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List:       gcc-bugs
Subject:    [Bug target/90928] [9/10/11 Regression] [nvptx] internal compiler error: in instantiate_virtual_regs
From:       "cvs-commit at gcc dot gnu.org" <gcc-bugzilla () gcc ! gnu ! org>
Date:       2020-07-31 17:13:48
Message-ID: bug-90928-4-D0am8d6Tjt () http ! gcc ! gnu ! org/bugzilla/
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D90928

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom de Vries <vries@gcc.gnu.org>:

https://gcc.gnu.org/g:3a4a92598014d33ef2c8b8ec38d8ad917812921a

commit r11-2464-g3a4a92598014d33ef2c8b8ec38d8ad917812921a
Author: Roger Sayle <roger@nextmovesoftware.com>
Date:   Thu Jul 30 11:42:06 2020 +0200

    nvptx: Define TARGET_TRULY_NOOP_TRUNCATION to false

    Many thanks to Richard Biener for approving the midde-end
    patch that cleared the way for this one.  This nvptx patch
    defines the target hook TARGET_TRULY_NOOP_TRUNCATION to
    false, indicating that integer truncations require explicit
    instructions.  nvptx.c already defines TARGET_MODES_TIEABLE_P
    and TARGET_CAN_CHANGE_MODE_CLASS to false, and as (previously)
    documented that may require TARGET_TRULY_NOOP_TRUNCATION to
    be defined likewise.

    This patch decreases the number of unexpected failures in
    the testsuite by 10, and increases the number of expected
    passes by 4, including these previous FAILs/ICEs:
    gcc.c-torture/compile/opout.c
    gcc.dg/torture/pr79125.c
    gcc.dg/tree-ssa/pr92085-1.c

    Unfortunately there is one testsuite failure that used to
    pass gcc.target/nvptx/v2si-cvt.c, but this isn't an ICE or
    incorrect code.  This regression has been filed as PR96403,
    and the failing scan-assembler directives have been replaced
    by a reference to the PR.

    This patch has been tested on nvptx-none hosted on
    x86_64-pc-linux-gnu with "make" and "make check" with
    fewer ICEs and no wrong code regressions.

    2020-07-31  Roger Sayle  <roger@nextmovesoftware.com>
                Tom de Vries  <tdevries@suse.de>

    gcc/ChangeLog:

            PR target/90928
            * config/nvptx/nvptx.c (nvptx_truly_noop_truncation): Implement.
            (TARGET_TRULY_NOOP_TRUNCATION): Define.

    gcc/testsuite/ChangeLog:

            * gcc.target/nvptx/v2si-cvt.c: Simplify source.  Remove
            scan-assembler directives.  Mention PR96403.=
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