struct ir3_legalize_state prev_state = bd->state;
struct ir3_legalize_state *state = &bd->state;
bool last_input_needs_ss = false;
+ bool has_tex_prefetch = false;
/* our input state is the OR of all predecessor blocks' state: */
- for (unsigned i = 0; i < block->predecessors_count; i++) {
- struct ir3_legalize_block_data *pbd = block->predecessors[i]->data;
+ set_foreach(block->predecessors, entry) {
+ struct ir3_block *predecessor = (struct ir3_block *)entry->key;
+ struct ir3_legalize_block_data *pbd = predecessor->data;
struct ir3_legalize_state *pstate = &pbd->state;
/* Our input (ss)/(sy) state is based on OR'ing the output
n->flags &= ~(IR3_INSTR_SS | IR3_INSTR_SY);
- if (is_meta(n))
+ /* _meta::tex_prefetch instructions removed later in
+ * collect_tex_prefetches()
+ */
+ if (is_meta(n) && (n->opc != OPC_META_TEX_PREFETCH))
continue;
if (is_input(n)) {
if (is_sfu(n))
regmask_set(&state->needs_ss, n->regs[0]);
- if (is_tex(n)) {
+ if (is_tex(n) || (n->opc == OPC_META_TEX_PREFETCH)) {
regmask_set(&state->needs_sy, n->regs[0]);
ctx->need_pixlod = true;
+ if (n->opc == OPC_META_TEX_PREFETCH)
+ has_tex_prefetch = true;
} else if (n->opc == OPC_RESINFO) {
regmask_set(&state->needs_ss, n->regs[0]);
ir3_NOP(block)->flags |= IR3_INSTR_SS;
/* seems like ldlv needs (ss) bit instead?? which is odd but
* makes a bunch of flat-varying tests start working on a4xx.
*/
- if ((n->opc == OPC_LDLV) || (n->opc == OPC_LDL))
+ if ((n->opc == OPC_LDLV) || (n->opc == OPC_LDL) || (n->opc == OPC_LDLW))
regmask_set(&state->needs_ss, n->regs[0]);
else
regmask_set(&state->needs_sy, n->regs[0]);
last_input->regs[0]->flags |= IR3_REG_EI;
if (last_input_needs_ss)
last_input->flags |= IR3_INSTR_SS;
+ } else if (has_tex_prefetch) {
+ /* texture prefetch, but *no* inputs.. we need to insert a
+ * dummy bary.f at the top of the shader to unblock varying
+ * storage:
+ */
+ struct ir3_instruction *baryf;
+
+ /* (ss)bary.f (ei)r63.x, 0, r0.x */
+ baryf = ir3_instr_create(block, OPC_BARY_F);
+ ir3_reg_create(baryf, regid(63, 0), 0)->flags |= IR3_REG_EI;
+ ir3_reg_create(baryf, 0, IR3_REG_IMMED)->iim_val = 0;
+ ir3_reg_create(baryf, regid(0, 0), 0);
+
+ /* insert the dummy bary.f at head: */
+ list_delinit(&baryf->node);
+ list_add(&baryf->node, &block->instr_list);
}
if (last_rel)
return block;
}
+static void
+remove_unused_block(struct ir3_block *old_target)
+{
+ list_delinit(&old_target->node);
+
+ /* cleanup dangling predecessors: */
+ for (unsigned i = 0; i < ARRAY_SIZE(old_target->successors); i++) {
+ if (old_target->successors[i]) {
+ struct ir3_block *succ = old_target->successors[i];
+ _mesa_set_remove_key(succ->predecessors, old_target);
+ }
+ }
+}
+
+static void
+retarget_jump(struct ir3_instruction *instr, struct ir3_block *new_target)
+{
+ struct ir3_block *old_target = instr->cat0.target;
+ struct ir3_block *cur_block = instr->block;
+
+ /* update current blocks successors to reflect the retargetting: */
+ if (cur_block->successors[0] == old_target) {
+ cur_block->successors[0] = new_target;
+ } else {
+ debug_assert(cur_block->successors[1] == old_target);
+ cur_block->successors[1] = new_target;
+ }
+
+ /* update new target's predecessors: */
+ _mesa_set_add(new_target->predecessors, cur_block);
+
+ /* and remove old_target's predecessor: */
+ debug_assert(_mesa_set_search(old_target->predecessors, cur_block));
+ _mesa_set_remove_key(old_target->predecessors, cur_block);
+
+ if (old_target->predecessors->entries == 0)
+ remove_unused_block(old_target);
+
+ instr->cat0.target = new_target;
+}
+
static bool
resolve_jump(struct ir3_instruction *instr)
{
struct ir3_instruction *target;
if (tblock != instr->cat0.target) {
- list_delinit(&instr->cat0.target->node);
- instr->cat0.target = tblock;
+ retarget_jump(instr, tblock);
return true;
}
else
next_block = 1;
- if ((!target) || (target->ip == (instr->ip + next_block))) {
+ if (target->ip == (instr->ip + next_block)) {
list_delinit(&instr->node);
return true;
} else {
return false;
}
-/* we want to mark points where divergent flow control re-converges
- * with (jp) flags. For now, since we don't do any optimization for
- * things that start out as a 'do {} while()', re-convergence points
- * will always be a branch or jump target. Note that this is overly
- * conservative, since unconditional jump targets are not convergence
- * points, we are just assuming that the other path to reach the jump
- * target was divergent. If we were clever enough to optimize the
- * jump at end of a loop back to a conditional branch into a single
- * conditional branch, ie. like:
- *
- * add.f r1.w, r0.x, (neg)(r)c2.x <= loop start
- * mul.f r1.z, r1.z, r0.x
- * mul.f r1.y, r1.y, r0.x
- * mul.f r0.z, r1.x, r0.x
- * mul.f r0.w, r0.y, r0.x
- * cmps.f.ge r0.x, (r)c2.y, (r)r1.w
- * add.s r0.x, (r)r0.x, (r)-1
- * sel.f32 r0.x, (r)c3.y, (r)r0.x, c3.x
- * cmps.f.eq p0.x, r0.x, c3.y
- * mov.f32f32 r0.x, r1.w
- * mov.f32f32 r0.y, r0.w
- * mov.f32f32 r1.x, r0.z
- * (rpt2)nop
- * br !p0.x, #-13
- * (jp)mul.f r0.x, c263.y, r1.y
+static void mark_jp(struct ir3_block *block)
+{
+ struct ir3_instruction *target = list_first_entry(&block->instr_list,
+ struct ir3_instruction, node);
+ target->flags |= IR3_INSTR_JP;
+}
+
+/* Mark points where control flow converges or diverges.
*
- * Then we'd have to be more clever, as the convergence point is no
- * longer a branch or jump target.
+ * Divergence points could actually be re-convergence points where
+ * "parked" threads are recoverged with threads that took the opposite
+ * path last time around. Possibly it is easier to think of (jp) as
+ * "the execution mask might have changed".
*/
static void
-mark_convergence_points(struct ir3 *ir)
+mark_xvergence_points(struct ir3 *ir)
{
list_for_each_entry (struct ir3_block, block, &ir->block_list, node) {
- list_for_each_entry (struct ir3_instruction, instr, &block->instr_list, node) {
- if (is_flow(instr) && instr->cat0.target) {
- struct ir3_instruction *target =
- list_first_entry(&instr->cat0.target->instr_list,
- struct ir3_instruction, node);
- target->flags |= IR3_INSTR_JP;
+ if (block->predecessors->entries > 1) {
+ /* if a block has more than one possible predecessor, then
+ * the first instruction is a convergence point.
+ */
+ mark_jp(block);
+ } else if (block->predecessors->entries == 1) {
+ /* If a block has one predecessor, which has multiple possible
+ * successors, it is a divergence point.
+ */
+ set_foreach(block->predecessors, entry) {
+ struct ir3_block *predecessor = (struct ir3_block *)entry->key;
+ if (predecessor->successors[1]) {
+ mark_jp(block);
+ }
}
}
}
ir3_count_instructions(ir);
} while(resolve_jumps(ir));
- mark_convergence_points(ir);
+ mark_xvergence_points(ir);
ralloc_free(ctx);
}
projects / mesa.git / blobdiff