Hi!
On 2024-10-14T10:23:56+0200, I wrote:
> On 2024-10-13T10:21:01+0200, Tobias Burnus <[email protected]> wrote:
>> Now pushed as r15-4298-g3269a722b7a036.
>>>>> * (new) For OpenACC, use a builtin for acc_on_device + actually do
>>>>> compile-time optimization when offloading is not configured.
>
> No. 2. This resolved
> PR82250 "Fortran OpenACC acc_on_device early folding", right?
> (..., which you recently had duplicated as
> PR116269 "[OpenACC] acc_on_device – compile-time optimization fails",
> right?)
>
> Please:
>
> git mv gfortran.dg/goacc/acc_on_device-2{-off,_-fno-openacc}.f95
>
> ..., and add a 's%-fno-openacc%-fno-builtin-acc_on_device' variant.
>
> Hmm, why can't 'gfortran.dg/goacc/acc_on_device-2.f95' be un-XFAILed?
>>>>> PS: The testsuite/libgomp.oacc-c-c++-common/routine-nohost-1.c
>>>>> example is not completely clear to me; however, the new optimization
>>>>> causes that without offloading enabled, the dump message is not
>>>>> shown. I tried to understand it better with
>>>>> -fno-builtin-acc_on_device, but that then caused link errors as the
>>>>> device function wasn't optimizated away, leaving me puzzled. — At
>>>>> the end, I just changed the dg-* and did not try to understand the
>>>>> issue.
>
> Why then not wait for someone else to help look into that? :-)
> On 2024-10-10T10:31:13+0200, Tobias Burnus <[email protected]> wrote:
>> Fortran: Use OpenACC's acc_on_device builtin, fix OpenMP'
>> __builtin_is_initial_device
>> Extend the code to also use the builtin acc_on_device with OpenACC,
>> which was previously only used in C/C++. Additionally, fix folding
>> when offloading is not enabled.
I don't understand the latter part: what needs to be fixed?
>> gcc/ChangeLog:
>>
>> * gimple-fold.cc (gimple_fold_builtin_acc_on_device): Also fold
>> when offloading is not configured.
We already did fold, didn't we?
>> --- a/gcc/gimple-fold.cc
>> +++ b/gcc/gimple-fold.cc
>> @@ -4190,7 +4190,7 @@ static bool
>> gimple_fold_builtin_acc_on_device (gimple_stmt_iterator *gsi, tree arg0)
>> {
>> /* Defer folding until we know which compiler we're in. */
>> - if (symtab->state != EXPANSION)
>> + if (ENABLE_OFFLOADING && symtab->state != EXPANSION)
>> return false;
>>
>> unsigned val_host = GOMP_DEVICE_HOST;
That is, I don't understand the rationale for diverging GCC's (default)
'--disable-offload-targets' vs. '--enable-offload-targets=[...]'
configurations here?
>> --- a/libgomp/testsuite/libgomp.oacc-c-c++-common/routine-nohost-1.c
>> +++ b/libgomp/testsuite/libgomp.oacc-c-c++-common/routine-nohost-1.c
>> @@ -36,8 +36,7 @@ static int fact_nohost(int n)
>>
>> return fact(n);
>> }
>> -/* { dg-final { scan-tree-dump-times {(?n)^OpenACC routine 'fact_nohost'
>> has 'nohost' clause\.$} 1 oaccloops { target c } } }
>> - { dg-final { scan-tree-dump-times {(?n)^OpenACC routine 'int
>> fact_nohost\(int\)' has 'nohost' clause\.$} 1 oaccloops { target { c++ && {
>> ! offloading_enabled } } } } }
>> +/* { dg-final { scan-tree-dump-times {(?n)^OpenACC routine 'fact_nohost'
>> has 'nohost' clause\.$} 1 oaccloops { target { c && offloading_enabled } } }
>> }
>> { dg-final { scan-tree-dump-times {(?n)^OpenACC routine
>> 'fact_nohost\(int\)' has 'nohost' clause\.$} 1 oaccloops { target { c++ &&
>> offloading_enabled } } } }
>> TODO See PR101551 for 'offloading_enabled' differences. */
OK to push the attached
"Fortran: Use OpenACC's acc_on_device builtin, fix OpenMP'
__builtin_is_initial_device: Revert 'gimple_fold_builtin_acc_on_device' change"?
Grüße
Thomas
>From d4cf1d795a70b35082ec33315efe9e49fa6b0cbf Mon Sep 17 00:00:00 2001
From: Thomas Schwinge <[email protected]>
Date: Mon, 14 Oct 2024 10:45:06 +0200
Subject: [PATCH] Fortran: Use OpenACC's acc_on_device builtin, fix OpenMP'
__builtin_is_initial_device: Revert 'gimple_fold_builtin_acc_on_device'
change
The motivation of the 'gimple_fold_builtin_acc_on_device' change in
commit 3269a722b7a03613e9c4e2862bc5088c4a17cc11
"Fortran: Use OpenACC's acc_on_device builtin, fix OpenMP' __builtin_is_initial_device"
is unclear, and it unnecessarily diverges GCC's (default)
'--disable-offload-targets' vs. '--enable-offload-targets=[...]'
configurations.
PR testsuite/82250
gcc/
* gimple-fold.cc (gimple_fold_builtin_acc_on_device): Revert last
change.
libgomp/
* testsuite/libgomp.oacc-c-c++-common/routine-nohost-1.c: Revert
last change.
---
gcc/gimple-fold.cc | 2 +-
libgomp/testsuite/libgomp.oacc-c-c++-common/routine-nohost-1.c | 3 ++-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/gcc/gimple-fold.cc b/gcc/gimple-fold.cc
index 9a84483f9bf..942de7720fd 100644
--- a/gcc/gimple-fold.cc
+++ b/gcc/gimple-fold.cc
@@ -4190,7 +4190,7 @@ static bool
gimple_fold_builtin_acc_on_device (gimple_stmt_iterator *gsi, tree arg0)
{
/* Defer folding until we know which compiler we're in. */
- if (ENABLE_OFFLOADING && symtab->state != EXPANSION)
+ if (symtab->state != EXPANSION)
return false;
unsigned val_host = GOMP_DEVICE_HOST;
diff --git a/libgomp/testsuite/libgomp.oacc-c-c++-common/routine-nohost-1.c b/libgomp/testsuite/libgomp.oacc-c-c++-common/routine-nohost-1.c
index e64711b536b..7dc7459e5fe 100644
--- a/libgomp/testsuite/libgomp.oacc-c-c++-common/routine-nohost-1.c
+++ b/libgomp/testsuite/libgomp.oacc-c-c++-common/routine-nohost-1.c
@@ -36,7 +36,8 @@ static int fact_nohost(int n)
return fact(n);
}
-/* { dg-final { scan-tree-dump-times {(?n)^OpenACC routine 'fact_nohost' has 'nohost' clause\.$} 1 oaccloops { target { c && offloading_enabled } } } }
+/* { dg-final { scan-tree-dump-times {(?n)^OpenACC routine 'fact_nohost' has 'nohost' clause\.$} 1 oaccloops { target c } } }
+ { dg-final { scan-tree-dump-times {(?n)^OpenACC routine 'int fact_nohost\(int\)' has 'nohost' clause\.$} 1 oaccloops { target { c++ && { ! offloading_enabled } } } } }
{ dg-final { scan-tree-dump-times {(?n)^OpenACC routine 'fact_nohost\(int\)' has 'nohost' clause\.$} 1 oaccloops { target { c++ && offloading_enabled } } } }
TODO See PR101551 for 'offloading_enabled' differences. */
--
2.34.1
