* [committed] amdgcn: Pass -mstack-size through to runtime
@ 2023-02-06 17:22 Andrew Stubbs
2023-02-07 7:40 ` Tobias Burnus
0 siblings, 1 reply; 2+ messages in thread
From: Andrew Stubbs @ 2023-02-06 17:22 UTC (permalink / raw)
To: gcc-patches
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The -mstack-size option has been marked obsolete in favour of setting an
environment variable at runtime ("GCN_STACK_SIZE"), but some testcases
still need the option set or they have stack overflow. I could change
them to use the envvar, but my testing setup uses remote execute which
doesn't support that yet, and means I would skip my own tests (not ideal).
This patch causes the testcase to automatically set GCN_STACK_SIZE
itself, in a hidden constructor (only if it's not already set), and
therefore bypasses the problem. I'm leaving the documentation saying
-mstack-size is obsolete because this fix only works for offload tests,
and it's still not the preferred user solution.
Committed to mainline. I'll backport to OG12 shortly.
Andrew
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amdgcn: Pass -mstack-size through to runtime
But only for the offload case.
gcc/ChangeLog:
* config/gcn/mkoffload.cc (gcn_stack_size): New global variable.
(process_asm): Create a constructor for GCN_STACK_SIZE.
(main): Parse the -mstack-size option.
diff --git a/gcc/config/gcn/mkoffload.cc b/gcc/config/gcn/mkoffload.cc
index 9c262f974be..9493f89fec3 100644
--- a/gcc/config/gcn/mkoffload.cc
+++ b/gcc/config/gcn/mkoffload.cc
@@ -117,6 +117,8 @@ uint32_t elf_arch = EF_AMDGPU_MACH_AMDGCN_GFX803; // Default GPU architecture.
uint32_t elf_flags =
(EF_AMDGPU_FEATURE_XNACK_ANY_V4 | EF_AMDGPU_FEATURE_SRAMECC_ANY_V4);
+static int gcn_stack_size = 0; /* Zero means use default. */
+
/* Delete tempfiles. */
void
@@ -662,6 +664,18 @@ process_asm (FILE *in, FILE *out, FILE *cfile)
}
fprintf (cfile, "\n};\n\n");
+ /* Set the stack size if the user configured a value. */
+ if (gcn_stack_size)
+ fprintf (cfile,
+ "static __attribute__((constructor))\n"
+ "void configure_stack_size (void)\n"
+ "{\n"
+ " const char *val = getenv (\"GCN_STACK_SIZE\");\n"
+ " if (!val || val[0] == '\\0')\n"
+ " setenv (\"GCN_STACK_SIZE\", \"%d\", true);\n"
+ "}\n\n",
+ gcn_stack_size);
+
obstack_free (&fns_os, NULL);
for (i = 0; i < dims_count; i++)
free (dims[i].name);
@@ -920,6 +934,10 @@ main (int argc, char **argv)
elf_arch = EF_AMDGPU_MACH_AMDGCN_GFX908;
else if (strcmp (argv[i], "-march=gfx90a") == 0)
elf_arch = EF_AMDGPU_MACH_AMDGCN_GFX90a;
+#define STR "-mstack-size="
+ else if (startswith (argv[i], STR))
+ gcn_stack_size = atoi (argv[i] + strlen (STR));
+#undef STR
}
if (!(fopenacc ^ fopenmp))
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [committed] amdgcn: Pass -mstack-size through to runtime
2023-02-06 17:22 [committed] amdgcn: Pass -mstack-size through to runtime Andrew Stubbs
@ 2023-02-07 7:40 ` Tobias Burnus
0 siblings, 0 replies; 2+ messages in thread
From: Tobias Burnus @ 2023-02-07 7:40 UTC (permalink / raw)
To: Andrew Stubbs, gcc-patches
On 06.02.23 18:22, Andrew Stubbs wrote:
> The -mstack-size option has been marked obsolete in favour of setting
> an environment variable at runtime ("GCN_STACK_SIZE"), [...] but my
> testing setup uses remote execute which doesn't support that yet, and
> means I would skip my own tests (not ideal).
Namely, the problem with remote testing is that DejaGNU's setenv does
not work. This is a reoccurring theme but still unsolved, cf.
https://lists.gnu.org/archive/html/dejagnu/2008-07/msg00000.html
https://lists.gnu.org/archive/html/dejagnu/2019-11/msg00000.html
Now, only someone needs to find the time to fix DejaGNU ...
Tobias
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