[Bug middle-end/52886] New: [4.8 Regression] FAIL: gcc.dg/torture/pr36978.c -On (internal compiler error), n=1 and above

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52886

             Bug #: 52886
           Summary: [4.8 Regression] FAIL: gcc.dg/torture/pr36978.c  -On
                    (internal compiler error), n=1 and above
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: domi...@lps.ens.fr
                CC: ia...@gcc.gnu.org, rgue...@gcc.gnu.org,
                    wschm...@gcc.gnu.org
            Target: powerpc*-*-* s390-ibm-linux-gnu


Between revisions 186092 (OK, see
http://gcc.gnu.org/ml/gcc-testresults/2012-04/msg00234.html) and 186108 (see
http://gcc.gnu.org/ml/gcc-testresults/2012-04/msg00277.html), compiling
gcc.dg/torture/pr36978.c on powerpc*-*-* and s390-ibm-linux-gnu has stated to
give an ICE:

FAIL: gcc.dg/torture/pr36978.c  -O1  (internal compiler error)
FAIL: gcc.dg/torture/pr36978.c  -O1  (test for excess errors)
FAIL: gcc.dg/torture/pr36978.c  -O2  (internal compiler error)
FAIL: gcc.dg/torture/pr36978.c  -O2  (test for excess errors)
FAIL: gcc.dg/torture/pr36978.c  -O3 -fomit-frame-pointer  (internal compiler
error)
FAIL: gcc.dg/torture/pr36978.c  -O3 -fomit-frame-pointer  (test for excess
errors)
FAIL: gcc.dg/torture/pr36978.c  -O3 -fomit-frame-pointer -funroll-loops 
(internal compiler error)
FAIL: gcc.dg/torture/pr36978.c  -O3 -fomit-frame-pointer -funroll-loops  (test
for excess errors)
FAIL: gcc.dg/torture/pr36978.c  -O3 -fomit-frame-pointer -funroll-all-loops
-finline-functions  (internal compiler error)
FAIL: gcc.dg/torture/pr36978.c  -O3 -fomit-frame-pointer -funroll-all-loops
-finline-functions  (test for excess errors)
FAIL: gcc.dg/torture/pr36978.c  -O3 -g  (internal compiler error)
FAIL: gcc.dg/torture/pr36978.c  -O3 -g  (test for excess errors)
FAIL: gcc.dg/torture/pr36978.c  -O2 -flto -flto-partition=none  (internal
compiler error)
FAIL: gcc.dg/torture/pr36978.c  -O2 -flto -flto-partition=none  (test for
excess errors)
FAIL: gcc.dg/torture/pr36978.c  -O2 -flto  (internal compiler error)
FAIL: gcc.dg/torture/pr36978.c  -O2 -flto  (test for excess errors)

The ICE is

[karma] f90/bug% gcc48 -O1 /opt/gcc/work/gcc/testsuite/gcc.dg/torture/pr36978.c
/opt/gcc/work/gcc/testsuite/gcc.dg/torture/pr36978.c: In function 'foo':
/opt/gcc/work/gcc/testsuite/gcc.dg/torture/pr36978.c:5:6: error: AUX pointer
initialized for edge 3->4
/opt/gcc/work/gcc/testsuite/gcc.dg/torture/pr36978.c:5:6: internal compiler
error: verify_ssa failed