[Bug rtl-optimization/55464] New: lra chooses alternatives with empty register classes

[amylaar at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55464



             Bug #: 55464

           Summary: lra chooses alternatives with empty register classes

    Classification: Unclassified

           Product: gcc

           Version: 4.8.0

            Status: UNCONFIRMED

          Severity: normal

          Priority: P3

         Component: rtl-optimization

        AssignedTo: unassig...@gcc.gnu.org

        ReportedBy: amyl...@gcc.gnu.org





lra chooses instruction alternatives with empty register classes, which

causes it to reload the reload over and over again, till it eventually

bails out with:

conftest.c:7:2: internal compiler error: Max. number of generated reload insns

per insn is achieved (90)