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glsl: Use hash tables for opt_constant_propagation() kill sets.

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Cuts compile/link time of the fragment shader in #91857 by 19%
(16.28 -> 13.05).

I didn't bother with the acp sets because they're smaller, but it
might be worth doing as well.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91857
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Thomas Helland <thomashelland90@gmail.com>
Reviewed-by: Timothy Arceri <t_arceri@yahoo.com.au>
Tested-by: Tapani Pälli <tapani.palli@intel.com>
This commit is contained in:
Kenneth Graunke
2014-11-11 23:16:13 -08:00
parent e20f30eb51
commit 4654439fdd
1 changed files with 28 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
src/glsl/opt_constant_propagation.cpp
View File

@@ -40,6 +40,7 @@
#include "ir_basic_block.h"
#include "ir_optimization.h"
#include "glsl_types.h"
#include "util/hash_table.h"
namespace {
@@ -95,7 +96,8 @@ public:
killed_all = false;
mem_ctx = ralloc_context(0);
this->acp = new(mem_ctx) exec_list;
this->kills = new(mem_ctx) exec_list;
this->kills = _mesa_hash_table_create(mem_ctx, _mesa_hash_pointer,
_mesa_key_pointer_equal);
}
~ir_constant_propagation_visitor()
{
@@ -123,7 +125,7 @@ public:
* List of kill_entry: The masks of variables whose values were
* killed in this block.
*/
exec_list *kills;
hash_table *kills;
bool progress;
@@ -263,11 +265,12 @@ ir_constant_propagation_visitor::visit_enter(ir_function_signature *ir)
* main() at link time, so they're irrelevant to us.
*/
exec_list *orig_acp = this->acp;
exec_list *orig_kills = this->kills;
hash_table *orig_kills = this->kills;
bool orig_killed_all = this->killed_all;
this->acp = new(mem_ctx) exec_list;
this->kills = new(mem_ctx) exec_list;
this->kills = _mesa_hash_table_create(mem_ctx, _mesa_hash_pointer,
_mesa_key_pointer_equal);
this->killed_all = false;
visit_list_elements(this, &ir->body);
@@ -352,11 +355,12 @@ void
ir_constant_propagation_visitor::handle_if_block(exec_list *instructions)
{
exec_list *orig_acp = this->acp;
exec_list *orig_kills = this->kills;
hash_table *orig_kills = this->kills;
bool orig_killed_all = this->killed_all;
this->acp = new(mem_ctx) exec_list;
this->kills = new(mem_ctx) exec_list;
this->kills = _mesa_hash_table_create(mem_ctx, _mesa_hash_pointer,
_mesa_key_pointer_equal);
this->killed_all = false;
/* Populate the initial acp with a constant of the original */
@@ -370,12 +374,14 @@ ir_constant_propagation_visitor::handle_if_block(exec_list *instructions)
orig_acp->make_empty();
}
exec_list *new_kills = this->kills;
hash_table *new_kills = this->kills;
this->kills = orig_kills;
this->acp = orig_acp;
this->killed_all = this->killed_all || orig_killed_all;
foreach_in_list(kill_entry, k, new_kills) {
hash_entry *htk;
hash_table_foreach(new_kills, htk) {
kill_entry *k = (kill_entry *) htk->data;
kill(k->var, k->write_mask);
}
}
@@ -397,7 +403,7 @@ ir_visitor_status
ir_constant_propagation_visitor::visit_enter(ir_loop *ir)
{
exec_list *orig_acp = this->acp;
exec_list *orig_kills = this->kills;
hash_table *orig_kills = this->kills;
bool orig_killed_all = this->killed_all;
/* FINISHME: For now, the initial acp for loops is totally empty.
@@ -405,7 +411,8 @@ ir_constant_propagation_visitor::visit_enter(ir_loop *ir)
* cloned minus the killed entries after the first run through.
*/
this->acp = new(mem_ctx) exec_list;
this->kills = new(mem_ctx) exec_list;
this->kills = _mesa_hash_table_create(mem_ctx, _mesa_hash_pointer,
_mesa_key_pointer_equal);
this->killed_all = false;
visit_list_elements(this, &ir->body_instructions);
@@ -414,12 +421,14 @@ ir_constant_propagation_visitor::visit_enter(ir_loop *ir)
orig_acp->make_empty();
}
exec_list *new_kills = this->kills;
hash_table *new_kills = this->kills;
this->kills = orig_kills;
this->acp = orig_acp;
this->killed_all = this->killed_all || orig_killed_all;
foreach_in_list(kill_entry, k, new_kills) {
hash_entry *htk;
hash_table_foreach(new_kills, htk) {
kill_entry *k = (kill_entry *) htk->data;
kill(k->var, k->write_mask);
}
@@ -448,14 +457,15 @@ ir_constant_propagation_visitor::kill(ir_variable *var, unsigned write_mask)
/* Add this writemask of the variable to the list of killed
* variables in this block.
*/
foreach_in_list(kill_entry, entry, this->kills) {
if (entry->var == var) {
entry->write_mask |= write_mask;
return;
}
hash_entry *kill_hash_entry = _mesa_hash_table_search(this->kills, var);
if (kill_hash_entry) {
kill_entry *entry = (kill_entry *) kill_hash_entry->data;
entry->write_mask |= write_mask;
return;
}
/* Not already in the list. Make new entry. */
this->kills->push_tail(new(this->mem_ctx) kill_entry(var, write_mask));
_mesa_hash_table_insert(this->kills, var,
new(this->mem_ctx) kill_entry(var, write_mask));
}
/**