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nir/opt_deref: Add a deref mode specialization optimization

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Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6332>
This commit is contained in:
Jason Ekstrand 2020-08-15 00:29:59 -05:00 • committed by Marge Bot
parent a8e53a772f
commit df51518dc5
1 changed files with 28 additions and 0 deletions
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28
src/compiler/nir/nir_deref.c
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@ -935,6 +935,30 @@ opt_remove_cast_cast(nir_deref_instr *cast)
return true; return true;
} }
/* Restrict variable modes in casts.
*
* If we know from something higher up the deref chain that the deref has a
* specific mode, we can cast to more general and back but we can never cast
* across modes. For non-cast derefs, we should only ever do anything here if
* the parent eventually comes from a cast that we restricted earlier.
*/
static bool
opt_restrict_deref_modes(nir_deref_instr *deref)
{
if (deref->type == nir_deref_type_var) {
assert(deref->modes == deref->var->data.mode);
return false;
}
nir_deref_instr *parent = nir_src_as_deref(deref->parent);
if (parent == NULL || parent->modes == deref->modes)
return false;
assert(parent->modes & deref->modes);
deref->modes &= parent->modes;
return true;
}
static bool static bool
opt_remove_sampler_cast(nir_deref_instr *cast) opt_remove_sampler_cast(nir_deref_instr *cast)
{ {
@ -1259,6 +1283,10 @@ nir_opt_deref_impl(nir_function_impl *impl)
switch (instr->type) { switch (instr->type) {
case nir_instr_type_deref: { case nir_instr_type_deref: {
nir_deref_instr *deref = nir_instr_as_deref(instr); nir_deref_instr *deref = nir_instr_as_deref(instr);
if (opt_restrict_deref_modes(deref))
progress = true;
switch (deref->deref_type) { switch (deref->deref_type) {
case nir_deref_type_ptr_as_array: case nir_deref_type_ptr_as_array:
if (opt_deref_ptr_as_array(&b, deref)) if (opt_deref_ptr_as_array(&b, deref))