Jakub,
On 01/08/2016 09:30 AM, Jakub Jelinek wrote:
On Fri, Jan 08, 2016 at 09:24:14AM -0600, James Norris wrote:
This patch removes the constraint whereby the PTX
emitted was only for sm_30 GPU's. With this removal,
the PTX emitted will be targeted for the current
context, i.e., attached GPU.
Bootstrapped/regtested on x86_64-linux, ok for trunk?
How does that work?
I see
static void
nvptx_file_start (void)
{
fputs ("// BEGIN PREAMBLE\n", asm_out_file);
fputs ("\t.version\t3.1\n", asm_out_file);
fputs ("\t.target\tsm_30\n", asm_out_file);
fprintf (asm_out_file, "\t.address_size %d\n", GET_MODE_BITSIZE (Pmode));
fputs ("// END PREAMBLE\n", asm_out_file);
}
which I'd guess means the PTX code can be executed in sm_30 and newer only
anyway.
Jakub
Yes. Per the PTX ISA manual for the .target directive: "In general,
generations of SM architectures follow an onion layer model, where
each generation adds new features and retains all features of
previous generations."
Jim
