From: Tom de Vries <Tom_deVries@mentor.com>
To: Richard Biener <rguenther@suse.de>
Cc: Richard Biener <richard.guenther@gmail.com>,
"gcc-patches@gnu.org" <gcc-patches@gnu.org>,
Jakub Jelinek <jakub@redhat.com>
Subject: [PATCH, PR68373 ] Call scev_const_prop in pass_parallelize_loops::execute
Date: Tue, 17 Nov 2015 22:21:00 -0000 [thread overview]
Message-ID: <564BA844.1010103@mentor.com> (raw)
In-Reply-To: <564B49F6.308@mentor.com>
[-- Attachment #1: Type: text/plain, Size: 1562 bytes --]
[ was: Re: [PATCH, 10/16] Add pass_oacc_kernels pass group in passes.def ]
Hi,
Consider test-case test.c, with a use of the final value of the
iteration variable (return i):
...
unsigned int
foo (int *a, unsigned int n)
{
unsigned int i;
for (i = 0; i < n; ++i)
a[i] = 1;
return i;
}
...
Compiled with:
...
$ gcc -S -O2 test.c -ftree-parallelize-loops=2 -fdump-tree-all-details
...
Before parloops, we have:
...
<bb 4>:
# i_12 = PHI <0(3), i_10(5)>
_5 = (long unsigned int) i_12;
_6 = _5 * 4;
_8 = a_7(D) + _6;
*_8 = 1;
i_10 = i_12 + 1;
if (n_4(D) > i_10)
goto <bb 5>;
else
goto <bb 6>;
<bb 5>:
goto <bb 4>;
<bb 6>:
# i_14 = PHI <n_4(D)(4), 0(2)>
...
Parloops will fail because:
...
phi is n_2 = PHI <n_4(D)(4)>
arg of phi to exit: value n_4(D) used outside loop
checking if it a part of reduction pattern:
FAILED: it is not a part of reduction....
...
[ note that the phi looks slightly different. In
gather_scalar_reductions -> vect_analyze_loop_form ->
vect_analyze_loop_form_1 -> split_loop_exit_edge we split the edge from
bb4 to bb6. ]
This patch uses scev_const_prop at the start of parloops.
scev_const_prop first also splits the exit edge, and then replaces the
phi with a assignment:
...
final value replacement:
n_2 = PHI <n_4(D)(4)>
with
n_2 = n_4(D);
...
This allows parloops to succeed.
And there's a similar story when we compile with -fno-tree-scev-cprop in
addition.
Bootstrapped and reg-tested on x86_64.
OK for stage3/stage1?
Thanks,
- Tom
[-- Attachment #2: 0005-Call-scev_const_prop-in-pass_parallelize_loops-execute.patch --]
[-- Type: text/x-patch, Size: 1372 bytes --]
Call scev_const_prop in pass_parallelize_loops::execute
2015-11-17 Tom de Vries <tom@codesourcery.com>
PR tree-optimization/68373
* tree-parloops.c (pass_parallelize_loops::execute): Call
scev_const_prop.
* gcc.dg/autopar/pr68373.c: New test.
---
gcc/testsuite/gcc.dg/autopar/pr68373.c | 14 ++++++++++++++
gcc/tree-parloops.c | 3 +++
2 files changed, 17 insertions(+)
diff --git a/gcc/testsuite/gcc.dg/autopar/pr68373.c b/gcc/testsuite/gcc.dg/autopar/pr68373.c
new file mode 100644
index 0000000..8e0f8a5
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/autopar/pr68373.c
@@ -0,0 +1,14 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-parallelize-loops=2 -fdump-tree-parloops-details" } */
+
+unsigned int
+foo (int *a, unsigned int n)
+{
+ unsigned int i;
+ for (i = 0; i < n; ++i)
+ a[i] = 1;
+
+ return i;
+}
+
+/* { dg-final { scan-tree-dump-times "SUCCESS: may be parallelized" 1 "parloops" } } */
diff --git a/gcc/tree-parloops.c b/gcc/tree-parloops.c
index 17415a8..d944395 100644
--- a/gcc/tree-parloops.c
+++ b/gcc/tree-parloops.c
@@ -2787,6 +2787,9 @@ pass_parallelize_loops::execute (function *fun)
if (number_of_loops (fun) <= 1)
return 0;
+ unsigned int sccp_todo = scev_const_prop ();
+ gcc_assert (sccp_todo == 0);
+
if (parallelize_loops ())
{
fun->curr_properties &= ~(PROP_gimple_eomp);
next prev parent reply other threads:[~2015-11-17 22:21 UTC|newest]
Thread overview: 133+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-09 15:35 [PATCH series, 16] Use parloops to parallelize oacc kernels regions Tom de Vries
2015-11-09 15:44 ` [PATCH, 1/16] Insert new exit block only when needed in transform_to_exit_first_loop_alt Tom de Vries
2015-11-11 10:50 ` Richard Biener
2015-11-09 15:45 ` [PATCH, 2/16] Make create_parallel_loop return void Tom de Vries
2015-11-11 10:50 ` Richard Biener
2015-11-09 15:51 ` [PATCH, 3/16] Ignore reduction clause on kernels directive Tom de Vries
2015-11-24 12:25 ` [PING][PATCH, " Tom de Vries
2016-01-18 14:24 ` [PING^2][PATCH, " Tom de Vries
2016-01-18 14:26 ` Jakub Jelinek
2015-11-09 16:10 ` [PATCH, 4/16] Implement -foffload-alias Tom de Vries
2015-11-11 10:53 ` Richard Biener
2015-11-11 11:01 ` Jakub Jelinek
2015-11-12 16:04 ` Tom de Vries
2015-11-13 8:46 ` Richard Biener
2015-11-13 11:03 ` Tom de Vries
2015-11-13 11:30 ` Richard Biener
2015-11-13 11:39 ` Jakub Jelinek
2015-11-21 12:24 ` Tom de Vries
2015-11-23 11:46 ` Richard Biener
2015-11-27 11:44 ` Tom de Vries
2015-11-27 12:14 ` Tom de Vries
2015-12-02 9:59 ` Jakub Jelinek
2016-03-14 13:16 ` Tom de Vries
2016-03-14 23:18 ` Tom de Vries
2015-12-02 9:46 ` Jakub Jelinek
2015-12-02 13:11 ` Tom de Vries
2015-12-11 12:45 ` Tom de Vries
2015-12-11 13:00 ` Richard Biener
2015-12-13 16:38 ` Tom de Vries
2015-12-14 13:26 ` Richard Biener
2015-12-14 15:44 ` Tom de Vries
2015-12-16 13:16 ` Richard Biener
2015-12-16 14:43 ` Tom de Vries
2015-12-17 12:03 ` [gomp4] " Thomas Schwinge
2015-12-03 11:53 ` Tom de Vries
2015-11-09 16:31 ` [PATCH, 5/16] Add in_oacc_kernels_region in struct loop Tom de Vries
2015-11-11 10:57 ` Richard Biener
2015-11-16 11:39 ` Tom de Vries
2015-11-16 12:41 ` Richard Biener
2015-11-16 11:39 ` Tom de Vries
2015-11-09 17:39 ` [PATCH, 6/16] Add pass_oacc_kernels Tom de Vries
2015-11-11 10:59 ` Richard Biener
2015-11-19 13:51 ` Tom de Vries
2015-11-24 12:17 ` Tom de Vries
2015-11-25 10:42 ` Richard Biener
2016-02-05 12:06 ` Use plain -fopenacc to enable OpenACC kernels processing (was: [PATCH, 6/16] Add pass_oacc_kernels) Thomas Schwinge
2016-02-10 14:40 ` Use plain -fopenacc to enable OpenACC kernels processing Thomas Schwinge
2016-02-15 16:54 ` Tom de Vries
2016-02-23 15:19 ` Thomas Schwinge
2015-11-09 18:14 ` [PATCH, 7/16] Add pass_dominator_oacc_kernels Tom de Vries
2015-11-11 11:05 ` Richard Biener
2015-11-16 12:04 ` Tom de Vries
2015-11-09 18:34 ` [PATCH, 8/16] Add pass_ch_oacc_kernels Tom de Vries
2015-11-11 20:29 ` Tom de Vries
2015-11-30 12:12 ` [gomp4] Use pass_ch instead of pass_ch_oacc_kernels (was: [PATCH, 8/16] Add pass_ch_oacc_kernels) Thomas Schwinge
2015-11-09 19:53 ` [PATCH, 9/16] Add pass_parallelize_loops_oacc_kernels Tom de Vries
2015-11-16 11:59 ` Tom de Vries
2015-11-24 12:27 ` Tom de Vries
2015-12-13 16:58 ` [PIING][PATCH, " Tom de Vries
2015-12-14 15:23 ` Richard Biener
2016-01-16 22:41 ` [Committed] Move pass_expand_omp_ssa out of pass_parallelize_loops Tom de Vries
2016-01-18 12:59 ` [Committed] Allow pass_parallelize_loops to be run outside the loop pipeline Tom de Vries
2016-01-18 13:07 ` [committed] Add oacc_kernels_p argument to pass_parallelize_loops Tom de Vries
2016-01-18 13:30 ` [committed] Add pass_parallelize_loops to pass_oacc_kernels Tom de Vries
2016-01-20 8:54 ` [committed] Add oacc_kernels_p argument to pass_parallelize_loops Thomas Schwinge
2016-01-20 10:31 ` Tom de Vries
2015-11-09 19:59 ` [PATCH, 10/16] Add pass_oacc_kernels pass group in passes.def Tom de Vries
2015-11-11 11:03 ` Richard Biener
2015-11-16 11:55 ` Tom de Vries
2015-11-16 12:45 ` Richard Biener
2015-11-16 23:21 ` Tom de Vries
2015-11-17 10:05 ` Richard Biener
2015-11-17 14:54 ` Tom de Vries
2015-11-17 15:18 ` Richard Biener
2015-11-17 15:39 ` Tom de Vries
2015-11-17 22:21 ` Tom de Vries [this message]
2015-11-19 9:36 ` [PATCH, PR68373 ] Call scev_const_prop in pass_parallelize_loops::execute Tom de Vries
2015-11-20 10:15 ` Richard Biener
2015-11-18 8:30 ` [PATCH, 10/16] Add pass_oacc_kernels pass group in passes.def Richard Biener
2015-11-18 16:22 ` Bernhard Reutner-Fischer
2015-11-20 12:53 ` [committed, trivial] Fix typo and trailing whitespace in dump-file strings in parloops Tom de Vries
2015-11-19 0:35 ` [PATCH, 10/16] Add pass_oacc_kernels pass group in passes.def Tom de Vries
2015-11-20 10:28 ` Richard Biener
2015-11-21 8:42 ` Tom de Vries
2015-11-23 11:31 ` Richard Biener
2015-11-23 15:53 ` Tom de Vries
2015-11-23 16:38 ` Richard Biener
2015-11-19 10:31 ` Tom de Vries
2015-11-20 10:37 ` Richard Biener
2015-11-20 13:27 ` Tom de Vries
2015-11-20 13:29 ` Richard Biener
2015-11-20 16:34 ` Tom de Vries
2015-11-23 10:11 ` Richard Biener
2015-11-24 12:22 ` Tom de Vries
2015-11-24 13:19 ` Richard Biener
2015-11-24 14:33 ` Tom de Vries
2015-11-24 14:36 ` Richard Biener
2015-11-24 15:05 ` Tom de Vries
2015-11-25 10:43 ` Richard Biener
2015-11-25 10:44 ` Richard Biener
2015-11-30 17:48 ` [gomp4] " Thomas Schwinge
2015-11-22 23:37 ` [PATCH] Don't reapply loops flags if unnecessary in loop_optimizer_init Tom de Vries
2015-11-23 10:33 ` Richard Biener
2015-11-23 11:27 ` Tom de Vries
2015-11-09 20:02 ` [PATCH, 11/16] Update testcases after adding kernels pass group Tom de Vries
2015-11-11 11:03 ` Richard Biener
2015-11-12 14:32 ` Tom de Vries
2015-11-12 14:43 ` Richard Biener
2015-11-12 15:42 ` David Malcolm
2015-11-13 9:44 ` Richard Biener
2015-11-09 20:06 ` [PATCH, 12/16] Handle acc loop directive Tom de Vries
2015-11-24 12:30 ` [PING][PATCH, " Tom de Vries
2016-01-18 14:27 ` [PING^2][PATCH, " Tom de Vries
2016-01-26 12:38 ` [PING^3][PATCH, " Tom de Vries
2016-01-26 12:50 ` Jakub Jelinek
2016-02-12 11:11 ` Tom de Vries
2016-02-22 10:55 ` Tom de Vries
2016-02-22 10:58 ` Jakub Jelinek
2016-02-29 3:27 ` Tom de Vries
2016-03-07 8:22 ` [PING][PATCH, " Tom de Vries
2016-03-14 6:21 ` [PING^2][PATCH, " Tom de Vries
2015-11-09 20:08 ` [PATCH, 13/16] Add c-c++-common/goacc/kernels-*.c Tom de Vries
2016-01-18 13:33 ` [committed] Add oacc kernels tests in goacc Tom de Vries
2015-11-09 20:09 ` [PATCH, 14/16] Add gfortran.dg/goacc/kernels-*.f95 Tom de Vries
2015-11-09 20:11 ` [PATCH, 15/16] Add libgomp.oacc-c-c++-common/kernels-*.c Tom de Vries
2016-01-18 13:39 ` [comitted] Add oacc kernels test in libgomp Tom de Vries
2016-03-09 9:18 ` [PATCH, 15/16] Add libgomp.oacc-c-c++-common/kernels-*.c Tom de Vries
2016-03-18 12:46 ` Scan for parallelization of the oacc kernels test-cases in gfortran.dg/goacc (was: [PATCH, 15/16] Add libgomp.oacc-c-c++-common/kernels-*.c) Thomas Schwinge
2016-04-05 9:13 ` Scan for parallelization of the oacc kernels test-cases in gfortran.dg/goacc Tom de Vries
2016-04-07 15:26 ` Thomas Schwinge
2015-11-09 20:12 ` [PATCH, 16/16] Add libgomp.oacc-fortran/kernels-*.f95 Tom de Vries
2016-03-09 9:19 ` Tom de Vries
2016-03-16 13:12 ` Thomas Schwinge
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