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zink: remove discard_if

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Acked-by: Jordan Justen <jordan.l.justen@intel.com>
This commit is contained in:
Erik Faye-Lund 2018-11-01 21:44:09 +01:00
parent 6d96578912
commit ac530c1ce2
1 changed files with 46 additions and 0 deletions
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46
src/gallium/drivers/zink/zink_compiler.c
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@ -167,6 +167,51 @@ position_to_vulkan(nir_shader *s)
}
}
static bool
lower_discard_if_instr(nir_intrinsic_instr *instr, nir_builder *b)
{
if (instr->intrinsic == nir_intrinsic_discard_if) {
b->cursor = nir_before_instr(&instr->instr);
nir_if *if_stmt = nir_push_if(b, nir_ssa_for_src(b, instr->src[0], 1));
nir_intrinsic_instr *discard =
nir_intrinsic_instr_create(b->shader, nir_intrinsic_discard);
nir_builder_instr_insert(b, &discard->instr);
nir_pop_if(b, if_stmt);
nir_instr_remove(&instr->instr);
return true;
}
assert(instr->intrinsic != nir_intrinsic_discard ||
nir_block_last_instr(instr->instr.block) == &instr->instr);
return false;
}
static bool
lower_discard_if(nir_shader *shader)
{
bool progress = false;
nir_foreach_function(function, shader) {
if (function->impl) {
nir_builder builder;
nir_builder_init(&builder, function->impl);
nir_foreach_block(block, function->impl) {
nir_foreach_instr_safe(instr, block) {
if (instr->type == nir_instr_type_intrinsic)
progress |= lower_discard_if_instr(
nir_instr_as_intrinsic(instr),
&builder);
}
}
nir_metadata_preserve(function->impl, nir_metadata_dominance);
}
}
return progress;
}
static const struct nir_shader_compiler_options nir_options = {
.lower_all_io_to_temps = true,
.lower_ffma = true,
@ -257,6 +302,7 @@ zink_compile_nir(struct zink_screen *screen, struct nir_shader *nir)
NIR_PASS_V(nir, nir_lower_bool_to_float);
optimize_nir(nir);
NIR_PASS_V(nir, nir_remove_dead_variables, nir_var_function_temp);
NIR_PASS_V(nir, lower_discard_if);
if (zink_debug & ZINK_DEBUG_NIR) {
fprintf(stderr, "NIR shader:\n---8<---\n");