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agx: Add break/continue support

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Following Dougall's notes closely.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11023>
This commit is contained in:
Alyssa Rosenzweig 2021-05-23 22:50:48 -04:00 • committed by Alyssa Rosenzweig
parent dd06e6af34
commit 839fff846a
1 changed files with 31 additions and 1 deletions
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32
src/asahi/compiler/agx_compile.c
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@ -681,10 +681,40 @@ agx_emit_tex(agx_builder *b, nir_tex_instr *instr)
agx_wait(b, 0);
}
/* NIR loops are treated as a pair of AGX loops:
*
* do {
* do {
* ...
* } while (0);
* } while (cond);
*
* By manipulating the nesting counter (r0l), we may break out of nested loops,
* so under the model, both break and continue may be implemented as breaks,
* where break breaks out of the outer loop (2 layers) and continue breaks out
* of the inner loop (1 layer).
*
* After manipulating the nesting counter directly, pop_exec #0 must be used to
* flush the update to the execution mask.
*/
static void
agx_emit_jump(agx_builder *b, nir_jump_instr *instr)
{
unreachable("stub");
assert (instr->type == nir_jump_break || instr->type == nir_jump_continue);
/* Break out of either one or two loops */
unsigned nestings = b->shader->loop_nesting;
if (instr->type == nir_jump_continue)
nestings += 1;
else if (instr->type == nir_jump_break)
nestings += 2;
/* Update the counter and flush */
agx_index r0l = agx_register(0, false);
agx_mov_to(b, r0l, agx_immediate(nestings));
agx_pop_exec(b, 0);
}
static void