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From: "tschwinge at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/112937] [14 Regression] GCN: FAILs due to unconditional
 'f->use_flat_addressing = true;'
Date: Mon, 11 Dec 2023 15:36:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112937

--- Comment #1 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
The unconditional GCN 'f->use_flat_addressing =3D true;' also has an effect=
 on
one (only!) libgomp offloading test case, for
'-foffload-options=3Damdgcn-amdhsa=3D-march=3Dgfx90a' (only!):

    @@ -6188,11 +6188,11 @@ PASS: libgomp.fortran/target1.f90   -O1  execut=
ion
test
    PASS: libgomp.fortran/target1.f90   -O2  (test for excess errors)
    PASS: libgomp.fortran/target1.f90   -O2  execution test
    PASS: libgomp.fortran/target1.f90   -O3 -fomit-frame-pointer -funroll-l=
oops
-fpeel-loops -ftracer -finline-functions  (test for excess errors)
    {+WARNING: program timed out.+}
    [-PASS:-]{+FAIL:+} libgomp.fortran/target1.f90   -O3 -fomit-frame-point=
er
-funroll-loops -fpeel-loops -ftracer -finline-functions  execution test
    PASS: libgomp.fortran/target1.f90   -O3 -g  (test for excess errors)
    {+WARNING: program timed out.+}
    [-PASS:-]{+FAIL:+} libgomp.fortran/target1.f90   -O3 -g  execution test
    PASS: libgomp.fortran/target1.f90   -Os  (test for excess errors)
    PASS: libgomp.fortran/target1.f90   -Os  execution test

    libgomp: GCN fatal error: Asynchronous queue error
    Runtime message: HSA_STATUS_ERROR_INVALID_ISA: The instruction set
architecture is invalid.
    [hangs]

Huh!?  That looks very odd (to me, at least).

Manually trying with simply '-O3', that appears to be 100 % reproducible on=
 our
gfx90a systems -- but nowhere else.  ..., and disappears with the unconditi=
onal
GCN 'f->use_flat_addressing =3D true;' reverted.  (..., which of course wou=
ld
regress other new test cases.)=