[Bug target/100760] New: [mips + msa] ICE: maximum number of generated reload insns per insn achieved

[Bug target/100760] New: [mips + msa] ICE: maximum number of generated reload insns per insn achieved

[evan@coeus-group.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100760

            Bug ID: 100760
           Summary: [mips + msa] ICE: maximum number of generated reload
                    insns per insn achieved
           Product: gcc
           Version: 10.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: evan@coeus-group.com
  Target Milestone: ---

Created attachment 50869
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50869&action=edit
preprocessed, un-reduced reproducer

I'm getting an ICE when attempting to compile some code on MIPS with MSA which
works on other architectures, and on MIPS without MSA.  Here is a reduced test
case courtesy of C-Reduce:


typedef int a;
void b() { a __attribute__((__vector_size__(8))) c{1, 1}; }


Compile with `mips64el-linux-gnuabi64-g++-10 -march=loongson3a -mmsa -o test
test.c`

I've also attached a pre-processed copy of the original, non-reduced code.  The
original is at
https://github.com/simd-everywhere/simde/blob/7d0e2aca9458f760d7196b94bfdcf83b2178ea24/simde/arm/neon/cmla_rot90.h#L50-L52
(SIMDE_SHUFFLE_VECTOR_ is defined at
https://github.com/simd-everywhere/simde/blob/7d0e2aca9458f760d7196b94bfdcf83b2178ea24/simde/simde-common.h#L278-L281)

This is with 10.2.1-6 from Debian:

/usr/bin/mips64el-linux-gnuabi64-gcc-10 --version
mips64el-linux-gnuabi64-gcc-10 (Debian 10.2.1-6) 10.2.1 20210110
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[Bug target/100760] [mips + msa] ICE: maximum number of generated reload insns per insn achieved

[xry111 at mengyan1223 dot wang]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100760

Xi Ruoyao <xry111 at mengyan1223 dot wang> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |xry111 at mengyan1223 dot wang

--- Comment #1 from Xi Ruoyao <xry111 at mengyan1223 dot wang> ---
Patch proposed: https://gcc.gnu.org/pipermail/gcc-patches/2021-June/573213.html

[Bug target/100760] [mips + msa] ICE: maximum number of generated reload insns per insn achieved

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100760

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Xi Ruoyao <xry111@gcc.gnu.org>:

https://gcc.gnu.org/g:82625a42e652d52fc6bbe6070f8d0589d5e0c8ad

commit r12-2183-g82625a42e652d52fc6bbe6070f8d0589d5e0c8ad
Author: Xi Ruoyao <xry111@mengyan1223.wang>
Date:   Fri Jun 18 20:11:42 2021 +0800

    mips: check MSA support for vector modes [PR100760,PR100761,PR100762]

    Check if the vector mode is really supported by MSA in certain cases,
    instead of testing ISA_HAS_MSA.  Simply testing ISA_HAS_MSA can cause
    ICE when MSA is enabled besides other MIPS SIMD extensions (notably,
    Loongson MMI).

    gcc/

            PR target/100760
            PR target/100761
            PR target/100762
            * config/mips/mips.c (mips_const_insns): Use MSA_SUPPORTED_MODE_P
            instead of ISA_HAS_MSA.
            (mips_expand_vec_unpack): Likewise.
            (mips_expand_vector_init): Likewise.

    gcc/testsuite/

            PR target/100760
            PR target/100761
            PR target/100762
            * gcc.target/mips/pr100760.c: New test.
            * gcc.target/mips/pr100761.c: New test.
            * gcc.target/mips/pr100762.c: New test.

[Bug target/100760] [mips + msa] ICE: maximum number of generated reload insns per insn achieved

[syq at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100760

YunQiang Su <syq at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
                 CC|                            |syq at gcc dot gnu.org
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #3 from YunQiang Su <syq at gcc dot gnu.org> ---
Close it.