http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54522
Bug #: 54522
Summary: Using "g77 -O -fno-automatic", reassignment of a
variable in an if statement in a function triggers a
compiler bug.
Classification: Unclassified
Product: gcc
Version: 3.4.6
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: a...@psu.edu
C g77 bug found 9/7/2012.
C When command "g77 -c -O -fno-automatic reasssignment_bug.for" is
C used on the included code, the following is produced:
C
C reassignment_bug.for: In function `dum':
C In file included from reassignment_bug.for:0:
C reassignment_bug.for:7: internal compiler error: in gen_reg_rtx, at
C emit-rtl.c:819
C Please submit a full bug report,
C with preprocessed source if appropriate.
C See <URL:http://bugzilla.redhat.com/bugzilla> for instructions.
C
C The code is non-sensical but valid and should not crash the compiler.
C The logic was found in a larger more complex piece of code where the
C cause was hard to find.
C
C Compiler version from "g77 -v":
C Reading specs from /usr/lib/gcc/x86_64-redhat-linux/3.4.6/specs
C Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
C --infodir=/usr/share/info --enable-shared --enable-threads=posix
C --disable-checking --with-system-zlib --enable-__cxa_atexit
C --disable-libunwind-exceptions --enable-languages=c,c++,f77
C --disable-libgcj --host=x86_64-redhat-linux
C Thread model: posix
C gcc version 3.4.6 20060404 (Red Hat 3.4.6-19.el6)
C
FUNCTION DUM(A)
B=A
IF (B.EQ.1) B=A
DUM=B
RETURN
END
