Mesa (master): r600/sfn: C++ lower-instruct implementation
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Tue Jan 12 19:37:15 UTC 2021
Module: Mesa
Branch: master
Commit: de4e4980d8d26f9496a7eba82145874c7bd00770
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=de4e4980d8d26f9496a7eba82145874c7bd00770
Author: Gert Wollny <gert.wollny at collabora.com>
Date: Sun Jan 10 11:34:43 2021 +0100
r600/sfn: C++ lower-instruct implementation
Signed-off-by: Gert Wollny <gert.wollny at collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7824>
---
src/gallium/drivers/r600/sfn/sfn_nir.cpp | 96 ++++++++++++++++++++++++++++++++
src/gallium/drivers/r600/sfn/sfn_nir.h | 18 ++++++
2 files changed, 114 insertions(+)
diff --git a/src/gallium/drivers/r600/sfn/sfn_nir.cpp b/src/gallium/drivers/r600/sfn/sfn_nir.cpp
index 8a30acd0698..5c950da988e 100644
--- a/src/gallium/drivers/r600/sfn/sfn_nir.cpp
+++ b/src/gallium/drivers/r600/sfn/sfn_nir.cpp
@@ -47,6 +47,102 @@ namespace r600 {
using std::vector;
+
+NirLowerInstruction::NirLowerInstruction():
+ b(nullptr)
+{
+
+}
+
+bool NirLowerInstruction::run(nir_shader *shader)
+{
+ bool progress = false;
+
+ nir_metadata preserved = nir_metadata_block_index |
+ nir_metadata_dominance;
+
+ nir_foreach_function(function, shader) {
+ if (function->impl) {
+ nir_builder builder;
+ b = &builder;
+ nir_builder_init(b, function->impl);
+ nir_foreach_block(block, function->impl) {
+ nir_foreach_instr_safe(instr, block) {
+ if (!filter(instr))
+ continue;
+
+ nir_ssa_def *old_def = nir_instr_ssa_def(instr);
+ struct list_head old_uses, old_if_uses;
+ if (old_def != nullptr) {
+ list_replace(&old_def->uses, &old_uses);
+ list_inithead(&old_def->uses);
+ list_replace(&old_def->if_uses, &old_if_uses);
+ list_inithead(&old_def->if_uses);
+ }
+
+ b->cursor = nir_after_instr(instr);
+ nir_ssa_def *new_def = lower(instr);
+ if (new_def && new_def != progress_keep &&
+ new_def != progress_replace) {
+ assert(old_def != NULL);
+ if (new_def->parent_instr->block != instr->block)
+ preserved = nir_metadata_none;
+
+ nir_src new_src = nir_src_for_ssa(new_def);
+ list_for_each_entry_safe(nir_src, use_src, &old_uses, use_link)
+ nir_instr_rewrite_src(use_src->parent_instr, use_src, new_src);
+
+ list_for_each_entry_safe(nir_src, use_src, &old_if_uses, use_link)
+ nir_if_rewrite_condition(use_src->parent_if, new_src);
+
+ if (list_is_empty(&old_def->uses) &&
+ list_is_empty(&old_def->if_uses)) {
+ nir_instr_remove(instr);
+ }
+ progress = true;
+ } else {
+ /* We didn't end up lowering after all. Put the uses back */
+ if (old_def) {
+ list_replace(&old_uses, &old_def->uses);
+ list_replace(&old_if_uses, &old_def->if_uses);
+ }
+ if (new_def == progress_replace) {
+ /* Only instructions without a return value can be removed like this */
+ assert(!old_def);
+ nir_instr_remove(instr);
+ progress = true;
+ }
+
+ if (new_def == progress_keep)
+ progress = true;
+ }
+ }
+
+ if (progress) {
+ nir_metadata_preserve(function->impl, preserved);
+ } else {
+ nir_metadata_preserve(function->impl, nir_metadata_all);
+ }
+ }
+ }
+ }
+ return progress;
+}
+
+nir_ssa_def *NirLowerInstruction::progress_keep = (nir_ssa_def *)1;
+nir_ssa_def *NirLowerInstruction::progress_replace = (nir_ssa_def *)2;
+
+
+bool NirLowerInstruction::run(nir_instr *instr)
+{
+ bool progress = false;
+ if (filter(instr)) {
+ progress = lower(instr);
+ }
+ return progress;
+}
+
+
ShaderFromNir::ShaderFromNir():sh(nullptr),
chip_class(CLASS_UNKNOWN),
m_current_if_id(0),
diff --git a/src/gallium/drivers/r600/sfn/sfn_nir.h b/src/gallium/drivers/r600/sfn/sfn_nir.h
index 2b6f19fe58d..f3209109319 100644
--- a/src/gallium/drivers/r600/sfn/sfn_nir.h
+++ b/src/gallium/drivers/r600/sfn/sfn_nir.h
@@ -36,6 +36,24 @@
namespace r600 {
+class NirLowerInstruction {
+public:
+ NirLowerInstruction();
+
+ bool run(nir_shader *shader);
+
+private:
+ bool run(nir_instr *instr);
+
+ virtual bool filter(const nir_instr *instr) const = 0;
+ virtual nir_ssa_def *lower(nir_instr *instr) = 0;
+protected:
+ nir_builder *b;
+
+ static nir_ssa_def *progress_keep;
+ static nir_ssa_def *progress_replace;
+};
+
bool r600_nir_lower_pack_unpack_2x16(nir_shader *shader);
bool r600_lower_scratch_addresses(nir_shader *shader);
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