[Bug middle-end/70895] OpenACC: loop reduction does not work. Output is zero.

[cltang at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70895

--- Comment #7 from Chung-Lin Tang <cltang at gcc dot gnu.org> ---
Author: cltang
Date: Thu Aug 18 14:56:11 2016
New Revision: 239577

URL: https://gcc.gnu.org/viewcvs?rev=239577&root=gcc&view=rev
Log:
Backport from mainline:

2016-08-18  Chung-Lin Tang  <clt...@codesourcery.com>

        PR middle-end/70895
        gcc/
        * gimplify.c (omp_add_variable): Adjust/add variable mapping on
        enclosing parallel construct for reduction variables on OpenACC loop
        directives.

        gcc/testsuite/
        * gfortran.dg/goacc/loop-tree-1.f90: Add gimple scan-tree-dump test.
        * c-c++-common/goacc/reduction-1.c: Likewise.
        * c-c++-common/goacc/reduction-2.c: Likewise.
        * c-c++-common/goacc/reduction-3.c: Likewise.
        * c-c++-common/goacc/reduction-4.c: Likewise.

        libgomp/
        * testsuite/libgomp.oacc-fortran/reduction-7.f90: Add explicit
        firstprivate clauses.
        * testsuite/libgomp.oacc-fortran/reduction-6.f90: Remove explicit
        copy clauses.
        * testsuite/libgomp.oacc-c-c++-common/reduction-7.c: Likewise.
        * testsuite/libgomp.oacc-c-c++-common/reduction-cplx-flt.c: Likewise.
        * testsuite/libgomp.oacc-c-c++-common/reduction-flt.c: Likewise.
        * testsuite/libgomp.oacc-c-c++-common/collapse-2.c: Likewise.
        * testsuite/libgomp.oacc-c-c++-common/loop-red-wv-1.c: Likewise.
        * testsuite/libgomp.oacc-c-c++-common/collapse-4.c: Likewise.
        * testsuite/libgomp.oacc-c-c++-common/loop-red-v-1.c: Likewise.
        * testsuite/libgomp.oacc-c-c++-common/reduction-cplx-dbl.c: Likewise.
        * testsuite/libgomp.oacc-c-c++-common/loop-red-g-1.c: Likewise.
        * testsuite/libgomp.oacc-c-c++-common/loop-red-gwv-1.c: Likewise.
        * testsuite/libgomp.oacc-c-c++-common/loop-red-w-1.c: Likewise.
        * testsuite/libgomp.oacc-c-c++-common/reduction-dbl.c: Likewise.


Modified:
    branches/gcc-6-branch/gcc/ChangeLog
    branches/gcc-6-branch/gcc/gimplify.c
    branches/gcc-6-branch/gcc/testsuite/ChangeLog
    branches/gcc-6-branch/gcc/testsuite/c-c++-common/goacc/reduction-1.c
    branches/gcc-6-branch/gcc/testsuite/c-c++-common/goacc/reduction-2.c
    branches/gcc-6-branch/gcc/testsuite/c-c++-common/goacc/reduction-3.c
    branches/gcc-6-branch/gcc/testsuite/c-c++-common/goacc/reduction-4.c
    branches/gcc-6-branch/gcc/testsuite/gfortran.dg/goacc/loop-tree-1.f90
    branches/gcc-6-branch/libgomp/ChangeLog
   
branches/gcc-6-branch/libgomp/testsuite/libgomp.oacc-c-c++-common/collapse-2.c
   
branches/gcc-6-branch/libgomp/testsuite/libgomp.oacc-c-c++-common/collapse-4.c
   
branches/gcc-6-branch/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-red-g-1.c
   
branches/gcc-6-branch/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-red-gwv-1.c
   
branches/gcc-6-branch/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-red-v-1.c
   
branches/gcc-6-branch/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-red-w-1.c
   
branches/gcc-6-branch/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-red-wv-1.c
   
branches/gcc-6-branch/libgomp/testsuite/libgomp.oacc-c-c++-common/reduction-7.c
   
branches/gcc-6-branch/libgomp/testsuite/libgomp.oacc-c-c++-common/reduction-cplx-dbl.c
   
branches/gcc-6-branch/libgomp/testsuite/libgomp.oacc-c-c++-common/reduction-cplx-flt.c
   
branches/gcc-6-branch/libgomp/testsuite/libgomp.oacc-c-c++-common/reduction-dbl.c
   
branches/gcc-6-branch/libgomp/testsuite/libgomp.oacc-c-c++-common/reduction-flt.c
   
branches/gcc-6-branch/libgomp/testsuite/libgomp.oacc-fortran/reduction-6.f90
   
branches/gcc-6-branch/libgomp/testsuite/libgomp.oacc-fortran/reduction-7.f90