aco: add new reindex_ssa() pass

Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9196>

src/amd/Makefile.sources

@@ -110,6 +110,7 @@ ACO_FILES = \
 	compiler/aco_opt_value_numbering.cpp \
 	compiler/aco_print_asm.cpp \
 	compiler/aco_print_ir.cpp \
+	compiler/aco_reindex_ssa.cpp \
 	compiler/aco_scheduler.cpp \
 	compiler/aco_ssa_elimination.cpp \
 	compiler/aco_spill.cpp \

src/amd/compiler/aco_ir.h

@@ -1928,6 +1928,9 @@ public:
       return allocationID;
    }
 
+   friend void reindex_ssa(Program* program);
+   friend void reindex_ssa(Program* program, std::vector<IDSet>& live_out);
+
    Block* create_and_insert_block() {
       Block block;
       return insert_block(std::move(block));

src/amd/compiler/aco_reindex_ssa.cpp

@@ -0,0 +1,123 @@
+/*
+ * Copyright © 2021 Valve Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include <aco_ir.h>
+
+namespace aco {
+namespace {
+
+struct idx_ctx {
+   std::vector<RegClass> temp_rc = {s1};
+   std::vector<uint32_t> renames;
+};
+
+inline
+void reindex_defs(idx_ctx& ctx, aco_ptr<Instruction>& instr)
+{
+   for (Definition& def : instr->definitions) {
+      if (!def.isTemp())
+         continue;
+      uint32_t new_id = ctx.temp_rc.size();
+      RegClass rc = def.regClass();
+      ctx.renames[def.tempId()] = new_id;
+      ctx.temp_rc.emplace_back(rc);
+      def.setTemp(Temp(new_id, rc));
+   }
+}
+
+inline
+void reindex_ops(idx_ctx& ctx, aco_ptr<Instruction>& instr)
+{
+   for (Operand& op : instr->operands) {
+      if (!op.isTemp())
+         continue;
+      uint32_t new_id = ctx.renames[op.tempId()];
+      assert(op.regClass() == ctx.temp_rc[new_id]);
+      op.setTemp(Temp(new_id, op.regClass()));
+   }
+}
+
+void reindex_program(idx_ctx& ctx, Program* program)
+{
+   ctx.renames.resize(program->peekAllocationId());
+
+   for (Block& block : program->blocks) {
+      auto it = block.instructions.begin();
+      /* for phis, only reindex the definitions */
+      while (is_phi(*it)) {
+         reindex_defs(ctx, *it++);
+      }
+      /* reindex all other instructions */
+      while (it != block.instructions.end()) {
+         reindex_defs(ctx, *it);
+         reindex_ops(ctx, *it);
+         ++it;
+      }
+   }
+   /* update the phi operands */
+   for (Block& block : program->blocks) {
+      auto it = block.instructions.begin();
+      while (is_phi(*it)) {
+         reindex_ops(ctx, *it++);
+      }
+   }
+
+   /* update program members */
+   program->private_segment_buffer = Temp(ctx.renames[program->private_segment_buffer.id()],
+                                          program->private_segment_buffer.regClass());
+   program->scratch_offset = Temp(ctx.renames[program->scratch_offset.id()],
+                                  program->scratch_offset.regClass());
+   program->temp_rc = ctx.temp_rc;
+}
+
+void update_live_out(idx_ctx& ctx, std::vector<IDSet>& live_out)
+{
+   for (IDSet& set : live_out) {
+      IDSet new_set;
+      for (uint32_t id : set)
+         new_set.insert(ctx.renames[id]);
+      set = new_set;
+   }
+}
+
+} /* end namespace */
+
+void reindex_ssa(Program* program)
+{
+   idx_ctx ctx;
+   reindex_program(ctx, program);
+
+   program->allocationID = program->temp_rc.size();
+}
+
+void reindex_ssa(Program* program, std::vector<IDSet>& live_out)
+{
+   idx_ctx ctx;
+   reindex_program(ctx, program);
+   update_live_out(ctx, live_out);
+
+   program->allocationID = program->temp_rc.size();
+}
+
+}

src/amd/compiler/meson.build

@@ -78,6 +78,7 @@ libaco_files = files(
   'aco_opt_value_numbering.cpp',
   'aco_print_asm.cpp',
   'aco_print_ir.cpp',
+  'aco_reindex_ssa.cpp',
   'aco_scheduler.cpp',
   'aco_spill.cpp',
   'aco_ssa_elimination.cpp',