[Bug target/81286] New: [6/7 Regression] building for powerpc*-unknown-linux-gnu target fails with RTL checking enabled

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81286

            Bug ID: 81286
           Summary: [6/7 Regression] building for
                    powerpc*-unknown-linux-gnu target fails with RTL
                    checking enabled
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Keywords: ice-checking, ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: powerpc*-unknown-linux-gnu
             Build: x86_64-pc-linux-gnu

Hello,

there is a new regression on the 6-branch and 7-branch. Trying to build an
x86_64-pc-linux-gnu -> powerpc*-unknown-linux-gnu (powerpc-*, powerpc64-*,
powerpc64le-*) crosscompiler with RTL checking enabled fails with:

7-branch r249891:
/repo/gcc-7-branch/libsanitizer/sanitizer_common/sanitizer_coverage_libcdep.cc:
In member function 'void __sanitizer::CoverageData::DumpOffsets()':
/repo/gcc-7-branch/libsanitizer/sanitizer_common/sanitizer_coverage_libcdep.cc:814:6:
internal compiler error: RTL check: expected code 'reg', have 'subreg' in
rhs_regno, at rtl.h:1804
 void CoverageData::DumpOffsets() {
      ^~~~~~~~~~~~
0xd60bd7 rtl_check_failed_code1(rtx_def const*, rtx_code, char const*, int,
char const*)
        /repo/gcc-7-branch/gcc/rtl.c:829
0x5b7e0b rhs_regno
        /repo/gcc-7-branch/gcc/rtl.h:1804
0x12da6bb rhs_regno
        /repo/gcc-7-branch/gcc/config/rs6000/rs6000.md:1660
0x12da6bb gen_addsi3(rtx_def*, rtx_def*, rtx_def*)
        /repo/gcc-7-branch/gcc/config/rs6000/rs6000.md:1657
0xcb7870 expand_binop_directly
        /repo/gcc-7-branch/gcc/optabs.c:1071
0xcb7de5 expand_binop(machine_mode, optab_tag, rtx_def*, rtx_def*, rtx_def*,
int, optab_methods)
        /repo/gcc-7-branch/gcc/optabs.c:1151
0xa69dc9 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
        /repo/gcc-7-branch/gcc/expr.c:9567
0xa53071 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        /repo/gcc-7-branch/gcc/expr.c:11102
0xa6207e expand_expr
        /repo/gcc-7-branch/gcc/expr.h:276
0xa6207e expand_operands(tree_node*, tree_node*, rtx_def*, rtx_def**,
rtx_def**, expand_modifier)
        /repo/gcc-7-branch/gcc/expr.c:7672
0xa6b554 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
        /repo/gcc-7-branch/gcc/expr.c:8792
0xa53071 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        /repo/gcc-7-branch/gcc/expr.c:11102
0xf38132 expand_expr
        /repo/gcc-7-branch/gcc/expr.h:276
0xf38132 computation_cost
        /repo/gcc-7-branch/gcc/tree-ssa-loop-ivopts.c:3627
0xf44551 get_computation_cost_at
        /repo/gcc-7-branch/gcc/tree-ssa-loop-ivopts.c:5052
0xf4bf3e get_computation_cost
        /repo/gcc-7-branch/gcc/tree-ssa-loop-ivopts.c:5072
0xf4bf3e determine_group_iv_cost_generic
        /repo/gcc-7-branch/gcc/tree-ssa-loop-ivopts.c:5095
0xf4bf3e determine_group_iv_cost
        /repo/gcc-7-branch/gcc/tree-ssa-loop-ivopts.c:5670
0xf4dddd determine_group_iv_costs
        /repo/gcc-7-branch/gcc/tree-ssa-loop-ivopts.c:5815
0xf4dddd tree_ssa_iv_optimize_loop
        /repo/gcc-7-branch/gcc/tree-ssa-loop-ivopts.c:7813
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.


6-branch r249890:
/repo/gcc-6-branch/libsanitizer/libbacktrace/../../libbacktrace/dwarf.c: In
function 'read_function_entry':
/repo/gcc-6-branch/libsanitizer/libbacktrace/../../libbacktrace/dwarf.c:2343:23:
internal compiler error: RTL check: expected code 'reg', have 'subreg' in
rhs_regno, at rtl.h:1785
        lhdr->filenames[val.u.uint - 1];
        ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
0xb07477 rtl_check_failed_code1(rtx_def const*, rtx_code, char const*, int,
char const*)
        /repo/gcc-6-branch/gcc/rtl.c:811
0x57d0ca rhs_regno
        /repo/gcc-6-branch/gcc/rtl.h:1785
0xfea5cb rhs_regno
        /repo/gcc-6-branch/gcc/config/rs6000/rs6000.md:1567
0xfea5cb gen_addsi3(rtx_def*, rtx_def*, rtx_def*)
        /repo/gcc-6-branch/gcc/config/rs6000/rs6000.md:1564
0xa64ce0 expand_binop_directly
        /repo/gcc-6-branch/gcc/optabs.c:1070
0xa65245 expand_binop(machine_mode, optab_tag, rtx_def*, rtx_def*, rtx_def*,
int, optab_methods)
        /repo/gcc-6-branch/gcc/optabs.c:1150
mv -f .deps/mmapio.Tpo .deps/mmapio.Plo
0x822edf force_operand(rtx_def*, rtx_def*)
        /repo/gcc-6-branch/gcc/expr.c:7194
0x830bd2 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
        /repo/gcc-6-branch/gcc/expr.c:8649
0x818cce expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        /repo/gcc-6-branch/gcc/expr.c:9595
0x825198 expand_expr
        /repo/gcc-6-branch/gcc/expr.h:260
0x825198 expand_operands(tree_node*, tree_node*, rtx_def*, rtx_def**,
rtx_def**, expand_modifier)
        /repo/gcc-6-branch/gcc/expr.c:7555
0x82d208 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
        /repo/gcc-6-branch/gcc/expr.c:8404
0x818cce expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        /repo/gcc-6-branch/gcc/expr.c:9595
0x816f91 expand_expr
        /repo/gcc-6-branch/gcc/expr.h:260
0x816f91 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        /repo/gcc-6-branch/gcc/expr.c:9981
0x8256bf store_expr_with_bounds(tree_node*, rtx_def*, int, bool, bool,
tree_node*)
        /repo/gcc-6-branch/gcc/expr.c:5407
0x8270e0 expand_assignment(tree_node*, tree_node*, bool)
        /repo/gcc-6-branch/gcc/expr.c:5176
0x6fb6d0 expand_gimple_stmt_1
        /repo/gcc-6-branch/gcc/cfgexpand.c:3618
/bin/sh ../libtool  --tag=CC   --mode=compile
/repo/build-6-branch-249890-checking-yes-rtl-df-nographite-powerpc/./gcc/xgcc
-B/repo/build-6-branch-249890-checking-yes-rtl-df-nographite-powerpc/./gcc/
-B/repo/gcc-6-branch//binary-6-branch-249890-checking-yes-rtl-df-nographite-powerpc/powerpc-unknown-linux-gnu/bin/
-B/repo/gcc-6-branch//binary-6-branch-249890-checking-yes-rtl-df-nographite-powerpc/powerpc-unknown-linux-gnu/lib/
-isystem
/repo/gcc-6-branch//binary-6-branch-249890-checking-yes-rtl-df-nographite-powerpc/powerpc-unknown-linux-gnu/include
-isystem
/repo/gcc-6-branch//binary-6-branch-249890-checking-yes-rtl-df-nographite-powerpc/powerpc-unknown-linux-gnu/sys-include
   -DHAVE_CONFIG_H -I. -I/repo/gcc-6-branch/libsanitizer/libbacktrace -I..  -I
/repo/gcc-6-branch/libsanitizer/../include -I
/repo/gcc-6-branch/libsanitizer/../libgcc -I ../../libgcc -I .. -I
/repo/gcc-6-branch/libsanitizer -I
/repo/gcc-6-branch/libsanitizer/../libbacktrace  -W -Wall -Wwrite-strings
-Wmissing-format-attribute -Wcast-qual -Werror -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition -g -O2 -MT mmap.lo -MD -MP -MF
.deps/mmap.Tpo -c -o mmap.lo `test -f '../../libbacktrace/mmap.c' || echo
'/repo/gcc-6-branch/libsanitizer/libbacktrace/'`../../libbacktrace/mmap.c
0x6fb6d0 expand_gimple_stmt
        /repo/gcc-6-branch/gcc/cfgexpand.c:3714
0x6fdbfe expand_gimple_basic_block
        /repo/gcc-6-branch/gcc/cfgexpand.c:5720
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.


Last known working version was:
7-branch r249261
6-branch r249257

The compiler is configured as:
$ powerpc-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-7-branch/binary-latest-powerpc/bin/powerpc-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-7-branch/binary-7-branch-249261-checking-yes-rtl-df-extra-nographite-powerpc/bin/../libexec/gcc/powerpc-unknown-linux-gnu/7.1.1/lto-wrapper
Target: powerpc-unknown-linux-gnu
Configured with: /repo/gcc-7-branch//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--without-cloog --without-ppl --without-isl
--with-sysroot=/usr/powerpc-unknown-linux-gnu --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=powerpc-unknown-linux-gnu
--with-ld=/usr/bin/powerpc-unknown-linux-gnu-ld
--with-as=/usr/bin/powerpc-unknown-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-7-branch//binary-7-branch-249261-checking-yes-rtl-df-extra-nographite-powerpc
Thread model: posix
gcc version 7.1.1 20170616 (GCC)