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nir: add shader_clock intrinsic

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v2: Add flags and inline comment/description.
v3: None of the input/outputs are variables
v4: Drop clockARB reference, relate code motion barrier comment wrt
intrinsic flag.
v5: Drop the "thus we can eliminate..." comment (Connor)

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Emil Velikov 2015-10-07 11:59:26 +01:00 • committed by Emil Velikov
parent f1d98fc90a
commit 7682844f34
2 changed files with 14 additions and 0 deletions
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6
src/glsl/nir/glsl_to_nir.cpp
View file

@ -717,6 +717,8 @@ nir_visitor::visit(ir_call *ir)
op = nir_intrinsic_ssbo_atomic_exchange;
} else if (strcmp(ir->callee_name(), "__intrinsic_ssbo_atomic_comp_swap_internal") == 0) {
op = nir_intrinsic_ssbo_atomic_comp_swap;
} else if (strcmp(ir->callee_name(), "__intrinsic_shader_clock") == 0) {
op = nir_intrinsic_shader_clock;
} else {
unreachable("not reached");
}
@ -821,6 +823,10 @@ nir_visitor::visit(ir_call *ir)
case nir_intrinsic_memory_barrier:
nir_instr_insert_after_cf_list(this->cf_node_list, &instr->instr);
break;
case nir_intrinsic_shader_clock:
nir_ssa_dest_init(&instr->instr, &instr->dest, 1, NULL);
nir_instr_insert_after_cf_list(this->cf_node_list, &instr->instr);
break;
case nir_intrinsic_store_ssbo: {
exec_node *param = ir->actual_parameters.get_head();
ir_rvalue *block = ((ir_instruction *)param)->as_rvalue();

8
src/glsl/nir/nir_intrinsics.h
View file

@ -83,6 +83,14 @@ BARRIER(discard)
*/
BARRIER(memory_barrier)
/*
* Shader clock intrinsic with semantics analogous to the clock2x32ARB()
* GLSL intrinsic.
* The latter can be used as code motion barrier, which is currently not
* feasible with NIR.
*/
INTRINSIC(shader_clock, 0, ARR(), true, 1, 0, 0, NIR_INTRINSIC_CAN_ELIMINATE)
/** A conditional discard, with a single boolean source. */
INTRINSIC(discard_if, 1, ARR(1), false, 0, 0, 0, 0)