https://bugs.llvm.org/show_bug.cgi?id=40564
Bug ID: 40564
Summary: [Debuginfo] @llvm.dbg.value in loop prevents
optimization in LoopIdiomRecognize
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: pauls...@linux.vnet.ibm.com
CC: llvm-bugs@lists.llvm.org
Created attachment 21418
--> https://bugs.llvm.org/attachment.cgi?id=21418&action=edit
reduced testcase
In LoopIdiomRecognize.cpp at line 1464 there is a check
if (CurLoop->getHeader()->size() != IdiomCanonicalSize ...
It seems that a llvm.dbg.value affects the header size value, and so prevents
this optimization. If they are removed from the loop (bb8) in the test case,
the loop is later removed.
bin/opt -mtriple=systemz-unknown -mcpu=z13 -S tc_loopidioms_delete.ll -o -
-loop-idiom -loop-deletion
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