[Bug target/64152] New: internal compiler error: in gen_add2_insn

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64152

            Bug ID: 64152
           Summary: internal compiler error: in gen_add2_insn
           Product: gcc
           Version: 4.9.3
            Status: UNCONFIRMED
          Keywords: ra
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
            Target: aarch64

Created attachment 34163
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34163&action=edit
preprocessed testcase

When compiling the attached testcase with

  -O -fPIC -fstack-protector -fomit-frame-pointer -mno-lra

I get

gen/wxe_funcs.cpp:31754:2: internal compiler error: in gen_add2_insn, at
optabs.c:4719
0xac23bb gen_add2_insn(rtx_def*, rtx_def*)
        /space/rguenther/src/svn/gcc-4_9-branch/gcc/optabs.c:4719
0xb1dbd8 gen_reload
        /space/rguenther/src/svn/gcc-4_9-branch/gcc/reload1.c:8713
0xb23327 emit_input_reload_insns
        /space/rguenther/src/svn/gcc-4_9-branch/gcc/reload1.c:7669
0xb23327 do_input_reload
        /space/rguenther/src/svn/gcc-4_9-branch/gcc/reload1.c:7955
0xb23327 emit_reload_insns
        /space/rguenther/src/svn/gcc-4_9-branch/gcc/reload1.c:8147
0xb23327 reload_as_needed
        /space/rguenther/src/svn/gcc-4_9-branch/gcc/reload1.c:4665
0xb27800 reload(rtx_def*, int)
        /space/rguenther/src/svn/gcc-4_9-branch/gcc/reload1.c:1037
0xa2b588 do_reload
        /space/rguenther/src/svn/gcc-4_9-branch/gcc/ira.c:5469
0xa2b588 rest_of_handle_reload
        /space/rguenther/src/svn/gcc-4_9-branch/gcc/ira.c:5598
0xa2b588 execute
        /space/rguenther/src/svn/gcc-4_9-branch/gcc/ira.c:5627
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

this also happens on the 4.8 branch if you backport stack-protector support
and without -mno-lra (reload is still the default there).

On trunk things have rotted faster and I run into PR64149.