--- /dev/null
+/*
+ * Copyright (C) 2010 Marek Olšák <maraeo@gmail.com>
+ *
+ * All Rights Reserved.
+ *
+ * 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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 "radeon_remove_constants.h"
+
+void rc_remove_unused_constants(struct radeon_compiler *c,
+ unsigned **out_remap_table)
+{
+ unsigned char *const_used;
+ unsigned *remap_table;
+ unsigned *inv_remap_table;
+ unsigned has_rel_addr = 0;
+ unsigned is_identity = 1;
+ unsigned are_externals_remapped = 0;
+ struct rc_constant *constants = c->Program.Constants.Constants;
+
+ if (!c->Program.Constants.Count) {
+ *out_remap_table = NULL;
+ return;
+ }
+
+ const_used = malloc(c->Program.Constants.Count);
+ memset(const_used, 0, c->Program.Constants.Count);
+
+ /* Pass 1: Mark used constants. */
+ for (struct rc_instruction *inst = c->Program.Instructions.Next;
+ inst != &c->Program.Instructions; inst = inst->Next) {
+ const struct rc_opcode_info *opcode = rc_get_opcode_info(inst->U.I.Opcode);
+
+ for (unsigned i = 0; i < opcode->NumSrcRegs; i++) {
+ if (inst->U.I.SrcReg[i].File == RC_FILE_CONSTANT) {
+ if (inst->U.I.SrcReg[i].RelAddr) {
+ has_rel_addr = 1;
+ } else {
+ const_used[inst->U.I.SrcReg[i].Index] = 1;
+ }
+ }
+ }
+ }
+
+ /* Pass 2: If there is relative addressing, mark all externals as used. */
+ if (has_rel_addr) {
+ for (unsigned i = 0; i < c->Program.Constants.Count; i++)
+ if (constants[i].Type == RC_CONSTANT_EXTERNAL)
+ const_used[i] = 1;
+ }
+
+ /* Pass 3: Make the remapping table and remap constants.
+ * This pass removes unused constants simply by overwriting them by other constants. */
+ remap_table = malloc(c->Program.Constants.Count * sizeof(unsigned));
+ inv_remap_table = malloc(c->Program.Constants.Count * sizeof(unsigned));
+ unsigned new_count = 0;
+
+ for (unsigned i = 0; i < c->Program.Constants.Count; i++) {
+ if (const_used[i]) {
+ remap_table[new_count] = i;
+ inv_remap_table[i] = new_count;
+
+ if (i != new_count) {
+ if (constants[i].Type == RC_CONSTANT_EXTERNAL)
+ are_externals_remapped = 1;
+
+ constants[new_count] = constants[i];
+ is_identity = 0;
+ }
+ new_count++;
+ }
+ }
+
+ /* is_identity ==> new_count == old_count
+ * !is_identity ==> new_count < old_count */
+ assert( is_identity || new_count < c->Program.Constants.Count);
+ assert(!(has_rel_addr && are_externals_remapped));
+
+ /* Pass 4: Redirect reads of all constants to their new locations. */
+ if (!is_identity) {
+ for (struct rc_instruction *inst = c->Program.Instructions.Next;
+ inst != &c->Program.Instructions; inst = inst->Next) {
+ const struct rc_opcode_info *opcode = rc_get_opcode_info(inst->U.I.Opcode);
+
+ for (unsigned i = 0; i < opcode->NumSrcRegs; i++) {
+ if (inst->U.I.SrcReg[i].File == RC_FILE_CONSTANT) {
+ inst->U.I.SrcReg[i].Index = inv_remap_table[inst->U.I.SrcReg[i].Index];
+ }
+ }
+ }
+
+ }
+
+ /* Set the new constant count. Note that new_count may be less than
+ * Count even though the remapping function is identity. In that case,
+ * the constants have been removed at the end of the array. */
+ c->Program.Constants.Count = new_count;
+
+ if (are_externals_remapped) {
+ *out_remap_table = remap_table;
+ } else {
+ *out_remap_table = NULL;
+ free(remap_table);
+ }
+
+ free(const_used);
+ free(inv_remap_table);
+}
--- /dev/null
+/*
+ * Copyright (C) 2010 Marek Olšák <maraeo@gmail.com>
+ *
+ * All Rights Reserved.
+ *
+ * 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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.
+ *
+ */
+
+#ifndef RADEON_REMOVE_CONSTANTS_H
+#define RADEON_REMOVE_CONSTANTS_H
+
+#include "radeon_compiler.h"
+
+void rc_remove_unused_constants(struct radeon_compiler *c,
+ unsigned **out_remap_table);
+
+#endif
projects / mesa.git / commitdiff