[Bug bootstrap/99920] New: [10 regression] ICE building gcc 10 on power 7 BE

["seurer at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99920

            Bug ID: 99920
           Summary: [10 regression] ICE building gcc 10 on power 7 BE
           Product: gcc
           Version: 10.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at gcc dot gnu.org
  Target Milestone: ---

g:6aa75d3740c309aeead9c430a6779f4a347f4403, r10-9659

This occurs at this commit but it is not the source of it (I am still looking).

Configure used:  /home/seurer/gcc/git/gcc-10-test/configure
--enable-languages=c,fortran,c++ --with-cpu=power7 --enable-bootstrap
--enable-multilib

A whole bunch of ICEs like the following occur when building gcc on power 7 BE.
 It does not occurs on power 8 BE.

/home/seurer/gcc/git/build/gcc-10-test/./gcc/xgcc
-B/home/seurer/gcc/git/build/gcc-10-test/./gcc/
-B/home/seurer/gcc/git/install/gcc-10-test/powerpc64-unknown-linux-gnu/bin/
-B/home/seurer/gcc/git/install/gcc-10-test/powerpc64-unknown-linux-gnu/lib/
-isystem
/home/seurer/gcc/git/install/gcc-10-test/powerpc64-unknown-linux-gnu/include
-isystem
/home/seurer/gcc/git/install/gcc-10-test/powerpc64-unknown-linux-gnu/sys-include
  -fno-checking -g -O2 -m32 -O2  -g -O2 -DIN_GCC    -W -Wall -Wwrite-strings
-Wcast-qual -Wno-format -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition  -isystem ./include   -fPIC -mlong-double-128
-mno-minimal-toc -g -DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector   -fPIC
-mlong-double-128 -mno-minimal-toc -I. -I. -I../../.././gcc
-I/home/seurer/gcc/git/gcc-10-test/libgcc
-I/home/seurer/gcc/git/gcc-10-test/libgcc/.
-I/home/seurer/gcc/git/gcc-10-test/libgcc/../gcc
-I/home/seurer/gcc/git/gcc-10-test/libgcc/../include
-I/home/seurer/gcc/git/gcc-10-test/libgcc/../libdecnumber/dpd
-I/home/seurer/gcc/git/gcc-10-test/libgcc/../libdecnumber -DHAVE_CC_TLS  -o
_muldi3.o -MT _muldi3.o -MD -MP -MF _muldi3.dep -DL_muldi3 -c
/home/seurer/gcc/git/gcc-10-test/libgcc/libgcc2.c -fvisibility=hidden
-DHIDE_EXPORTS
during GIMPLE pass: store-merging
In file included from /home/seurer/gcc/git/gcc-10-test/libgcc/libgcc2.c:56:
/home/seurer/gcc/git/gcc-10-test/libgcc/libgcc2.c: In function '__muldi3':
/home/seurer/gcc/git/gcc-10-test/libgcc/libgcc2.h:219:20: internal compiler
error: Segmentation fault
  219 | #define __NDW(a,b) __ ## a ## di ## b
      |                    ^~
/home/seurer/gcc/git/gcc-10-test/libgcc/libgcc2.h:273:18: note: in expansion of
macro '__NDW'
  273 | #define __muldi3 __NDW(mul,3)
      |                  ^~~~~
/home/seurer/gcc/git/gcc-10-test/libgcc/libgcc2.c:548:1: note: in expansion of
macro '__muldi3'
  548 | __muldi3 (DWtype u, DWtype v)
      | ^~~~~~~~
0x111d588f crash_signal
        /home/seurer/gcc/git/gcc-10-test/gcc/toplev.c:328
0x125d1930 trim_filename(char const*)
        /home/seurer/gcc/git/gcc-10-test/gcc/diagnostic.c:1223
0x125d4273 fancy_abort(char const*, int, char const*)
        /home/seurer/gcc/git/gcc-10-test/gcc/diagnostic.c:1778
0x10a76dab operand_compare::hash_operand(tree_node const*, inchash::hash&,
unsigned int)
        /home/seurer/gcc/git/gcc-10-test/gcc/fold-const.c:3768
0x10a7766b inchash::add_expr(tree_node const*, inchash::hash&, unsigned int)
        /home/seurer/gcc/git/gcc-10-test/gcc/fold-const.c:3919
0x1122c2af iterative_hash_expr
        /home/seurer/gcc/git/gcc-10-test/gcc/tree.h:5207
0x11232c77 tree_operand_hash::hash(tree_node* const&)
        /home/seurer/gcc/git/gcc-10-test/gcc/tree-hash-traits.h:34
0x1231a2af hash
        /home/seurer/gcc/git/gcc-10-test/gcc/hash-map-traits.h:50
0x1231b97b get
        /home/seurer/gcc/git/gcc-10-test/gcc/hash-map.h:184
0x1232fbaf process_store
        /home/seurer/gcc/git/gcc-10-test/gcc/gimple-ssa-store-merging.c:4883
0x123304a7 execute
        /home/seurer/gcc/git/gcc-10-test/gcc/gimple-ssa-store-merging.c:5040