1 /* 2 * Copyright 2011 Tom Stellard <tstellar@gmail.com> 3 * SPDX-License-Identifier: MIT 4 */ 5 6 #include "radeon_compiler.h" 7 #include "radeon_compiler_util.h" 8 #include "radeon_opcodes.h" 9 #include "radeon_program_pair.h" 10 11 static void mark_used_presub(struct rc_pair_sub_instruction * sub)12mark_used_presub(struct rc_pair_sub_instruction *sub) 13 { 14 if (sub->Src[RC_PAIR_PRESUB_SRC].Used) { 15 unsigned int presub_reg_count = 16 rc_presubtract_src_reg_count(sub->Src[RC_PAIR_PRESUB_SRC].Index); 17 unsigned int i; 18 for (i = 0; i < presub_reg_count; i++) { 19 sub->Src[i].Used = 1; 20 } 21 } 22 } 23 24 static void mark_used(struct rc_instruction * inst,struct rc_pair_sub_instruction * sub)25mark_used(struct rc_instruction *inst, struct rc_pair_sub_instruction *sub) 26 { 27 unsigned int i; 28 const struct rc_opcode_info *info = rc_get_opcode_info(sub->Opcode); 29 for (i = 0; i < info->NumSrcRegs; i++) { 30 unsigned int src_type = rc_source_type_swz(sub->Arg[i].Swizzle); 31 if (src_type & RC_SOURCE_RGB) { 32 inst->U.P.RGB.Src[sub->Arg[i].Source].Used = 1; 33 } 34 35 if (src_type & RC_SOURCE_ALPHA) { 36 inst->U.P.Alpha.Src[sub->Arg[i].Source].Used = 1; 37 } 38 } 39 } 40 41 /** 42 * This pass finds sources that are not used by their instruction and marks 43 * them as unused. 44 */ 45 void rc_pair_remove_dead_sources(struct radeon_compiler * c,void * user)46rc_pair_remove_dead_sources(struct radeon_compiler *c, void *user) 47 { 48 struct rc_instruction *inst; 49 for (inst = c->Program.Instructions.Next; inst != &c->Program.Instructions; inst = inst->Next) { 50 unsigned int i; 51 if (inst->Type == RC_INSTRUCTION_NORMAL) 52 continue; 53 54 /* Mark all sources as unused */ 55 for (i = 0; i < 4; i++) { 56 inst->U.P.RGB.Src[i].Used = 0; 57 inst->U.P.Alpha.Src[i].Used = 0; 58 } 59 mark_used(inst, &inst->U.P.RGB); 60 mark_used(inst, &inst->U.P.Alpha); 61 62 mark_used_presub(&inst->U.P.RGB); 63 mark_used_presub(&inst->U.P.Alpha); 64 } 65 } 66