrowed it down to
rewriteLoopExitValues, but I'm not sure about the specific line.
It's unclear if bugpoint did something bad here: the only predecessor of the
`ret` is the first instruction, so everything in between is an infinite loop. I
can share the original repro if that's better.
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