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nir: Free instructions more often

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Soon we'll be allocating instructions out of a per-shader pool, which
means that if we don't free too many instructions during the main
optimization loop, the final nir_sweep() call will create holes which
can't be filled. By freeing instructions more aggressively, we can
allocate more instructions from the freelist which will reduce the final
memory usage.

Modified from Connor Abbott's original patch to rebase on top of
refactored DCE and so that the use-after-free in nir_algebraic_impl() is
fixed.

Co-authored-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12910>
This commit is contained in:
Connor Abbott
2019-03-19 14:16:41 +01:00
committed by Marge Bot
parent 8f159a8576
commit 9d9b891f94
3 changed files with 33 additions and 22 deletions
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24
src/compiler/nir/nir_opt_dce.c
View File

@@ -107,7 +107,8 @@ struct loop_state {
};
static bool
dce_block(nir_block *block, BITSET_WORD *defs_live, struct loop_state *loop)
dce_block(nir_block *block, BITSET_WORD *defs_live, struct loop_state *loop,
struct exec_list *dead_instrs)
{
bool progress = false;
bool phis_changed = false;
@@ -131,6 +132,7 @@ dce_block(nir_block *block, BITSET_WORD *defs_live, struct loop_state *loop)
instr->pass_flags = live;
} else if (!live) {
nir_instr_remove(instr);
exec_list_push_tail(dead_instrs, &instr->node);
progress = true;
}
}
@@ -146,20 +148,20 @@ dce_block(nir_block *block, BITSET_WORD *defs_live, struct loop_state *loop)
static bool
dce_cf_list(struct exec_list *cf_list, BITSET_WORD *defs_live,
struct loop_state *parent_loop)
struct loop_state *parent_loop, struct exec_list *dead_instrs)
{
bool progress = false;
foreach_list_typed_reverse(nir_cf_node, cf_node, node, cf_list) {
switch (cf_node->type) {
case nir_cf_node_block: {
nir_block *block = nir_cf_node_as_block(cf_node);
progress |= dce_block(block, defs_live, parent_loop);
progress |= dce_block(block, defs_live, parent_loop, dead_instrs);
break;
}
case nir_cf_node_if: {
nir_if *nif = nir_cf_node_as_if(cf_node);
progress |= dce_cf_list(&nif->else_list, defs_live, parent_loop);
progress |= dce_cf_list(&nif->then_list, defs_live, parent_loop);
progress |= dce_cf_list(&nif->else_list, defs_live, parent_loop, dead_instrs);
progress |= dce_cf_list(&nif->then_list, defs_live, parent_loop, dead_instrs);
mark_src_live(&nif->condition, defs_live);
break;
}
@@ -176,7 +178,7 @@ dce_cf_list(struct exec_list *cf_list, BITSET_WORD *defs_live,
struct set *predecessors = nir_loop_first_block(loop)->predecessors;
if (predecessors->entries == 1 &&
_mesa_set_next_entry(predecessors, NULL)->key == inner_state.preheader) {
progress |= dce_cf_list(&loop->body, defs_live, parent_loop);
progress |= dce_cf_list(&loop->body, defs_live, parent_loop, dead_instrs);
break;
}
@@ -185,7 +187,7 @@ dce_cf_list(struct exec_list *cf_list, BITSET_WORD *defs_live,
/* dce_cf_list() resets inner_state.header_phis_changed itself, so
* it doesn't have to be done here.
*/
dce_cf_list(&loop->body, defs_live, &inner_state);
dce_cf_list(&loop->body, defs_live, &inner_state, dead_instrs);
} while (inner_state.header_phis_changed);
/* We don't know how many times mark_cf_list() will repeat, so
@@ -199,6 +201,7 @@ dce_cf_list(struct exec_list *cf_list, BITSET_WORD *defs_live,
nir_foreach_instr_safe(instr, block) {
if (!instr->pass_flags) {
nir_instr_remove(instr);
exec_list_push_tail(dead_instrs, &instr->node);
progress = true;
}
}
@@ -222,12 +225,17 @@ nir_opt_dce_impl(nir_function_impl *impl)
BITSET_WORD *defs_live = rzalloc_array(NULL, BITSET_WORD,
BITSET_WORDS(impl->ssa_alloc));
struct exec_list dead_instrs;
exec_list_make_empty(&dead_instrs);
struct loop_state loop;
loop.preheader = NULL;
bool progress = dce_cf_list(&impl->body, defs_live, &loop);
bool progress = dce_cf_list(&impl->body, defs_live, &loop, &dead_instrs);
ralloc_free(defs_live);
nir_instr_free_list(&dead_instrs);
if (progress) {
nir_metadata_preserve(impl, nir_metadata_block_index |
nir_metadata_dominance);