[Bug c/67004] New: valgrind error in recog_memoized & shorten_branches

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67004

            Bug ID: 67004
           Summary: valgrind error in recog_memoized & shorten_branches
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Using today's gcc trunk code, I tried another build
with valgrind. I got

/home/dcb/gcc/working/./gcc/xgcc -B/home/dcb/gcc/working/./gcc/
-B/home/dcb/gcc/results/x86_64-unknown-linux-gnu/bin/
-B/home/dcb/gcc/results/x86_64-unknown-linux-gnu/lib/ -isystem
/home/dcb/gcc/results/x86_64-unknown-linux-gnu/include -isystem
/home/dcb/gcc/results/x86_64-unknown-linux-gnu/sys-include    -g -O2 -O2  -g
-O2 -DIN_GCC    -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual
-Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem
./include   -fpic -mlong-double-80 -DUSE_ELF_SYMVER -g -DIN_LIBGCC2
-fbuilding-libgcc -fno-stack-protector   -fpic -mlong-double-80
-DUSE_ELF_SYMVER -I. -I. -I../.././gcc -I../../../src/trunk/libgcc
-I../../../src/trunk/libgcc/. -I../../../src/trunk/libgcc/../gcc
-I../../../src/trunk/libgcc/../include
-I../../../src/trunk/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT
-DHAVE_CC_TLS  -DUSE_TLS -Wno-missing-prototypes -Wno-type-limits -o multf3.o
-MT multf3.o -MD -MP -MF multf3.dep  -c
../../../src/trunk/libgcc/soft-fp/multf3.c -fvisibility=hidden -DHIDE_EXPORTS
==14694== Conditional jump or move depends on uninitialised value(s)
==14694==    at 0x7594C5: recog_memoized (recog.h:167)
==14694==    by 0x7594C5: shorten_branches(rtx_insn*) (final.c:1203)
==14694==    by 0x759BCF: rest_of_handle_shorten_branches (final.c:4541)
==14694==    by 0x759BCF: (anonymous
namespace)::pass_shorten_branches::execute(function*) (final.c:4570)


recog.h:167 is

 if (INSN_CODE (insn) < 0)

Configure line is

../src/trunk/configure --prefix=/home/dcb/gcc/results \
        --disable-werror \
        --disable-multilib \
        --enable-checking=valgrind \
        --disable-bootstrap \
        --enable-languages=c,c++,fortran