Maybe related to PR11717.

I think this is a regression from 3.3. Compiling Python-2.3 on alpha-linux fails
. Rechecked with 3.3 CVS 20030728.

gcc version 3.3.1 20030722 (Debian prerelease)
 /usr/lib/gcc-lib/alpha-linux/3.3.1/cc1 -E -quiet -v -I. -I./Include
-D__GNUC__=3 -D__GNUC_MINOR__=3 -D__GNUC_PATCHLEVEL__=1 -D__ELF__ -DNDEBUG
-DPy_BUILD_CORE Objects/classobject.c -Wall -Wstrict-prototypes
-fno-strict-aliasing -O3 classobject.i
ignoring nonexistent directory "/usr/alpha-linux/include"
#include "..." search starts here:
#include <...> search starts here:
 .
 Include
 /usr/local/include
 /usr/lib/gcc-lib/alpha-linux/3.3.1/include
 /usr/include
End of search list.
 /usr/lib/gcc-lib/alpha-linux/3.3.1/cc1 -fpreprocessed classobject.i -quiet
-dumpbase classobject.c -auxbase-strip Objects/classobject.o -g -O3 -Wall
-Wstrict-prototypes -version -fno-strict-aliasing -o classobject.s
GNU C version 3.3.1 20030722 (Debian prerelease) (alpha-linux)
        compiled by GNU C version 3.3.1 20030722 (Debian prerelease).
GGC heuristics: --param ggc-min-expand=64 --param ggc-min-heapsize=64394
Objects/classobject.c: In function `instance_compare':
Objects/classobject.c:1629: error: unrecognizable insn:
(insn 34 33 477 3 0x20000d8a9f8 (set (reg/f:DI 79)
        (symbol_ref:DI ("@LPyInstance_Type"))) -1 (nil)
    (expr_list:REG_EQUAL (symbol_ref:DI ("@LPyInstance_Type"))
        (nil)))
Objects/classobject.c:1629: internal compiler error: in extract_insn, at
recog.c:2175
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

Reverting to -O2 lets the file compile