Compiling this code (AMD64 under SuSE Linux Professional 9.1):
SUBROUTINE OPTBUG(N,A,LDA,B,LDB)
C .. Scalar Arguments ..
INTEGER LDA, LDB, N
C .. Array Arguments ..
REAL A(LDA,N), B(LDB,N)
C .. Local Scalars ..
REAL A1
INTEGER I, J
C .. Executable Statements ..
DO 40 J = 1, N
DO 20 I = 1, J
A1 = A(I,J)
B(I,J) = A1
20 CONTINUE
40 CONTINUE
RETURN
END
with optimization level -O2 or above, like this:
gfortran -v -Wall -O2 -c optbug.f
gives the following error message:
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc/configure --prefix=/var/tmp/gfortran-20050422/irun
--enable-languages=c,f95
Thread model: posix
gcc version 4.1.0 20050422 (experimental)
/opt/gfortran/irun/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.1.0/f951
optbug.f -ffixed-form -quiet -dumpbase optbug.f -mtune=k8 -auxbase optbug -O2
-Wall -version -o /tmp/ccGwsoUd.s
GNU F95 version 4.1.0 20050422 (experimental) (x86_64-unknown-linux-gnu)
compiled by GNU C version 3.4.2 20041017 (Red Hat 3.4.2-6.fc3).
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
optbug.f: In function ‘optbug’:
optbug.f:1: internal compiler error: in set_value_range, at tree-vrp.c:124
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
--
Summary: Internal compiler error: in set_value_range
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: mick at nag dot co dot uk
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21381
