[Bug middle-end/47725] [x32] error: unable to find a register to spill in class DIREG

["pbone at csse dot unimelb.edu.au" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47725

--- Comment #20 from Paul Bone <pbone at csse dot unimelb.edu.au> 2011-07-22 06:07:11 UTC ---
Created attachment 24808
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24808
Test case generated by Mercury Compiler

This is a test case generated by the Mercury compiler, it has been reduced just
enough code to cause the bug to occur.  It can be reproduced in gcc 4.4 and 4.6
at an optimization level of -O1 but not -O0.  The output of GCC is:

paul@semillion:~/code/mercury-compiler-rotd-2011-06-23/compiler$ gcc-4.4 -v -c
-o /tmp/out.o -O1 ml_backend.ml_closure_gen.i
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.4.5-8'
--with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.4 --enable-shared --enable-multiarch
--enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.4 --libdir=/usr/lib --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc
--enable-targets=all --with-arch-32=i586 --with-tune=generic
--enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu
--target=i486-linux-gnu
Thread model: posix
gcc version 4.4.5 (Debian 4.4.5-8)
COLLECT_GCC_OPTIONS='-v' '-c' '-o' '/tmp/out.o' '-O1' '-mtune=generic'
'-march=i586'
 /usr/lib/gcc/i486-linux-gnu/4.4.5/cc1 -fpreprocessed
ml_backend.ml_closure_gen.i -quiet -dumpbase ml_backend.ml_closure_gen.i
-mtune=generic -march=i586 -auxbase-strip /tmp/out.o -O1 -version -o
/tmp/ccbABR7o.s
GNU C (Debian 4.4.5-8) version 4.4.5 (i486-linux-gnu)
        compiled by GNU C version 4.4.5, GMP version 4.3.2, MPFR version
3.0.0-p3.
GGC heuristics: --param ggc-min-expand=98 --param ggc-min-heapsize=127992
Compiler executable checksum: 0192d925385d4e6642a93c63f245f907
ml_backend.ml_closure_gen.c:32: warning:
âmercury__ml_backend__ml_closure_gen__ml_gen_maybe_pseudo_type_info_defn_4_0â
used but never defined
ml_backend.ml_closure_gen.c: In function âml_backend__ml_closure_gen_module11â:
ml_backend.ml_closure_gen.c:230: error: unable to find a register to spill in
class âDIREGâ
ml_backend.ml_closure_gen.c:230: error: this is the insn:
(insn 123 122 124 11 ml_backend.ml_closure_gen.c:105 (parallel [
            (set (mem:SI (reg/f:SI 136) [0 S4 A32])
                (reg/v:SI 80 [ MR_tempr3 ]))
            (set (reg/v:SI 82 [ MR_tempr1 ])
                (plus:SI (reg/f:SI 136)
                    (const_int 4 [0x4])))
        ]) 852 {*strsetsi_1} (expr_list:REG_DEAD (reg/f:SI 136)
        (nil)))
ml_backend.ml_closure_gen.c:230: confused by earlier errors, bailing out
Preprocessed source stored into /tmp/cccXoZX2.out file, please attach this to
your bugreport.