[Bug target/52113] New: [4.7 regression][avr] ICE: in extract_insn, at recog.c:2123

["mhlavink at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52113

             Bug #: 52113
           Summary: [4.7 regression][avr] ICE: in extract_insn, at
                    recog.c:2123
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: mhlavink@redhat.com


gcc 4.7 fails on code that was working in 4.6 without any problem

Version: 4.7.0-20120128
Target: avr

Problem happens only when optimization is used.

Pre-processed reproducer:
============= cut =================
typedef unsigned int uint8_t __attribute__((__mode__(__QI__)));
typedef unsigned int uint16_t __attribute__ ((__mode__ (__HI__)));
typedef unsigned int uint32_t __attribute__ ((__mode__ (__SI__)));

extern uint32_t inacCounter;
uint8_t inactivityTimer;

int main()
{
    if(inacCounter>((uint32_t)inactivityTimer*1000)) inacCounter=0;
}
============= cut =================

$ avr-g++ -c -mmcu=atmega64 reproducer.cpp -O1
reproducer.cpp: In function 'int main()':
reproducer.cpp:11:1: error: unrecognizable insn:
(insn 26 6 27 2 (set (concatn:HI [
                (reg:QI 57)
                (reg:QI 58 [+1 ])
            ])
        (zero_extend:HI (reg:QI 48 [ inactivityTimer ]))) reproducer.cpp:10 -1
     (nil))
reproducer.cpp:11:1: internal compiler error: in extract_insn, at recog.c:2123
Please submit a full bug report,
with preprocessed source if appropriate.


Additional information:
$ avr-gcc -v
Using built-in specs.
COLLECT_GCC=avr-gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/avr/4.7.0/lto-wrapper
Target: avr
Configured with: ../gcc-4.7-20120128/configure --prefix=/usr
--mandir=/usr/share/man --infodir=/usr/share/info --target=avr
--enable-languages=c,c++ --disable-nls --disable-libssp --with-system-zlib
--enable-version-specific-runtime-libs --with-pkgversion='Fedora 4.7-2.fc16'
--with-bugurl=https://bugzilla.redhat.com/
Thread model: single
gcc version 4.7.0 20120128 (experimental) (Fedora 4.7-2.fc16)