[LLVMbugs] [Bug 19727] New: llvm creates a really large constantexpr and spends a lot of time on it

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19727

            Bug ID: 19727
           Summary: llvm creates a really large constantexpr and spends a
                    lot of time on it
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Interprocedural Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: rafael.espindola at gmail.com
                CC: benny.kra at gmail.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 12510
  --> http://llvm.org/bugs/attachment.cgi?id=12510&action=edit
testcase

This is some variation of PR15714.

This can be reproduced by running

./bin/opt -basicaa  -inline  -simplifycfg -instcombine -loop-rotate -licm
-indvars -gvn test.ll -o test.bc

Looks like the slow part is actually writing the bitcode.

Tested with r208570.

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