https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113599
Tom de Vries changed:
What|Removed |Added
CC||vries at gcc dot gnu.org
--- Comment #2
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112565
--- Comment #1 from Tom de Vries ---
(In reply to Anonymous from comment #0)
> Tom de Vries suggests that this issue may be attributed to a GCC
> optimization bug.
I do not.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110799
--- Comment #7 from Tom de Vries ---
(In reply to Alexander Monakov from comment #5)
> This trips Valgrind's data race detector (valgrind --tool=helgrind) too. So
> I don't think checking SANITIZE_THREAD is the correct approach.
Can you
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110799
--- Comment #6 from Tom de Vries ---
(In reply to rguent...@suse.de from comment #4)
> I'm suggesting to not fix it ;)
Can you explain why ?
It doesn't look difficult to fix to me, and I don't see any downsides.
> That said, is TSAN a
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110799
--- Comment #2 from Tom de Vries ---
(In reply to Richard Biener from comment #1)
> We consider introducing load data races OK, what's the difference here?
This is a load vs. store data race.
> There are other passes that would do similar
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110799
Bug ID: 110799
Summary: [tsan] False positive due to -fhoist-adjacent-loads
Product: gcc
Version: 13.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109708
Bug ID: 109708
Summary: [c, doc] wdangling-pointer example broken
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108600
--- Comment #4 from Tom de Vries ---
(In reply to Tom de Vries from comment #0)
> Note that for for instance gdb test-case gdb.ada/ref_param.exp, this
> convention was broken for gcc 7.5.0 (and I don't know how much earlier), and
> my current
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108615
Tom de Vries changed:
What|Removed |Added
Status|UNCONFIRMED |RESOLVED
Resolution|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108615
Bug ID: 108615
Summary: Incorrect prologue marker in line table
Product: gcc
Version: 10.4.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108600
--- Comment #3 from Tom de Vries ---
(In reply to Tom de Vries from comment #2)
> (In reply to Tom de Vries from comment #1)
> > Created attachment 54371 [details]
>
> We probably don't want to emit in all cases, maybe limiting to
>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47471
Tom de Vries changed:
What|Removed |Added
CC||vries at gcc dot gnu.org
--- Comment #24
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108600
--- Comment #2 from Tom de Vries ---
(In reply to Tom de Vries from comment #1)
> Created attachment 54371 [details]
We probably don't want to emit in all cases, maybe limiting to
"dwarf_version >= 3", or "!dwarf_strict || dwarf_version >=
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108600
--- Comment #1 from Tom de Vries ---
Created attachment 54371
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54371=edit
tentative patch
Tentative patch.
For hello.c, for the -gas-loc-support case it gives us:
...
$ gcc -g ~/hello.c -S
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108600
Bug ID: 108600
Summary: Use DW_LNS_set_prologue_end
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: debug
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108098
--- Comment #1 from Tom de Vries ---
(In reply to Thomas Schwinge from comment #0)
> $ nvidia-smi
> [...]
> | NVIDIA-SMI 440.33.01Driver Version: 440.33.01CUDA Version: 10.2
> [...]
> | 0 Tesla K80 [...]
>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107909
Bug ID: 107909
Summary: [powerpc64le, debug] Incorrect call site location due
to nop after call insn
Product: gcc
Version: 7.5.0
Status: UNCONFIRMED
Severity:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87741
Tom de Vries changed:
What|Removed |Added
CC||vries at gcc dot gnu.org
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99555
--- Comment #17 from Tom de Vries ---
(In reply to Thomas Schwinge from comment #14)
> > That's with a Nvidia Tesla K20c GPU, Driver Version: 346.46.
> > As that version is "a bit old", I shall first update this, before we spend
> > any further
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105772
--- Comment #2 from Tom de Vries ---
As background info, I'm proposing a patch for gdb to have the
architecture-specific prologue skipper skip over the get_pc_thunk call:
https://sourceware.org/pipermail/gdb-patches/2022-May/189563.html , which
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105772
Bug ID: 105772
Summary: [debug, i386] sched2 moves get_pc_thunk call past
debug_insn
Product: gcc
Version: 12.1.0
Status: UNCONFIRMED
Severity: normal
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104893
Tom de Vries changed:
What|Removed |Added
Resolution|--- |WORKSFORME
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104857
Tom de Vries changed:
What|Removed |Added
Resolution|--- |FIXED
Status|UNCONFIRMED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104714
Tom de Vries changed:
What|Removed |Added
Target Milestone|--- |12.0
Resolution|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105096
Bug ID: 105096
Summary: --target-help not an alias for --help=target
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: trivial
Priority: P3
Component:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53037
Tom de Vries changed:
What|Removed |Added
CC||vries at gcc dot gnu.org
--- Comment #43
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81909
Tom de Vries changed:
What|Removed |Added
Status|NEW |RESOLVED
Resolution|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81728
Tom de Vries changed:
What|Removed |Added
Resolution|--- |WORKSFORME
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104818
Tom de Vries changed:
What|Removed |Added
Resolution|--- |FIXED
Status|NEW
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105042
Tom de Vries changed:
What|Removed |Added
Severity|normal |enhancement
--- Comment #8 from Tom de
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105075
--- Comment #6 from Tom de Vries ---
Created attachment 52698
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52698=edit
Demonstrator patch with stepping stone patterns for combine
(In reply to Tom de Vries from comment #2)
> Also, I
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105014
--- Comment #6 from Tom de Vries ---
Reproducer filed at https://github.com/vries/nvidia-bugs/tree/master/shift-and
PR filed at nvidia ( https://developer.nvidia.com/nvidia_bug/3585290 ).
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105075
Tom de Vries changed:
What|Removed |Added
Attachment #52693|0 |1
is obsolete|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105075
--- Comment #2 from Tom de Vries ---
AFAIU, at gimple level support is limited to vectors, so that doesn't help to
generate the insn for the simple, scalar case.
It would be nice if combine could generate it and we wouldn't have to use a
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105075
--- Comment #1 from Tom de Vries ---
Created attachment 52693
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52693=edit
Demonstrator patch
This patch adds:
- modeling of insn sad.u32 in the .md file
- peephole2 to generate it
(which is
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105075
Bug ID: 105075
Summary: [nvptx] Generate sad insn (sum of absolute
differences)
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: enhancement
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105042
--- Comment #5 from Tom de Vries ---
(In reply to Richard Biener from comment #1)
> Doesn't whatever driver/library API we use from libgomp to invoke workloads
> report actual errors? Maybe we need to improve there.
This:
...
libgomp:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105042
--- Comment #4 from Tom de Vries ---
https://gcc.gnu.org/pipermail/gcc-patches/2022-March/592275.html
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105042
--- Comment #3 from Tom de Vries ---
(In reply to Tom de Vries from comment #2)
> (In reply to Richard Biener from comment #1)
> > Doesn't whatever driver/library API we use from libgomp to invoke workloads
> > report actual errors? Maybe we
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105014
--- Comment #5 from Tom de Vries ---
Minimal test-case:
...
void __attribute__((noinline)) foo (unsigned long long d0) {
unsigned long long __a;
__a = 0x38;
for (; __a > 0; __a -= 8)
if (((d0 >> __a) & 0xff) != 0)
break;
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105011
Tom de Vries changed:
What|Removed |Added
Status|UNCONFIRMED |RESOLVED
Target Milestone|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105042
--- Comment #2 from Tom de Vries ---
(In reply to Richard Biener from comment #1)
> Doesn't whatever driver/library API we use from libgomp to invoke workloads
> report actual errors? Maybe we need to improve there.
Good point, it reported
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105014
--- Comment #4 from Tom de Vries ---
(In reply to Tom de Vries from comment #1)
> With -O0 JIT instead:
Also OK with JIT -O1, problems start at JIT -O2.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105011
--- Comment #3 from Tom de Vries ---
Submitted fix :
https://gcc.gnu.org/pipermail/gcc-patches/2022-March/592211.html
Though without changelog, apparently.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105042
Bug ID: 105042
Summary: [libgomp, GOMP_NVPTX_JIT=-O0] Openacc testsuite
failures when X runs on nvidia driver
Product: gcc
Version: 12.0
Status: UNCONFIRMED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105019
--- Comment #6 from Tom de Vries ---
(In reply to Tom de Vries from comment #4)
> OK, I think this is the pattern:
> ...
> $ cat gcc/testsuite/gcc.target/nvptx/alias-5.c
FTR, same thing if I use static functions:
...
static void
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105019
--- Comment #5 from Tom de Vries ---
Creating a CUDA example is hampered by the fact that there's no symbol alias
support, AFAICT.
I'd like to write something like:
...
__device__ void __foo ()
{
printf ("__foo\n");
}
__device__ void foo ()
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105019
--- Comment #4 from Tom de Vries ---
OK, I think this is the pattern:
...
$ cat gcc/testsuite/gcc.target/nvptx/alias-5.c
/* { dg-do link } */
/* { dg-do run { target runtime_ptx_isa_version_6_3 } } */
/* { dg-options "-save-temps -malias
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105019
--- Comment #3 from Tom de Vries ---
Aliases in failing .exe:
...
$ strings declare_target-1.exe | grep "\.alias"
.alias gomp_ialias_GOMP_taskgroup_start,GOMP_taskgroup_start;
.alias gomp_ialias_GOMP_taskgroup_end,GOMP_taskgroup_end;
.alias
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105019
--- Comment #2 from Tom de Vries ---
Aliases in libgomp.a:
...
$ grep "\.alias"
build-gcc-offload-nvptx-none/nvptx-none/mgomp/libgomp/.libs/libgomp.a
.alias gomp_ialias_GOMP_loop_runtime_next,GOMP_loop_runtime_next;
.alias
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105019
--- Comment #1 from Tom de Vries ---
To trigger:
...
diff --git a/gcc/config/nvptx/nvptx.cc b/gcc/config/nvptx/nvptx.cc
index 87efc23bd96..8bf9ea90a77 100644
--- a/gcc/config/nvptx/nvptx.cc
+++ b/gcc/config/nvptx/nvptx.cc
@@ -245,6 +245,9 @@
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105019
Bug ID: 105019
Summary: [nvptx] malias in libgomp results in "Internal error:
reference to deleted section"
Product: gcc
Version: 12.0
Status: UNCONFIRMED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105014
--- Comment #3 from Tom de Vries ---
(In reply to Tom de Vries from comment #2)
> (In reply to Tom de Vries from comment #0)
> > On a quadro k2000 with driver 470.103.01, I run into:
>
> So, sm_30.
>
> > ...
> > FAIL: gcc.dg/pr97459-1.c
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105014
--- Comment #2 from Tom de Vries ---
(In reply to Tom de Vries from comment #0)
> On a quadro k2000 with driver 470.103.01, I run into:
So, sm_30.
> ...
> FAIL: gcc.dg/pr97459-1.c execution test
Reproduced on geforce gt710 (sm_35), with same
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105018
--- Comment #2 from Tom de Vries ---
As mentioned before by amonakov, a possibility is to add alias support to the
nvptx-tools linker, and use that.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105018
--- Comment #1 from Tom de Vries ---
(In reply to Tom de Vries from comment #0)
> Aliases to aliases are not supported (see libgomp.c-c++-common/pr96390.c).
> This is currently not prohibited by the compiler, but with the driver link we
> run
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105018
Bug ID: 105018
Summary: [nvptx] Need better alias support
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: target
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97106
Tom de Vries changed:
What|Removed |Added
Status|UNCONFIRMED |RESOLVED
Target Milestone|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97106
Bug 97106 depends on bug 97102, which changed state.
Bug 97102 Summary: [nvptx] PTX JIT compilation failed when using aliases
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97102
What|Removed |Added
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97102
Tom de Vries changed:
What|Removed |Added
Target Milestone|--- |12.0
Resolution|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98215
Tom de Vries changed:
What|Removed |Added
Severity|normal |enhancement
Keywords|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104916
Tom de Vries changed:
What|Removed |Added
Target Milestone|--- |12.0
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104916
Tom de Vries changed:
What|Removed |Added
Status|UNCONFIRMED |RESOLVED
Resolution|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104783
Tom de Vries changed:
What|Removed |Added
Resolution|--- |FIXED
Target Milestone|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104957
Tom de Vries changed:
What|Removed |Added
Target Milestone|--- |12.0
Status|UNCONFIRMED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104925
Tom de Vries changed:
What|Removed |Added
Resolution|--- |FIXED
Status|UNCONFIRMED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105016
--- Comment #3 from Tom de Vries ---
In libgcc.h, I see:
...
#define __udivmoddi4__NDW(udivmod,4)
...
and for LIBGCC2_UNITS_PER_WORD == 8 we have:
...
#define __NDW(a,b) __ ## a ## ti ## b
...
So, AFAICT it's possible that
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105016
--- Comment #1 from Tom de Vries ---
Created attachment 52662
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52662=edit
test-case
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105016
Bug ID: 105016
Summary: [libgcc, TARGET_HAS_NO_HW_DIVIDE] Incorrect result for
__udivmodti4
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105014
--- Comment #1 from Tom de Vries ---
First FAIL minimizes to:
...
typedef __uint128_t T;
union u {
T t;
struct {
unsigned long long x;
unsigned long long y;
} xy;
};
#define PRINT(VAR) \
do
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105014
Bug ID: 105014
Summary: [nvptx] FAIL: gcc.dg/pr97459-1.c execution test
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105011
--- Comment #2 from Tom de Vries ---
Even better:
...
diff --git a/libatomic/tas_n.c b/libatomic/tas_n.c
index d0d8c283b495..65eaa7753a51 100644
--- a/libatomic/tas_n.c
+++ b/libatomic/tas_n.c
@@ -73,7 +73,7 @@ SIZE(libat_test_and_set) (UTYPE
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105011
--- Comment #1 from Tom de Vries ---
(In reply to Tom de Vries from comment #0)
> It should probably do something like:
> ...
> return (woldval & wval) != 0;
> ...
Indeed, that fixes the FAILs.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105011
Bug ID: 105011
Summary: [nvptx] FAIL: gcc.dg/atomic/stdatomic-flag-2.c -O1
execution test
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105001
--- Comment #1 from Tom de Vries ---
Interesting.
Can you compare dump files to see where the difference comes from?
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104936
Tom de Vries changed:
What|Removed |Added
Severity|normal |enhancement
Keywords|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104991
Bug ID: 104991
Summary: [nvptx] Simplify muniform-simt transformation
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104968
Tom de Vries changed:
What|Removed |Added
Resolution|--- |FIXED
Target Milestone|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104952
Tom de Vries changed:
What|Removed |Added
Resolution|--- |FIXED
Target Milestone|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104968
--- Comment #6 from Tom de Vries ---
(In reply to Tom de Vries from comment #5)
> This patch fixes the ICE at openmp level:
> ...
> diff --git a/gcc/gimplify.cc b/gcc/gimplify.cc
> index 139a0de6100..19af384c634 100644
> --- a/gcc/gimplify.cc
>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104957
Tom de Vries changed:
What|Removed |Added
Severity|normal |enhancement
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104968
Tom de Vries changed:
What|Removed |Added
CC||jakub at gcc dot gnu.org
--- Comment #5
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104968
--- Comment #4 from Tom de Vries ---
This ( https://gcc.gnu.org/pipermail/gcc-patches/2022-March/591912.html )
proposed patch fixes this ICE, pinged again.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104968
--- Comment #3 from Tom de Vries ---
(In reply to Tom de Vries from comment #2)
> (In reply to Tom de Vries from comment #1)
> > Can't reproduce.
> >
> > It this not fixed by:
> > ...
> > commit 7862f6ccd85a001e4d70abb00bb95d8c7846ba80
> >
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104968
--- Comment #2 from Tom de Vries ---
(In reply to Tom de Vries from comment #1)
> Can't reproduce.
>
> It this not fixed by:
> ...
> commit 7862f6ccd85a001e4d70abb00bb95d8c7846ba80
> Author: Tom de Vries
> Date: Wed Feb 23 09:33:33 2022
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104968
--- Comment #1 from Tom de Vries ---
Can't reproduce.
It this not fixed by:
...
commit 7862f6ccd85a001e4d70abb00bb95d8c7846ba80
Author: Tom de Vries
Date: Wed Feb 23 09:33:33 2022 +0100
[nvptx] Fix dummy location in gen_comment
...
?
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104952
--- Comment #9 from Tom de Vries ---
Created attachment 52647
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52647=edit
Tentative patch with test-cases, rationale and changelog
I'll put this through testing, and submit if no problems
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104952
--- Comment #8 from Tom de Vries ---
(In reply to Jakub Jelinek from comment #6)
> And yes, #c1 is valid.
Thanks for confirming.
> But would be nice to have similar test with && and
> initial result = 2; and arr[] say { 1, 2, 3, 4, 5, 6, 7,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104952
--- Comment #7 from Tom de Vries ---
Alternative fix that doesn't require fiddling with the 'code' var:
...
diff --git a/gcc/omp-low.cc b/gcc/omp-low.cc
index d932d74cb03..d0ddd4a6142 100644
--- a/gcc/omp-low.cc
+++ b/gcc/omp-low.cc
@@ -6734,7
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104952
--- Comment #4 from Tom de Vries ---
This fixes it:
...
diff --git a/gcc/omp-low.cc b/gcc/omp-low.cc
index d932d74cb03..f2ac8f98e32 100644
--- a/gcc/omp-low.cc
+++ b/gcc/omp-low.cc
@@ -6734,7 +6734,21 @@ lower_rec_input_clauses (tree clauses,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104952
--- Comment #3 from Tom de Vries ---
Hmm, that seems to be actually due to:
...
if (sctx.is_simt)
{
if (!simt_lane)
simt_lane = create_tmp_var
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104952
--- Comment #2 from Tom de Vries ---
I think the problem can be seen already at omp-lower, in the body of the
butterfly loop.
Let's first look at what we have if we use reduction op '|':
...
D.2173 = .GOMP_SIMT_VF ();
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104952
Tom de Vries changed:
What|Removed |Added
Keywords||openmp
--- Comment #1 from Tom de Vries
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104957
--- Comment #3 from Tom de Vries ---
The OvO testsuite, when run at -O2 passes, because it inlines all .alias
instances.
But at -O0, it doesn't. With -foffload=-malias that's fixed.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104957
--- Comment #2 from Tom de Vries ---
So, what do we get after specifying -malias -mptx=6.3?
Alias attribute only for functions, not variables.
No support for weak alias (allowing this does compile, but we run into
execution fails in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104957
--- Comment #1 from Tom de Vries ---
Created attachment 52636
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52636=edit
Tentative patch
Patch that I'm currently working on.
Adds -malias, off by default.
It's off by default because when
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104957
Bug ID: 104957
Summary: [nvptx] Use .alias directive (available starting ptx
isa version 6.3)
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97106
--- Comment #4 from Tom de Vries ---
This:
...
$ cat alias.c
void __f ()
{
__builtin_printf ("hello\n");
}
void f () __attribute__ ((alias ("__f")));
int
main (void)
{
f ();
return 0;
}
...
works fine at -O0 and -O1:
...
$ ./gcc.sh -O0
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104936
Bug ID: 104936
Summary: [nvptx] Handle weak decl/def distinction in common
code
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104768
--- Comment #1 from Tom de Vries ---
Hmm, reading about it a bit more, it's more about enabling algorithms that were
not possible before, than about performance improvements.
So, we should aim at having test-cases, both openacc and openmp that
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