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  1. /*
  2.  * Copyright (C) 2010 Marek Olšák <maraeo@gmail.com>
  3.  *
  4.  * All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining
  7.  * a copy of this software and associated documentation files (the
  8.  * "Software"), to deal in the Software without restriction, including
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sublicense, and/or sell copies of the Software, and to
  11.  * permit persons to whom the Software is furnished to do so, subject to
  12.  * the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice (including the
  15.  * next paragraph) shall be included in all copies or substantial
  16.  * portions of the Software.
  17.  *
  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19.  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21.  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22.  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23.  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24.  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  *
  26.  */
  27.  
  28. #include "radeon_remove_constants.h"
  29. #include "radeon_dataflow.h"
  30.  
  31. struct mark_used_data {
  32.         unsigned char * const_used;
  33.         unsigned * has_rel_addr;
  34. };
  35.  
  36. static void remap_regs(void * userdata, struct rc_instruction * inst,
  37.                         rc_register_file * pfile, unsigned int * pindex)
  38. {
  39.         unsigned *inv_remap_table = userdata;
  40.  
  41.         if (*pfile == RC_FILE_CONSTANT) {
  42.                 *pindex = inv_remap_table[*pindex];
  43.         }
  44. }
  45.  
  46. static void mark_used(void * userdata, struct rc_instruction * inst,
  47.                                                 struct rc_src_register * src)
  48. {
  49.         struct mark_used_data * d = userdata;
  50.  
  51.         if (src->File == RC_FILE_CONSTANT) {
  52.                 if (src->RelAddr) {
  53.                         *d->has_rel_addr = 1;
  54.                 } else {
  55.                         d->const_used[src->Index] = 1;
  56.                 }
  57.         }
  58. }
  59.  
  60. void rc_remove_unused_constants(struct radeon_compiler *c, void *user)
  61. {
  62.         unsigned **out_remap_table = (unsigned**)user;
  63.         unsigned char *const_used;
  64.         unsigned *remap_table;
  65.         unsigned *inv_remap_table;
  66.         unsigned has_rel_addr = 0;
  67.         unsigned is_identity = 1;
  68.         unsigned are_externals_remapped = 0;
  69.         struct rc_constant *constants = c->Program.Constants.Constants;
  70.         struct mark_used_data d;
  71.         unsigned new_count;
  72.  
  73.         if (!c->Program.Constants.Count) {
  74.                 *out_remap_table = NULL;
  75.                 return;
  76.         }
  77.  
  78.         const_used = malloc(c->Program.Constants.Count);
  79.         memset(const_used, 0, c->Program.Constants.Count);
  80.  
  81.         d.const_used = const_used;
  82.         d.has_rel_addr = &has_rel_addr;
  83.  
  84.         /* Pass 1: Mark used constants. */
  85.         for (struct rc_instruction *inst = c->Program.Instructions.Next;
  86.              inst != &c->Program.Instructions; inst = inst->Next) {
  87.                 rc_for_all_reads_src(inst, mark_used, &d);
  88.         }
  89.  
  90.         /* Pass 2: If there is relative addressing or dead constant elimination
  91.          * is disabled, mark all externals as used. */
  92.         if (has_rel_addr || !c->remove_unused_constants) {
  93.                 for (unsigned i = 0; i < c->Program.Constants.Count; i++)
  94.                         if (constants[i].Type == RC_CONSTANT_EXTERNAL)
  95.                                 const_used[i] = 1;
  96.         }
  97.  
  98.         /* Pass 3: Make the remapping table and remap constants.
  99.          * This pass removes unused constants simply by overwriting them by other constants. */
  100.         remap_table = malloc(c->Program.Constants.Count * sizeof(unsigned));
  101.         inv_remap_table = malloc(c->Program.Constants.Count * sizeof(unsigned));
  102.         new_count = 0;
  103.  
  104.         for (unsigned i = 0; i < c->Program.Constants.Count; i++) {
  105.                 if (const_used[i]) {
  106.                         remap_table[new_count] = i;
  107.                         inv_remap_table[i] = new_count;
  108.  
  109.                         if (i != new_count) {
  110.                                 if (constants[i].Type == RC_CONSTANT_EXTERNAL)
  111.                                         are_externals_remapped = 1;
  112.  
  113.                                 constants[new_count] = constants[i];
  114.                                 is_identity = 0;
  115.                         }
  116.                         new_count++;
  117.                 }
  118.         }
  119.  
  120.         /*  is_identity ==> new_count == old_count
  121.          * !is_identity ==> new_count <  old_count */
  122.         assert( is_identity || new_count <  c->Program.Constants.Count);
  123.         assert(!((has_rel_addr || !c->remove_unused_constants) && are_externals_remapped));
  124.  
  125.         /* Pass 4: Redirect reads of all constants to their new locations. */
  126.         if (!is_identity) {
  127.                 for (struct rc_instruction *inst = c->Program.Instructions.Next;
  128.                      inst != &c->Program.Instructions; inst = inst->Next) {
  129.                         rc_remap_registers(inst, remap_regs, inv_remap_table);
  130.                 }
  131.         }
  132.  
  133.         /* Set the new constant count. Note that new_count may be less than
  134.          * Count even though the remapping function is identity. In that case,
  135.          * the constants have been removed at the end of the array. */
  136.         c->Program.Constants.Count = new_count;
  137.  
  138.         if (are_externals_remapped) {
  139.                 *out_remap_table = remap_table;
  140.         } else {
  141.                 *out_remap_table = NULL;
  142.                 free(remap_table);
  143.         }
  144.  
  145.         free(const_used);
  146.         free(inv_remap_table);
  147.  
  148.         if (c->Debug & RC_DBG_LOG)
  149.                 rc_constants_print(&c->Program.Constants);
  150. }
  151.