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      1 /*
      2  * Copyright 2011 Tom Stellard <tstellar (at) 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