[Bug other/38779] New: [4.3/4.4 regression] ICE with -fschedule-insns -O1

["tim at klingt dot org" <gcc-bugzilla at gcc dot gnu dot org>]

using gcc-4.3 and 4.4, with -O1 -fschedule-insns, leads to an ICE. gcc-4.2
compiles the code fine:

Source/server/scsynth_main.cpp: In function 'int main(int, char**)':
Source/server/scsynth_main.cpp:364: error: unable to find a register to spill
in class 'SIREG'
Source/server/scsynth_main.cpp:364: error: this is the insn:
(insn 593 590 595 85 Source/server/scsynth_main.cpp:236 (parallel [
            (set (reg:CC 17 flags)
                (compare:CC (mem:BLK (reg/f:DI 1 dx [orig:191 iftmp.58 ] [191])
[0 A8])
                    (mem/s/j:BLK (reg/f:DI 236) [0 A8])))
            (use (reg:DI 237))
            (use (const_int 1 [0x1]))
            (clobber (reg/f:DI 1 dx [orig:191 iftmp.58 ] [191]))
            (clobber (reg/f:DI 5 di [192]))
            (clobber (reg:DI 2 cx [193]))
        ]) 861 {*cmpstrnqi_nz_rex_1} (expr_list:REG_DEAD (reg/f:DI 1 dx
[orig:191 iftmp.58 ] [191])
        (expr_list:REG_UNUSED (reg:DI 2 cx [193])
            (expr_list:REG_UNUSED (reg/f:DI 5 di [192])
                (expr_list:REG_UNUSED (reg/f:DI 1 dx [orig:191 iftmp.58 ]
[191])
                    (nil))))))
Source/server/scsynth_main.cpp:364: internal compiler error: in spill_failure,
at reload1.c:2093
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

g++ -v:
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../gcc.git/configure -v --enable-languages=c,c++
--prefix=/usr/local/lib/gcc-snapshot --enable-shared --with-system-zlib
--disable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-gtk-cairo
--disable-plugin --enable-objc-gc --enable-mpfr --disable-werror
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.4.0 20090106 (experimental) (GCC)


-- 
           Summary: [4.3/4.4 regression] ICE with -fschedule-insns -O1
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tim at klingt dot org
 GCC build triplet: x86_64-linux-gnu
  GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38779