GNU Fortran fails on powerpc-linux with "-O2 -ftree-loop-linear" with an ICE
for this testcase, minimized from swim.f in SPEC CPU2000:
SUBROUTINE BUG
INTEGER I, J, M
REAL V
COMMON A(100,100), B(100,100), M, V
DO 200 I = 1, M
DO 100 J = 1, M
V = V + A(I,J)
100 CONTINUE
B(I,I) = B(I,I) * I
200 CONTINUE
STOP
END
The output is:
elm3b11% /opt/gcc-nightly/trunk/bin/gfortran -c -O2 -ftree-loop-linear bug.f
bug.f: In function bug:
bug.f:1: internal compiler error: in execute_todo, at passes.c:714
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
A regression hunt identified this patch:
http://gcc.gnu.org/viewcvs?view=rev&rev=113862
r113862 | spop | 2006-05-17 14:25:59 +0000 (Wed, 17 May 2006)
The same patch also introduces memory exhaustion failures when compiling equake
or ammp from SPEC CPU2000 on powerpc64-linux with "-O2 -ftree-loop-linear" and
either -m32 or -m64, and for applu with those options and -m64. I don't have a
minimized testcase for any of those.
--
Summary: ICE in execute_todo with -O2 -ftree-loop-linear
Product: gcc
Version: 4.2.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: janis at gcc dot gnu dot org
GCC target triplet: powerpc-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27745
