[Mesa-dev] [PATCH v4 (part2) 29/59] nir: Implement __intrinsic_store_ssbo
Iago Toral
itoral at igalia.com
Fri Aug 7 01:15:21 PDT 2015
On Fri, 2015-08-07 at 07:43 +0200, Iago Toral wrote:
> On Thu, 2015-08-06 at 11:06 -0700, Connor Abbott wrote:
> > On Thu, Aug 6, 2015 at 12:30 AM, Iago Toral <itoral at igalia.com> wrote:
> > > On Wed, 2015-08-05 at 12:17 -0700, Connor Abbott wrote:
> > >> On Wed, Aug 5, 2015 at 1:30 AM, Iago Toral Quiroga <itoral at igalia.com> wrote:
> > >> > ---
> > >> > src/glsl/nir/glsl_to_nir.cpp | 36 ++++++++++++++++++++++++++++++++++++
> > >> > src/glsl/nir/nir_intrinsics.h | 12 ++++++------
> > >> > 2 files changed, 42 insertions(+), 6 deletions(-)
> > >> >
> > >> > diff --git a/src/glsl/nir/glsl_to_nir.cpp b/src/glsl/nir/glsl_to_nir.cpp
> > >> > index 642affd..cbec2df 100644
> > >> > --- a/src/glsl/nir/glsl_to_nir.cpp
> > >> > +++ b/src/glsl/nir/glsl_to_nir.cpp
> > >> > @@ -641,6 +641,8 @@ nir_visitor::visit(ir_call *ir)
> > >> > op = nir_intrinsic_image_atomic_comp_swap;
> > >> > } else if (strcmp(ir->callee_name(), "__intrinsic_memory_barrier") == 0) {
> > >> > op = nir_intrinsic_memory_barrier;
> > >> > + } else if (strcmp(ir->callee_name(), "__intrinsic_store_ssbo") == 0) {
> > >> > + op = nir_intrinsic_store_ssbo;
> > >> > } else {
> > >> > unreachable("not reached");
> > >> > }
> > >> > @@ -730,6 +732,40 @@ nir_visitor::visit(ir_call *ir)
> > >> > }
> > >> > case nir_intrinsic_memory_barrier:
> > >> > break;
> > >> > + case nir_intrinsic_store_ssbo: {
> > >> > + exec_node *param = ir->actual_parameters.get_head();
> > >> > + ir_rvalue *block = ((ir_instruction *)param)->as_rvalue();
> > >> > +
> > >> > + param = param->get_next();
> > >> > + ir_rvalue *offset = ((ir_instruction *)param)->as_rvalue();
> > >> > +
> > >> > + param = param->get_next();
> > >> > + ir_rvalue *val = ((ir_instruction *)param)->as_rvalue();
> > >> > +
> > >> > + param = param->get_next();
> > >> > + ir_constant *write_mask = ((ir_instruction *)param)->as_constant();
> > >> > + assert(write_mask);
> > >> > +
> > >> > + /* Check if we need the indirect version */
> > >> > + ir_constant *const_offset = offset->as_constant();
> > >> > + if (!const_offset) {
> > >> > + op = nir_intrinsic_store_ssbo_indirect;
> > >> > + ralloc_free(instr);
> > >> > + instr = nir_intrinsic_instr_create(shader, op);
> > >> > + instr->src[2] = evaluate_rvalue(offset);
> > >> > + instr->const_index[0] = 0;
> > >> > + } else {
> > >> > + instr->const_index[0] = const_offset->value.u[0];
> > >> > + }
> > >> > +
> > >> > + instr->const_index[1] = write_mask->value.u[0];
> > >> > +
> > >> > + instr->src[0] = evaluate_rvalue(val);
> > >> > + instr->num_components = val->type->vector_elements;
> > >> > +
> > >> > + instr->src[1] = evaluate_rvalue(block);
> > >> > + break;
> > >> > + }
> > >> > default:
> > >> > unreachable("not reached");
> > >> > }
> > >> > diff --git a/src/glsl/nir/nir_intrinsics.h b/src/glsl/nir/nir_intrinsics.h
> > >> > index f264f55..83eeecd 100644
> > >> > --- a/src/glsl/nir/nir_intrinsics.h
> > >> > +++ b/src/glsl/nir/nir_intrinsics.h
> > >> > @@ -176,12 +176,12 @@ LOAD(input, 0, NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
> > >> > * offset.
> > >> > */
> > >> >
> > >> > -#define STORE(name, num_indices, flags) \
> > >> > - INTRINSIC(store_##name, 1, ARR(0), false, 0, 0, num_indices, flags) \
> > >> > - INTRINSIC(store_##name##_indirect, 2, ARR(0, 1), false, 0, 0, \
> > >> > +#define STORE(name, extra_srcs, num_indices, flags) \
> > >> > + INTRINSIC(store_##name, extra_srcs, ARR(0, 1), false, 0, 0, num_indices, flags) \
> > >> > + INTRINSIC(store_##name##_indirect, extra_srcs + 1, ARR(0, 1, 1), false, 0, 0, \
> > >> > num_indices, flags) \
> > >> >
> > >> > -STORE(output, 1, 0)
> > >> > -/* STORE(ssbo, 2, 0) */
> > >> > +STORE(output, 1, 2, 0)
> > >> > +STORE(ssbo, 2, 2, 0)
> > >>
> > >> I don't think outputs should have any extra sources, since they only
> > >> take a constant index, plus possibly an indirect source that's already
> > >> covered by the STORE macro. SSBO stores should only have one extra
> > >> source for the block index. Also, we should update the comment above
> > >> to explain this similarly to the paragraph above the loads.
> > >
> > > SSBO stores need an extra source for the block index and an extra index
> > > for a writemask.
> > >
> > > I'll leave the STORE() macro as it was and just define SSBO stores using
> > > INTRINSIC() directly then.
> >
> > Ok, I see. I don't think you need a separate INTRINSIC(), but right
> > now calling the parameter you added "extra_srcs" is confusing, since
> > you're counting the value to be stored, which isn't really "extra" at
> > all -- every store should have one! How about instead, we change the
> > STORE macro to have:
> >
> > - An "extra_srcs" parameter that contains only sources that are
> > actually extra, not counting the value to be stored -- direct stores
> > have "extra_srcs + 1" sources, and indirect sources have "extra_srcs +
> > 2" sources
> > - An "extra_indices" parameter that contains the extra indices, and
> > replace "num_indices" with "extra_indices + 1"
> >
> > Then normal stores have both set to 0, and SSBO stores have both set
> > to 1 to indicate the extra block index and writemask.
>
> Sure, sounds good to me.
I think I spoke too fast... the problem with this is that we also need
to inform about the size of the extra srcs (for ssbos, the extra srcs
should have a size of 1), so we would need another parameter for that,
and then the problem is that we need to join/expand that array with the
number of components for the non-extra srcs. I don't think there is a
way to do that with a macro, but even if there is, I wonder if it is
worth the extra complexity.... calling INTRINSIC directly is easy enough
I think.
The alternative would be to pass the number of components of all the
srcs (not just the extra srcs) in that extra argument, but that would
defeat the point of having a macro and careing only about the "extra"
stuff anyway...
Iago
>
> > >
> > >> >
> > >> > -LAST_INTRINSIC(store_output_indirect)
> > >> > +LAST_INTRINSIC(store_ssbo_indirect)
> > >> > --
> > >> > 1.9.1
> > >> >
> > >> > _______________________________________________
> > >> > mesa-dev mailing list
> > >> > mesa-dev at lists.freedesktop.org
> > >> > http://lists.freedesktop.org/mailman/listinfo/mesa-dev
> > >>
> > >
> > >
> >
>
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