From: Tom Stellard Date: Sun, 4 Jul 2010 19:30:52 +0000 (-0700) Subject: r300/compiler: Fix scheduling of TEX instructions. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3724a2e65f5b3aa6e123889342a3e9c4d05903f5;p=mesa.git r300/compiler: Fix scheduling of TEX instructions. The following instruction sequence will no longer be emitted in separate TEX blocks: 0: TEX temp[0].xyz, temp[1].xy__, 2D[0]; 1: TEX temp[1].xyz, temp[2].xy__, 2D[0]; This fixes fdo bug #25109 --- diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_pair_schedule.c b/src/mesa/drivers/dri/r300/compiler/radeon_pair_schedule.c index a279549ff89..fc540496c41 100644 --- a/src/mesa/drivers/dri/r300/compiler/radeon_pair_schedule.c +++ b/src/mesa/drivers/dri/r300/compiler/radeon_pair_schedule.c @@ -141,12 +141,28 @@ static void add_inst_to_list(struct schedule_instruction ** list, struct schedul *list = inst; } +static void add_inst_to_list_end(struct schedule_instruction ** list, + struct schedule_instruction * inst) +{ + if(!*list){ + *list = inst; + }else{ + struct schedule_instruction * temp = *list; + while(temp->NextReady){ + temp = temp->NextReady; + } + temp->NextReady = inst; + } +} + static void instruction_ready(struct schedule_state * s, struct schedule_instruction * sinst) { DBG("%i is now ready\n", sinst->Instruction->IP); + /* Adding Ready TEX instructions to the end of the "Ready List" helps + * us emit TEX instructions in blocks without losing our place. */ if (sinst->Instruction->Type == RC_INSTRUCTION_NORMAL) - add_inst_to_list(&s->ReadyTEX, sinst); + add_inst_to_list_end(&s->ReadyTEX, sinst); else if (sinst->Instruction->U.P.Alpha.Opcode == RC_OPCODE_NOP) add_inst_to_list(&s->ReadyRGB, sinst); else if (sinst->Instruction->U.P.RGB.Opcode == RC_OPCODE_NOP) @@ -163,11 +179,14 @@ static void decrease_dependencies(struct schedule_state * s, struct schedule_ins instruction_ready(s, sinst); } -static void commit_instruction(struct schedule_state * s, struct schedule_instruction * sinst) -{ - DBG("%i: commit\n", sinst->Instruction->IP); - - for(unsigned int i = 0; i < sinst->NumReadValues; ++i) { +/** + * This function decreases the dependencies of the next instruction that + * wants to write to each of sinst's read values. + */ +static void commit_update_reads(struct schedule_state * s, + struct schedule_instruction * sinst){ + unsigned int i; + for(i = 0; i < sinst->NumReadValues; ++i) { struct reg_value * v = sinst->ReadValues[i]; assert(v->NumReaders > 0); v->NumReaders--; @@ -176,8 +195,12 @@ static void commit_instruction(struct schedule_state * s, struct schedule_instru decrease_dependencies(s, v->Next->Writer); } } +} - for(unsigned int i = 0; i < sinst->NumWriteValues; ++i) { +static void commit_update_writes(struct schedule_state * s, + struct schedule_instruction * sinst){ + unsigned int i; + for(i = 0; i < sinst->NumWriteValues; ++i) { struct reg_value * v = sinst->WriteValues[i]; if (v->NumReaders) { for(struct reg_value_reader * r = v->Readers; r; r = r->Next) { @@ -196,6 +219,15 @@ static void commit_instruction(struct schedule_state * s, struct schedule_instru } } +static void commit_alu_instruction(struct schedule_state * s, struct schedule_instruction * sinst) +{ + DBG("%i: commit\n", sinst->Instruction->IP); + + commit_update_reads(s, sinst); + + commit_update_writes(s, sinst); +} + /** * Emit all ready texture instructions in a single block. * @@ -208,21 +240,37 @@ static void emit_all_tex(struct schedule_state * s, struct rc_instruction * befo assert(s->ReadyTEX); - /* Don't let the ready list change under us! */ - readytex = s->ReadyTEX; - s->ReadyTEX = 0; - /* Node marker for R300 */ struct rc_instruction * inst_begin = rc_insert_new_instruction(s->C, before->Prev); inst_begin->U.I.Opcode = RC_OPCODE_BEGIN_TEX; /* Link texture instructions back in */ + readytex = s->ReadyTEX; while(readytex) { - struct schedule_instruction * tex = readytex; + rc_insert_instruction(before->Prev, readytex->Instruction); + DBG("%i: commit TEX reads\n", readytex->Instruction->IP); + + /* All of the TEX instructions in the same TEX block have + * their source registers read from before any of the + * instructions in that block write to their destination + * registers. This means that when we commit a TEX + * instruction, any other TEX instruction that wants to write + * to one of the committed instruction's source register can be + * marked as ready and should be emitted in the same TEX + * block. This prevents the following sequence from being + * emitted in two different TEX blocks: + * 0: TEX temp[0].xyz, temp[1].xy__, 2D[0]; + * 1: TEX temp[1].xyz, temp[2].xy__, 2D[0]; + */ + commit_update_reads(s, readytex); + readytex = readytex->NextReady; + } + readytex = s->ReadyTEX; + s->ReadyTEX = 0; + while(readytex){ + DBG("%i: commit TEX writes\n", readytex->Instruction->IP); + commit_update_writes(s, readytex); readytex = readytex->NextReady; - - rc_insert_instruction(before->Prev, tex->Instruction); - commit_instruction(s, tex); } } @@ -328,7 +376,7 @@ static void emit_one_alu(struct schedule_state *s, struct rc_instruction * befor } rc_insert_instruction(before->Prev, sinst->Instruction); - commit_instruction(s, sinst); + commit_alu_instruction(s, sinst); } else { struct schedule_instruction **prgb; struct schedule_instruction **palpha; @@ -346,8 +394,8 @@ static void emit_one_alu(struct schedule_state *s, struct rc_instruction * befor *prgb = (*prgb)->NextReady; *palpha = (*palpha)->NextReady; rc_insert_instruction(before->Prev, psirgb->Instruction); - commit_instruction(s, psirgb); - commit_instruction(s, psialpha); + commit_alu_instruction(s, psirgb); + commit_alu_instruction(s, psialpha); goto success; } } @@ -357,7 +405,7 @@ static void emit_one_alu(struct schedule_state *s, struct rc_instruction * befor s->ReadyRGB = s->ReadyRGB->NextReady; rc_insert_instruction(before->Prev, sinst->Instruction); - commit_instruction(s, sinst); + commit_alu_instruction(s, sinst); success: ; } }