[LLVMbugs] [Bug 18996] New: Changing regalloc order breaks "lencod" on native arm linux builds.

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Thu Feb 27 13:35:56 PST 2014


            Bug ID: 18996
           Summary: Changing regalloc order breaks "lencod" on native arm
                    linux builds.
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: atrick at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The LNT run of lencod broke here:

After this commit:

Author: atrick
Date: Wed Feb 26 16:07:26 2014
New Revision: 202304

URL: http://llvm.org/viewvc/llvm-project?rev=202304&view=rev
Add a limit to the heuristic that register allocates instructions in local

This handles pathological cases in which we see 2x increase in spill
code for large blocks (~50k instructions). I don't have a unit test
for this behavior.

Fixes rdar://16072279.


There is a downstream codegen bug that is only exposed by a certain register
allocation order, and only currently reproducible on native arm linux builds.

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