[Bug c/44546] New: 4.5 ICE with -ffast-math -Os (compiling graphviz)

[chexum at gmail dot com]

libtool: compile:  gcc -v -save-temps -DHAVE_CONFIG_H -I. -I../.. -I../..
-I../../lib/common -I../../lib/gvc -I../../lib/pack -I../../lib/ortho
-I../../lib/pathplan -I../../lib/graph -I../../lib/sparse -I../../lib/rbtree
-I../../lib/sfdpgen -I../../lib/cdt -Os -Wall -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64 -Wno-unknown-pragmas -Wstrict-prototypes -Wpointer-arith
-Wall -ffast-math -MT stress.lo -MD -MP -MF .deps/stress.Tpo -c stress.c  -fPIC
-DPIC -o .libs/stress.o
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i586-pc-linux-gnu/4.5.0/lto-wrapper
Target: i586-pc-linux-gnu
Configured with: ..//configure --prefix=/usr --libexecdir=/usr/lib
--enable-shared --with-system-zlib
--enable-languages=c,c++,objc,java,ada,fortran --enable-threads
--enable-__cxa_atexit --enable-clocale=gnu --enable-libada --enable-shared
--with-ecj-jar=/usr/share/java/ecj.jar i586-pc-linux-gnu
Thread model: posix
gcc version 4.5.0 (GCC)
...
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-DHAVE_CONFIG_H' '-I.' '-I../..'
'-I../..' '-I../../lib/common' '-I../../lib/gvc' '-I../../lib/pack'
'-I../../lib/ortho' '-I../../lib/pathplan' '-I../../lib/graph'
'-I../../lib/sparse' '-I../../lib/rbtree' '-I../../lib/sfdpgen'
'-I../../lib/cdt' '-Os' '-D_LARGEFILE_SOURCE' '-D_FILE_OFFSET_BITS=64'
'-Wno-unknown-pragmas' '-Wstrict-prototypes' '-Wpointer-arith' '-Wall'
'-ffast-math' '-MT' 'stress.lo' '-MD' '-MP' '-MF' '.deps/stress.Tpo' '-c'
'-fPIC' '-DPIC' '-o' '.libs/stress.o' '-mtune=pentium' '-march=pentium'
 /usr/lib/gcc/i586-pc-linux-gnu/4.5.0/cc1 -fpreprocessed stress.i -quiet
-dumpbase stress.c -mtune=pentium -march=pentium -auxbase-strip .libs/stress.o
-Os -Wno-unknown-pragmas -Wstrict-prototypes -Wpointer-arith -Wall -version
-ffast-math -fPIC -o stress.s
GNU C (GCC) version 4.5.0 (i586-pc-linux-gnu)
        compiled by GNU C version 4.5.0, GMP version 5.0.1, MPFR version 2.4.2,
MPC version 0.8.1
GGC heuristics: --param ggc-min-expand=98 --param ggc-min-heapsize=127922
GNU C (GCC) version 4.5.0 (i586-pc-linux-gnu)
        compiled by GNU C version 4.5.0, GMP version 5.0.1, MPFR version 2.4.2,
MPC version 0.8.1
GGC heuristics: --param ggc-min-expand=98 --param ggc-min-heapsize=127922
Compiler executable checksum: 7fe8daf58b4922cb9313351112738768
stress.c: In function &#65533;<80><98>mdsModel&#65533;<80><99>:
stress.c:1373:12: warning: &#65533;<80><98>delta&#65533;<80><99> may be used
uninitialized in this function
stress.c: In function
&#65533;<80><98>compute_apsp_artifical_weights_packed&#65533;<80><99>:
stress.c:1494:1: error: unrecognizable insn:
(jump_insn 445 444 315 11 stress.c:1454 (set (pc)
        (if_then_else (lt (reg:CCFP 17 flags)
                (const_int 0 [0x0]))
            (label_ref:SI 303)
            (pc))) -1 (expr_list:REG_BR_PROB (const_int 2900 [0xb54])
        (nil))
 -> 303)
stress.c:1494:1: internal compiler error: in extract_insn, at recog.c:2103
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


-- 
           Summary: 4.5 ICE with -ffast-math -Os (compiling graphviz)
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: chexum at gmail dot com
 GCC build triplet: i586-pc-linux-gnu
  GCC host triplet: i586-pc-linux-gnu
GCC target triplet: i586-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44546