[Bug rtl-optimization/55006] [4.8 Regression] aermod.f90 is miscompiled with '-m64 -O2 -funroll-loops' after revision 192526

[krebbel at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55006

Andreas Krebbel <krebbel at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |krebbel at gcc dot gnu.org

--- Comment #10 from Andreas Krebbel <krebbel at gcc dot gnu.org> 2012-12-05 11:56:03 UTC ---
The attached testcase gets miscompiled starting with that revision.

cc1  -fpreprocessed -quiet  -O2 -march=z196 -funroll-loops  t.c 

Perl_lex_start:
.LFB0:
    stgrl    %r2,PL_linestr
    tm    13(%r2),128
    stmg    %r14,%r15,112(%r15)
.LCFI0:
    lay    %r15,-168(%r15)
.LCFI1:
    jne    .L6
    l    %r0,12            <------ broken (access to absolute address 12)
    lgrl    %r2,PL_linestr
.L2:
    tmlh    %r0,4
    jne    .L1
    la    %r3,160(%r15)
    lghi    %r4,2
    brasl    %r14,Perl_sv_2pv_flags
.L1:
    lmg    %r14,%r15,280(%r15)
.LCFI2:
    br    %r14
.L6:
.LCFI3:
    brasl    %r14,Perl_sv_2mortal
    stgrl    %r2,PL_linestr
    l    %r0,12(%r2)
    j    .L2