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  1. /*
  2.  * Copyright 2011 Tom Stellard <tstellar@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_compiler.h"
  29. #include "radeon_compiler_util.h"
  30. #include "radeon_opcodes.h"
  31. #include "radeon_program_pair.h"
  32.  
  33. static void mark_used_presub(struct rc_pair_sub_instruction * sub)
  34. {
  35.         if (sub->Src[RC_PAIR_PRESUB_SRC].Used) {
  36.                 unsigned int presub_reg_count = rc_presubtract_src_reg_count(
  37.                                         sub->Src[RC_PAIR_PRESUB_SRC].Index);
  38.                 unsigned int i;
  39.                 for (i = 0; i < presub_reg_count; i++) {
  40.                         sub->Src[i].Used = 1;
  41.                 }
  42.         }
  43. }
  44.  
  45. static void mark_used(
  46.         struct rc_instruction * inst,
  47.         struct rc_pair_sub_instruction * sub)
  48. {
  49.         unsigned int i;
  50.         const struct rc_opcode_info * info = rc_get_opcode_info(sub->Opcode);
  51.         for (i = 0; i < info->NumSrcRegs; i++) {
  52.                 unsigned int src_type = rc_source_type_swz(sub->Arg[i].Swizzle);
  53.                 if (src_type & RC_SOURCE_RGB) {
  54.                         inst->U.P.RGB.Src[sub->Arg[i].Source].Used = 1;
  55.                 }
  56.  
  57.                 if (src_type & RC_SOURCE_ALPHA) {
  58.                         inst->U.P.Alpha.Src[sub->Arg[i].Source].Used = 1;
  59.                 }
  60.         }
  61. }
  62.  
  63. /**
  64.  * This pass finds sources that are not used by their instruction and marks
  65.  * them as unused.
  66.  */
  67. void rc_pair_remove_dead_sources(struct radeon_compiler * c, void *user)
  68. {
  69.         struct rc_instruction * inst;
  70.         for (inst = c->Program.Instructions.Next;
  71.                                         inst != &c->Program.Instructions;
  72.                                         inst = inst->Next) {
  73.                 unsigned int i;
  74.                 if (inst->Type == RC_INSTRUCTION_NORMAL)
  75.                         continue;
  76.  
  77.                 /* Mark all sources as unused */
  78.                 for (i = 0; i < 4; i++) {
  79.                         inst->U.P.RGB.Src[i].Used = 0;
  80.                         inst->U.P.Alpha.Src[i].Used = 0;
  81.                 }
  82.                 mark_used(inst, &inst->U.P.RGB);
  83.                 mark_used(inst, &inst->U.P.Alpha);
  84.  
  85.                 mark_used_presub(&inst->U.P.RGB);
  86.                 mark_used_presub(&inst->U.P.Alpha);
  87.         }
  88. }
  89.