[Bug c++/108163] New: LTO crosscompilation for arm fails

[Bug c++/108163] New: LTO crosscompilation for arm fails

[david at ixit dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108163

            Bug ID: 108163
           Summary: LTO crosscompilation for arm fails
           Product: gcc
           Version: 10.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: david at ixit dot cz
  Target Milestone: ---

Whole log: https://gitlab.freedesktop.org/okias/mesa/-/jobs/33700498

I'll test with more recent compiler soon, but this one is Debian default,
reporting just for sure.

FAILED: src/util/tests/format/u_format_test 
/usr/lib/ccache/arm-linux-gnueabihf-g++  -o src/util/tests/format/u_format_test
src/util/tests/format/u_format_test.p/u_format_test.c.o -flto -Wl,--as-needed
-Wl,--no-undefined -Wl,--start-group src/util/libmesa_util.a
src/util/format/libmesa_format.a src/util/libmesa_util_sse41.a
src/c11/impl/libmesa_util_c11.a /usr/lib/arm-linux-gnueabihf/libz.so -pthread
-lm -ldl -Wl,--end-group
../src/util/format/u_format_unpack_neon.c: In function
'util_format_b8g8r8a8_unorm_unpack_rgba_8unorm_neon':
../src/util/format/u_format_unpack_neon.c:53:1: error: unable to generate
reloads for:
   53 | }
      | ^
(insn 30 78 34 4 (set (reg:XI 124 [ _19 ])
        (unspec:XI [
                (mem:OI (post_inc:SI (reg/f:SI 147)) [0 MEM[(const
__builtin_neon_qi[64] *)src_67]+0 S32 A8])
                (unspec:V16QI [
                        (const_int 0 [0])
                    ] UNSPEC_VSTRUCTDUMMY)
            ] UNSPEC_VLD4A))
"/usr/lib/gcc-cross/arm-linux-gnueabihf/10/include/arm_neon.h":13069:14 2673
{neon_vld4qav16qi}
     (expr_list:REG_INC (reg/f:SI 147)
        (nil)))
during RTL pass: reload
../src/util/format/u_format_unpack_neon.c:53:1: internal compiler error: in
curr_insn_transform, at lra-constraints.c:4017
0x5927ef _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        ../../src/gcc/rtl-error.c:108
0x892df7 curr_insn_transform
        ../../src/gcc/lra-constraints.c:4017
0x8939b7 lra_constraints(bool)
        ../../src/gcc/lra-constraints.c:5036
0x8820cf lra(_IO_FILE*)
        ../../src/gcc/lra.c:2443
0x840657 do_reload
        ../../src/gcc/ira.c:5527
0x840657 execute
        ../../src/gcc/ira.c:5713
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-10/README.Bugs> for instructions.
lto-wrapper: fatal error: /usr/bin/arm-linux-gnueabihf-g++ returned 1 exit
status
compilation terminated.
mold: fatal: lto-wrapper failed
collect2: error: ld returned 1 exit status

[Bug target/108163] mesa LTO compiling ICEs with unable to generate reloads for neon_vld4qav16qi on arm-linux-gnueabihf

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108163

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2022-12-18

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Definitely needs a testcase really.

[Bug target/108163] mesa LTO compiling ICEs with unable to generate reloads for neon_vld4qav16qi on arm-linux-gnueabihf

[david at ixit dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108163

--- Comment #2 from David Heidelberg (okias) <david at ixit dot cz> ---
I have suspicion it could be some parts of mesa compiled with

-mfpu=neon

while other parts are compiled without this option explicitly stated.

I think the test case could be passing it to different parts of the code which
gets interlinked.