[gcc r12-8311] Fix up 'libgomp.oacc-fortran/print-1.f90' GCN offloading compilation [PR104717]

[gcc r12-8311] Fix up 'libgomp.oacc-fortran/print-1.f90' GCN offloading compilation [PR104717]

[Thomas Schwinge]

https://gcc.gnu.org/g:2a570f11a2fecf23998d7fe1d5cabad62cfe5cec

commit r12-8311-g2a570f11a2fecf23998d7fe1d5cabad62cfe5cec
Author: Thomas Schwinge <thomas@codesourcery.com>
Date:   Tue Apr 26 18:41:23 2022 +0200

    Fix up 'libgomp.oacc-fortran/print-1.f90' GCN offloading compilation [PR104717]
    
    That got broken by recent commit b2202431910e30d8505c94d1cb9341cac7080d10
    "fortran: Fix up gfc_trans_oacc_construct [PR104717]".
    
            PR fortran/104717
            libgomp/
            * testsuite/libgomp.oacc-fortran/print-1.f90: Add OpenACC
            privatization scanning.  For GCN offloading compilation, raise
            '-mgang-private-size'.

Diff:
---
 libgomp/testsuite/libgomp.oacc-fortran/print-1.f90 | 30 +++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/libgomp/testsuite/libgomp.oacc-fortran/print-1.f90 b/libgomp/testsuite/libgomp.oacc-fortran/print-1.f90
index 7b7f73741fe..42a8538e1fb 100644
--- a/libgomp/testsuite/libgomp.oacc-fortran/print-1.f90
+++ b/libgomp/testsuite/libgomp.oacc-fortran/print-1.f90
@@ -6,11 +6,39 @@
 ! Separate file 'print-1-nvptx.f90' for nvptx offloading.
 ! { dg-skip-if "separate file" { offload_target_nvptx } }
 
+! For GCN offloading compilation, when gang-privatizing 'dt_parm.N'
+! (see below), we run into an 'gang-private data-share memory exhausted'
+! error: the default '-mgang-private-size' is too small.  Per
+! 'gcc/fortran/trans-io.cc'/'libgfortran/io/io.h', that one is
+! 'struct st_parameter_dt', which indeed is rather big.  Instead of
+! working out its exact size (which may vary per GCC configuration),
+! raise '-mgang-private-size' to an arbitrary high value.
+! { dg-additional-options "-foffload-options=amdgcn-amdhsa=-mgang-private-size=13579" { target openacc_radeon_accel_selected } }
+
+! { dg-additional-options "-fopt-info-note-omp" }
+! { dg-additional-options "-foffload=-fopt-info-note-omp" }
+
+! { dg-additional-options "--param=openacc-privatization=noisy" }
+! { dg-additional-options "-foffload=--param=openacc-privatization=noisy" }
+! Prune a few: uninteresting, and potentially varying depending on GCC configuration (data types):
+! { dg-prune-output {note: variable 'D\.[0-9]+' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} } */
+
+! It's only with Tcl 8.5 (released in 2007) that "the variable 'varName'
+! passed to 'incr' may be unset, and in that case, it will be set to [...]",
+! so to maintain compatibility with earlier Tcl releases, we manually
+! initialize counter variables:
+! { dg-line l_dummy[variable c_compute 0] }
+! { dg-message dummy {} { target iN-VAl-Id } l_dummy } to avoid
+! "WARNING: dg-line var l_dummy defined, but not used".
+
 program main
   implicit none
   integer :: var = 42
 
-!$acc parallel
+!$acc parallel ! { dg-line l_compute[incr c_compute] }
+  ! { dg-note {variable 'dt_parm\.[0-9]+' declared in block is candidate for adjusting OpenACC privatization level} {} { target *-*-* } l_compute$c_compute }
+  !   { dg-note {variable 'dt_parm\.[0-9]+' ought to be adjusted for OpenACC privatization level: 'gang'} {} { target *-*-* } l_compute$c_compute }
+  !   { dg-note {variable 'dt_parm\.[0-9]+' adjusted for OpenACC privatization level: 'gang'} {} { target { ! openacc_host_selected } } l_compute$c_compute }
   write (0, '("The answer is ", I2)') var
 !$acc end parallel