[Bug rtl-optimization/40587] New: ICE in emit_swap_insn at reg-stack.c:827

[pmblakely at googlemail dot com]

See attached test-case, test.f:

> gfortran -c test.f -O1
Compiles OK

> gfortran -c test.f -O2
test.f: In function "test":
test.f:13: internal compiler error: in emit_swap_insn, at reg-stack.c:827

> gfortran -v
Using built-in specs.
Target: i586-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla
--enable-bootstrap --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk
--disable-dssi --enable-plugin
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre
--enable-libgcj-multifile --enable-java-maintainer-mode
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib
--with-ppl --with-cloog --with-tune=generic --with-arch=i586
--build=i586-redhat-linux
Thread model: posix
gcc version 4.4.0 20090506 (Red Hat 4.4.0-4) (GCC) 

> uname -a
Linux pmblakely 2.6.29.5-191.fc11.i686.PAE #1 SMP Tue Jun 16 23:19:53 EDT 2009
i686 i686 i386 GNU/Linux

This looks similar to the test-case for bug 39607 (fixed), in that the ICE
occurs when returned/class variables are only updated if a certain condition
holds, and otherwise a separate function is called, resulting in those
variables not being updated.

Note that the test-case for bug 39607 compiles correctly (i.e. no ICE) for this
version of gcc, so it's not a case of that patch not having gone through for
this compiler version.


-- 
           Summary: ICE in emit_swap_insn at reg-stack.c:827
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pmblakely at googlemail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40587