[Bug tree-optimization/82816] New: ICE on valid code at -Os and above: in find_widening_optab_handler_and_mode, at optabs-query.c:414

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82816

            Bug ID: 82816
           Summary: ICE on valid code at -Os and above: in
                    find_widening_optab_handler_and_mode, at
                    optabs-query.c:414
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

This appears to be a recent regression. 

$ gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/home/su/software/tmp/gcc/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/home/su/software/tmp/gcc/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 8.0.0 20171102 (experimental) [trunk revision 254338] (GCC) 
$ 
$ gcctk -O1 -c small.c
$ gcc-7.2.0 -Os -c small.c
$ 
$ gcctk -Os -c small.c
during GIMPLE pass: widening_mul
small.c: In function ‘f’:
small.c:8:6: internal compiler error: in find_widening_optab_handler_and_mode,
at optabs-query.c:414
 void f ()
      ^
0xb749b8 find_widening_optab_handler_and_mode(optab_tag, machine_mode,
machine_mode, machine_mode*)
        ../../gcc-source-trunk/gcc/optabs-query.c:414
0xe0b484 insn_code
find_widening_optab_handler_and_mode<scalar_int_mode>(optab_tag,
scalar_int_mode const&, scalar_int_mode const&, scalar_int_mode*)
        ../../gcc-source-trunk/gcc/optabs-query.h:201
0xe0b484 convert_mult_to_widen
        ../../gcc-source-trunk/gcc/tree-ssa-math-opts.c:3273
0xe0f29f execute
        ../../gcc-source-trunk/gcc/tree-ssa-math-opts.c:4205
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ 


------------------------------


struct A
{
  int b:3;
} d, e;

int c;

void f ()
{
  char g = d.b * e.b;
  c = g;
}