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asahi: optimize !robustness with soft fault

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Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31532>
This commit is contained in:
Alyssa Rosenzweig 2024-10-01 12:35:10 -04:00 • committed by Marge Bot
parent d5ec115260
commit db36ece9dd
1 changed files with 13 additions and 16 deletions
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29
src/asahi/lib/agx_nir_lower_vbo.c
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@ -187,25 +187,15 @@ pass(struct nir_builder *b, nir_intrinsic_instr *intr, void *data)
/* Robustness is handled at the ID level */
nir_def *bounds = nir_load_attrib_clamp_agx(b, buf_handle);
/* For now, robustness is always applied. This gives GL robustness semantics.
* For robustBufferAccess2, we'll want to check for out-of-bounds access
* (where el > bounds), and replace base with the address of a zero sink.
* With soft fault and a large enough sink, we don't need to clamp the index,
* allowing that robustness behaviour to be implemented in 2 cmpsel
* before the load. That is faster than the 4 cmpsel required after the load,
* and it avoids waiting on the load which should help prolog performance.
*
* TODO: Optimize.
*
*/
nir_def *oob = nir_ult(b, bounds, el);
/* TODO: We clamp to handle null descriptors. This should be optimized
* further. However, with the fix up after the load for D3D robustness, we
* don't need this clamp if we can ignore the fault.
/* We clamp to handle GL robustness. This should be optimized further.
* However, with the fix up after the load for D3D robustness, we don't need
* this clamp if we can ignore the fault.
*/
if (!(ctx->rs.level >= AGX_ROBUSTNESS_D3D && ctx->rs.soft_fault)) {
if (ctx->rs.level >= AGX_ROBUSTNESS_GL &&
!(ctx->rs.level >= AGX_ROBUSTNESS_D3D && ctx->rs.soft_fault)) {
el = nir_bcsel(b, oob, nir_imm_int(b, 0), el);
}
@ -320,6 +310,13 @@ agx_nir_lower_vbo(nir_shader *shader, struct agx_attribute *attribs,
{
assert(shader->info.stage == MESA_SHADER_VERTEX);
/* To implement null vertex buffer descriptors, we need either soft fault or
* GL robustness with a vertex buffer at 0x0.
*/
if (!robustness.soft_fault) {
robustness.level = MAX2(robustness.level, AGX_ROBUSTNESS_GL);
}
struct ctx ctx = {.attribs = attribs, .rs = robustness};
return nir_shader_intrinsics_pass(shader, pass, nir_metadata_control_flow,
&ctx);