/**
* Find a good ALU instruction or pair of ALU instruction and emit it.
*
* Prefer emitting full ALU instructions, so that when we reach a point
* where no full ALU instruction can be emitted, we have more candidates
* for RGB/Alpha pairing.
*/
static void emit_one_alu(struct schedule_state *s, struct rc_instruction * before)
{
struct schedule_instruction * sinst;
if (s->ReadyFullALU || !(s->ReadyRGB && s->ReadyAlpha)) {
if (s->ReadyFullALU) {
sinst = s->ReadyFullALU;
s->ReadyFullALU = s->ReadyFullALU->NextReady;
} else if (s->ReadyRGB) {
sinst = s->ReadyRGB;
s->ReadyRGB = s->ReadyRGB->NextReady;
} else {
sinst = s->ReadyAlpha;
s->ReadyAlpha = s->ReadyAlpha->NextReady;
}
rc_insert_instruction(before->Prev, sinst->Instruction);
commit_alu_instruction(s, sinst);
} else {
struct schedule_instruction **prgb;
struct schedule_instruction **palpha;
/* Some pairings might fail because they require too
* many source slots; try all possible pairings if necessary */
for(prgb = &s->ReadyRGB; *prgb; prgb = &(*prgb)->NextReady) {
for(palpha = &s->ReadyAlpha; *palpha; palpha = &(*palpha)->NextReady) {
struct schedule_instruction * psirgb = *prgb;
struct schedule_instruction * psialpha = *palpha;
if (!merge_instructions(&psirgb->Instruction->U.P, &psialpha->Instruction->U.P))
continue;
*prgb = (*prgb)->NextReady;
*palpha = (*palpha)->NextReady;
rc_insert_instruction(before->Prev, psirgb->Instruction);
commit_alu_instruction(s, psirgb);
commit_alu_instruction(s, psialpha);
goto success;
}
}
/* No success in pairing; just take the first RGB instruction */
sinst = s->ReadyRGB;
s->ReadyRGB = s->ReadyRGB->NextReady;
rc_insert_instruction(before->Prev, sinst->Instruction);
commit_alu_instruction(s, sinst);
success: ;
}
/* If the instruction we just emitted uses a presubtract value, and
* the presubtract sources were written by the previous intstruction,
* the previous instruction needs a nop. */
presub_nop(before->Prev);
}
static void emit_instruction(
struct schedule_state * s,
struct rc_instruction * before)
{
int max_score = -1;
struct schedule_instruction * max_inst = NULL;
struct schedule_instruction ** max_list = NULL;
unsigned tex_count = 0;
struct schedule_instruction * tex_ptr;
pair_instructions(s);
#if VERBOSE
fprintf(stderr, "Full:\n");
print_list(s->ReadyFullALU);
fprintf(stderr, "RGB:\n");
print_list(s->ReadyRGB);
fprintf(stderr, "Alpha:\n");
print_list(s->ReadyAlpha);
fprintf(stderr, "TEX:\n");
print_list(s->ReadyTEX);
#endif
for (tex_ptr = s->ReadyTEX; tex_ptr; tex_ptr = tex_ptr->NextReady) {
if (tex_ptr->Instruction->U.I.Opcode == RC_OPCODE_KIL) {
emit_all_tex(s, before);
return;
}
tex_count++;
}
update_max_score(s, &s->ReadyFullALU, &max_score, &max_inst, &max_list);
update_max_score(s, &s->ReadyRGB, &max_score, &max_inst, &max_list);
update_max_score(s, &s->ReadyAlpha, &max_score, &max_inst, &max_list);
if (tex_count >= s->max_tex_group || max_score == -1
|| (s->TEXCount > 0 && tex_count == s->TEXCount)
|| (!s->C->is_r500 && tex_count > 0 && max_score == -1)) {
emit_all_tex(s, before);
} else {
remove_inst_from_list(max_list, max_inst);
rc_insert_instruction(before->Prev, max_inst->Instruction);
commit_alu_instruction(s, max_inst);
presub_nop(before->Prev);
}
}
/**
* Find a good ALU instruction or pair of ALU instruction and emit it.
*
* Prefer emitting full ALU instructions, so that when we reach a point
* where no full ALU instruction can be emitted, we have more candidates
* for RGB/Alpha pairing.
*/
static void emit_one_alu(struct schedule_state *s, struct rc_instruction * before)
{
struct schedule_instruction * sinst;
if (s->ReadyFullALU) {
sinst = s->ReadyFullALU;
s->ReadyFullALU = s->ReadyFullALU->NextReady;
rc_insert_instruction(before->Prev, sinst->Instruction);
commit_alu_instruction(s, sinst);
} else {
struct schedule_instruction **prgb;
struct schedule_instruction **palpha;
struct schedule_instruction *prev;
pair:
/* Some pairings might fail because they require too
* many source slots; try all possible pairings if necessary */
for(prgb = &s->ReadyRGB; *prgb; prgb = &(*prgb)->NextReady) {
for(palpha = &s->ReadyAlpha; *palpha; palpha = &(*palpha)->NextReady) {
struct schedule_instruction * psirgb = *prgb;
struct schedule_instruction * psialpha = *palpha;
if (!merge_instructions(&psirgb->Instruction->U.P, &psialpha->Instruction->U.P))
continue;
*prgb = (*prgb)->NextReady;
*palpha = (*palpha)->NextReady;
rc_insert_instruction(before->Prev, psirgb->Instruction);
commit_alu_instruction(s, psirgb);
commit_alu_instruction(s, psialpha);
goto success;
}
}
prev = NULL;
/* No success in pairing, now try to convert one of the RGB
* instructions to an Alpha so we can pair it with another RGB.
*/
if (s->ReadyRGB && s->ReadyRGB->NextReady) {
for(prgb = &s->ReadyRGB; *prgb; prgb = &(*prgb)->NextReady) {
if ((*prgb)->NumWriteValues == 1) {
struct schedule_instruction * prgb_next;
if (!convert_rgb_to_alpha(s, *prgb))
goto cont_loop;
prgb_next = (*prgb)->NextReady;
/* Add instruction to the Alpha ready list. */
(*prgb)->NextReady = s->ReadyAlpha;
s->ReadyAlpha = *prgb;
/* Remove instruction from the RGB ready list.*/
if (prev)
prev->NextReady = prgb_next;
else
s->ReadyRGB = prgb_next;
goto pair;
}
cont_loop:
prev = *prgb;
}
}
/* Still no success in pairing, just take the first RGB
* or alpha instruction. */
if (s->ReadyRGB) {
sinst = s->ReadyRGB;
s->ReadyRGB = s->ReadyRGB->NextReady;
} else if (s->ReadyAlpha) {
sinst = s->ReadyAlpha;
s->ReadyAlpha = s->ReadyAlpha->NextReady;
} else {
/*XXX Something real bad has happened. */
assert(0);
}
rc_insert_instruction(before->Prev, sinst->Instruction);
commit_alu_instruction(s, sinst);
success: ;
}
/* If the instruction we just emitted uses a presubtract value, and
* the presubtract sources were written by the previous intstruction,
* the previous instruction needs a nop. */
presub_nop(before->Prev);
}
