[Bug middle-end/54963] New: Wrong code generated for libgfortran/generated/eoshift3_8.c on SH

[kkojima at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54963



             Bug #: 54963

           Summary: Wrong code generated for

                    libgfortran/generated/eoshift3_8.c on SH

    Classification: Unclassified

           Product: gcc

           Version: 4.8.0

            Status: UNCONFIRMED

          Keywords: wrong-code

          Severity: normal

          Priority: P3

         Component: middle-end

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

        ReportedBy: kkoj...@gcc.gnu.org

            Target: sh*-*-*





Created attachment 28469

  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28469

A test case



Several fortran tests using some eoshift functions fail on

sh4-unknown-linux-gnu for a while.  The above test case is

a reduced one which fails sh-elf with -O2 -ml -m4.  The right

result would be "adhbeh..." but it wrongly returns "ticzzz...".

It seems that the compiler allocates a stack slot at r15+60

for "len" variable first for the line 126:



   len = ((array)->dim[dim]._ubound + 1 - (array)->dim[dim].lower_bound);



then computes len - abs (sh) for the line 184;



   for (n = 0; n < len - delta; n++)



using "len" variable at r15+68.  The error went away with

-fno-ira-share-spill-slots.