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Subject: [Bug libfortran/97063] [ MATMUL intrinsic] The value of result is
 wrong when vector (step size is negative) * matrix
Date: Mon, 19 Oct 2020 21:07:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97063

--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Harald Anlauf
<anlauf@gcc.gnu.org>:

https://gcc.gnu.org/g:53325dec8e01775af3eb9231d10f2afa1b8d5559

commit r10-8912-g53325dec8e01775af3eb9231d10f2afa1b8d5559
Author: Harald Anlauf <anlauf@gmx.de>
Date:   Sun Oct 18 20:15:26 2020 +0200

    PR libfortran/97063 - Wrong result for vector (step size is negative) *
matrix

    The MATMUL intrinsic provided a wrong result for rank-1 times rank-2 ar=
ray
    when a negative stride was used for addressing the elements of the rank=
-1
    array, because a check on strides was erroneously placed before the che=
ck
    on the rank.  Interchange order of checks.

    libgfortran/ChangeLog:

            * m4/matmul_internal.m4: Move check for rank-1 times rank-2 bef=
ore
            checks on strides for rank-2 times rank-2.
            * generated/matmul_c10.c: Regenerated.
            * generated/matmul_c16.c: Likewise.
            * generated/matmul_c4.c: Likewise.
            * generated/matmul_c8.c: Likewise.
            * generated/matmul_i1.c: Likewise.
            * generated/matmul_i16.c: Likewise.
            * generated/matmul_i2.c: Likewise.
            * generated/matmul_i4.c: Likewise.
            * generated/matmul_i8.c: Likewise.
            * generated/matmul_r10.c: Likewise.
            * generated/matmul_r16.c: Likewise.
            * generated/matmul_r4.c: Likewise.
            * generated/matmul_r8.c: Likewise.
            * generated/matmulavx128_c10.c: Likewise.
            * generated/matmulavx128_c16.c: Likewise.
            * generated/matmulavx128_c4.c: Likewise.
            * generated/matmulavx128_c8.c: Likewise.
            * generated/matmulavx128_i1.c: Likewise.
            * generated/matmulavx128_i16.c: Likewise.
            * generated/matmulavx128_i2.c: Likewise.
            * generated/matmulavx128_i4.c: Likewise.
            * generated/matmulavx128_i8.c: Likewise.
            * generated/matmulavx128_r10.c: Likewise.
            * generated/matmulavx128_r16.c: Likewise.
            * generated/matmulavx128_r4.c: Likewise.
            * generated/matmulavx128_r8.c: Likewise.

    gcc/testsuite/ChangeLog:

            * gfortran.dg/matmul_20.f90: New test.

    (cherry picked from commit cd6cd6aed195b4ec7d652e8b41d60b60e174304e)=