src/gallium/drivers/r300/compiler/radeon_pair_dead_sources.c

   1
   2 #include "radeon_compiler.h"
   3 #include "radeon_compiler_util.h"
   4 #include "radeon_opcodes.h"
   5 #include "radeon_program_pair.h"
   6
   7 static void mark_used_presub(struct rc_pair_sub_instruction * sub)
   8 {
   9         if (sub->Src[RC_PAIR_PRESUB_SRC].Used) {
  10                 unsigned int presub_reg_count = rc_presubtract_src_reg_count(
  11                                         sub->Src[RC_PAIR_PRESUB_SRC].Index);
  12                 unsigned int i;
  13                 for (i = 0; i < presub_reg_count; i++) {
  14                         sub->Src[i].Used = 1;
  15                 }
  16         }
  17 }
  18
  19 static void mark_used(
  20         struct rc_instruction * inst,
  21         struct rc_pair_sub_instruction * sub)
  22 {
  23         unsigned int i;
  24         const struct rc_opcode_info * info = rc_get_opcode_info(sub->Opcode);
  25         for (i = 0; i < info->NumSrcRegs; i++) {
  26                 unsigned int src_type = rc_source_type_swz(sub->Arg[i].Swizzle);
  27                 if (src_type & RC_SOURCE_RGB) {
  28                         inst->U.P.RGB.Src[sub->Arg[i].Source].Used = 1;
  29                 }
  30
  31                 if (src_type & RC_SOURCE_ALPHA) {
  32                         inst->U.P.Alpha.Src[sub->Arg[i].Source].Used = 1;
  33                 }
  34         }
  35 }
  36
  37 /**
  38  * This pass finds sources that are not used by their instruction and marks
  39  * them as unused.
  40  */
  41 void rc_pair_remove_dead_sources(struct radeon_compiler * c, void *user)
  42 {
  43         struct rc_instruction * inst;
  44         for (inst = c->Program.Instructions.Next;
  45                                         inst != &c->Program.Instructions;
  46                                         inst = inst->Next) {
  47                 unsigned int i;
  48                 if (inst->Type == RC_INSTRUCTION_NORMAL)
  49                         continue;
  50
  51                 /* Mark all sources as unused */
  52                 for (i = 0; i < 4; i++) {
  53                         inst->U.P.RGB.Src[i].Used = 0;
  54                         inst->U.P.Alpha.Src[i].Used = 0;
  55                 }
  56                 mark_used(inst, &inst->U.P.RGB);
  57                 mark_used(inst, &inst->U.P.Alpha);
  58
  59                 mark_used_presub(&inst->U.P.RGB);
  60                 mark_used_presub(&inst->U.P.Alpha);
  61         }
  62 }