i965: Avoid generating MOVs for assignments of expressions.
No statistically significant difference measured in 3dbenchmark egypt/pro. It does reduce fragment shader instructions across shader-db by 0.3%.
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1791857d7d
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53c89c67f3
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@ -818,6 +818,7 @@ fs_visitor::try_emit_saturate(ir_expression *ir)
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if (!sat_val)
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return false;
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this->result = reg_undef;
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sat_val->accept(this);
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fs_reg src = this->result;
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@ -864,7 +865,11 @@ fs_visitor::visit(ir_expression *ir)
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if (try_emit_saturate(ir))
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return;
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/* This is where our caller would like us to put the result, if possible. */
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fs_reg saved_result_storage = this->result;
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for (operand = 0; operand < ir->get_num_operands(); operand++) {
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this->result = reg_undef;
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ir->operands[operand]->accept(this);
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if (this->result.file == BAD_FILE) {
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ir_print_visitor v;
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@ -882,10 +887,14 @@ fs_visitor::visit(ir_expression *ir)
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assert(!ir->operands[operand]->type->is_vector());
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}
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/* Storage for our result. If our result goes into an assignment, it will
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* just get copy-propagated out, so no worries.
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/* Inherit storage from our parent if possible, and otherwise we
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* alloc a temporary.
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*/
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if (saved_result_storage.file == BAD_FILE) {
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this->result = fs_reg(this, ir->type);
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} else {
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this->result = saved_result_storage;
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}
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switch (ir->operation) {
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case ir_unop_logic_not:
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@ -906,6 +915,9 @@ fs_visitor::visit(ir_expression *ir)
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case ir_unop_sign:
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temp = fs_reg(this, ir->type);
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/* Unalias the destination. (imagine a = sign(a)) */
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this->result = fs_reg(this, ir->type);
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emit(BRW_OPCODE_MOV, this->result, fs_reg(0.0f));
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inst = emit(BRW_OPCODE_CMP, reg_null_f, op[0], fs_reg(0.0f));
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@ -1054,6 +1066,9 @@ fs_visitor::visit(ir_expression *ir)
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break;
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case ir_binop_min:
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/* Unalias the destination */
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this->result = fs_reg(this, ir->type);
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inst = emit(BRW_OPCODE_CMP, this->result, op[0], op[1]);
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inst->conditional_mod = BRW_CONDITIONAL_L;
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@ -1061,6 +1076,9 @@ fs_visitor::visit(ir_expression *ir)
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inst->predicated = true;
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break;
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case ir_binop_max:
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/* Unalias the destination */
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this->result = fs_reg(this, ir->type);
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inst = emit(BRW_OPCODE_CMP, this->result, op[0], op[1]);
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inst->conditional_mod = BRW_CONDITIONAL_G;
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@ -1106,8 +1124,10 @@ fs_visitor::emit_assignment_writes(fs_reg &l, fs_reg &r,
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l.type = brw_type_for_base_type(type);
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r.type = brw_type_for_base_type(type);
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if (predicated || !l.equals(&r)) {
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fs_inst *inst = emit(BRW_OPCODE_MOV, l, r);
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inst->predicated = predicated;
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}
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l.reg_offset++;
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r.reg_offset++;
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@ -1142,9 +1162,21 @@ fs_visitor::visit(ir_assignment *ir)
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fs_inst *inst;
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/* FINISHME: arrays on the lhs */
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this->result = reg_undef;
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ir->lhs->accept(this);
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l = this->result;
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/* If we're doing a direct assignment, an RHS expression could
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* drop its result right into our destination. Otherwise, tell it
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* not to.
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*/
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if (ir->condition ||
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!(ir->lhs->type->is_scalar() ||
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(ir->lhs->type->is_vector() &&
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ir->write_mask == (1 << ir->lhs->type->vector_elements) - 1))) {
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this->result = reg_undef;
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}
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ir->rhs->accept(this);
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r = this->result;
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@ -1159,9 +1191,13 @@ fs_visitor::visit(ir_assignment *ir)
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ir->lhs->type->is_vector()) {
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for (int i = 0; i < ir->lhs->type->vector_elements; i++) {
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if (ir->write_mask & (1 << i)) {
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if (ir->condition) {
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inst = emit(BRW_OPCODE_MOV, l, r);
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if (ir->condition)
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inst->predicated = true;
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} else if (!l.equals(&r)) {
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inst = emit(BRW_OPCODE_MOV, l, r);
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}
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r.reg_offset++;
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}
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l.reg_offset++;
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@ -1202,16 +1238,19 @@ fs_visitor::emit_texture_gen4(ir_texture *ir, fs_reg dst, fs_reg coordinate,
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emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), fs_reg(0.0f));
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mlen++;
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} else if (ir->op == ir_txb) {
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this->result = reg_undef;
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ir->lod_info.bias->accept(this);
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emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result);
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mlen++;
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} else {
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assert(ir->op == ir_txl);
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this->result = reg_undef;
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ir->lod_info.lod->accept(this);
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emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result);
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mlen++;
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}
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this->result = reg_undef;
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ir->shadow_comparitor->accept(this);
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emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result);
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mlen++;
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@ -1246,10 +1285,12 @@ fs_visitor::emit_texture_gen4(ir_texture *ir, fs_reg dst, fs_reg coordinate,
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mlen += 6;
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if (ir->op == ir_txb) {
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this->result = reg_undef;
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ir->lod_info.bias->accept(this);
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emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result);
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mlen++;
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} else {
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this->result = reg_undef;
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ir->lod_info.lod->accept(this);
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emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result);
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mlen++;
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@ -1341,6 +1382,7 @@ fs_visitor::emit_texture_gen5(ir_texture *ir, fs_reg dst, fs_reg coordinate,
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if (ir->shadow_comparitor) {
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mlen = MAX2(mlen, header_present + 4 * reg_width);
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this->result = reg_undef;
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ir->shadow_comparitor->accept(this);
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emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result);
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mlen += reg_width;
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@ -1352,6 +1394,7 @@ fs_visitor::emit_texture_gen5(ir_texture *ir, fs_reg dst, fs_reg coordinate,
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inst = emit(FS_OPCODE_TEX, dst);
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break;
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case ir_txb:
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this->result = reg_undef;
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ir->lod_info.bias->accept(this);
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mlen = MAX2(mlen, header_present + 4 * reg_width);
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emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result);
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@ -1361,6 +1404,7 @@ fs_visitor::emit_texture_gen5(ir_texture *ir, fs_reg dst, fs_reg coordinate,
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break;
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case ir_txl:
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this->result = reg_undef;
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ir->lod_info.lod->accept(this);
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mlen = MAX2(mlen, header_present + 4 * reg_width);
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emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), this->result);
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@ -1464,6 +1508,7 @@ fs_visitor::visit(ir_texture *ir)
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int sampler;
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fs_inst *inst = NULL;
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this->result = reg_undef;
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ir->coordinate->accept(this);
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fs_reg coordinate = this->result;
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@ -1609,6 +1654,7 @@ fs_visitor::visit(ir_texture *ir)
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void
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fs_visitor::visit(ir_swizzle *ir)
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{
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this->result = reg_undef;
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ir->val->accept(this);
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fs_reg val = this->result;
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@ -1671,6 +1717,7 @@ fs_visitor::visit(ir_constant *ir)
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const unsigned size = type_size(ir->type->fields.array);
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for (unsigned i = 0; i < ir->type->length; i++) {
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this->result = reg_undef;
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ir->array_elements[i]->accept(this);
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fs_reg src_reg = this->result;
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@ -1686,6 +1733,7 @@ fs_visitor::visit(ir_constant *ir)
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ir_instruction *const field = (ir_instruction *) node;
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const unsigned size = type_size(field->type);
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this->result = reg_undef;
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field->accept(this);
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fs_reg src_reg = this->result;
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@ -1736,6 +1784,7 @@ fs_visitor::emit_bool_to_cond_code(ir_rvalue *ir)
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for (unsigned int i = 0; i < expr->get_num_operands(); i++) {
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assert(expr->operands[i]->type->is_scalar());
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this->result = reg_undef;
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expr->operands[i]->accept(this);
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op[i] = this->result;
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}
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@ -1800,6 +1849,7 @@ fs_visitor::emit_bool_to_cond_code(ir_rvalue *ir)
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return;
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}
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this->result = reg_undef;
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ir->accept(this);
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if (intel->gen >= 6) {
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@ -1829,6 +1879,7 @@ fs_visitor::emit_if_gen6(ir_if *ir)
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for (unsigned int i = 0; i < expr->get_num_operands(); i++) {
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assert(expr->operands[i]->type->is_scalar());
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this->result = reg_undef;
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expr->operands[i]->accept(this);
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op[i] = this->result;
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}
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@ -1890,6 +1941,7 @@ fs_visitor::emit_if_gen6(ir_if *ir)
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return;
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}
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this->result = reg_undef;
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ir->condition->accept(this);
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fs_inst *inst = emit(BRW_OPCODE_IF, reg_null_d, this->result, fs_reg(0));
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@ -1922,7 +1974,7 @@ fs_visitor::visit(ir_if *ir)
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foreach_iter(exec_list_iterator, iter, ir->then_instructions) {
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ir_instruction *ir = (ir_instruction *)iter.get();
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this->base_ir = ir;
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this->result = reg_undef;
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ir->accept(this);
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}
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@ -1932,7 +1984,7 @@ fs_visitor::visit(ir_if *ir)
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foreach_iter(exec_list_iterator, iter, ir->else_instructions) {
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ir_instruction *ir = (ir_instruction *)iter.get();
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this->base_ir = ir;
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this->result = reg_undef;
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ir->accept(this);
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}
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}
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@ -1955,9 +2007,13 @@ fs_visitor::visit(ir_loop *ir)
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counter = *(variable_storage(ir->counter));
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if (ir->from) {
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this->result = counter;
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this->base_ir = ir->from;
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this->result = counter;
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ir->from->accept(this);
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if (!this->result.equals(&counter))
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emit(BRW_OPCODE_MOV, counter, this->result);
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}
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}
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@ -1966,6 +2022,7 @@ fs_visitor::visit(ir_loop *ir)
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if (ir->to) {
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this->base_ir = ir->to;
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this->result = reg_undef;
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ir->to->accept(this);
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fs_inst *inst = emit(BRW_OPCODE_CMP, reg_null_cmp, counter, this->result);
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@ -1979,11 +2036,13 @@ fs_visitor::visit(ir_loop *ir)
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ir_instruction *ir = (ir_instruction *)iter.get();
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this->base_ir = ir;
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this->result = reg_undef;
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ir->accept(this);
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}
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if (ir->increment) {
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this->base_ir = ir->increment;
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this->result = reg_undef;
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ir->increment->accept(this);
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emit(BRW_OPCODE_ADD, counter, counter, this->result);
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}
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@ -2033,7 +2092,7 @@ fs_visitor::visit(ir_function *ir)
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foreach_iter(exec_list_iterator, iter, sig->body) {
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ir_instruction *ir = (ir_instruction *)iter.get();
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this->base_ir = ir;
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this->result = reg_undef;
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ir->accept(this);
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}
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}
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@ -4117,6 +4176,7 @@ fs_visitor::run()
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foreach_iter(exec_list_iterator, iter, *shader->ir) {
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ir_instruction *ir = (ir_instruction *)iter.get();
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base_ir = ir;
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this->result = reg_undef;
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ir->accept(this);
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}
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@ -571,7 +571,10 @@ public:
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bool failed;
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/* Result of last visit() method. */
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/* On entry to a visit() method, this is the storage for the
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* result. On exit, the visit() called may have changed it, in
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* which case the parent must use the new storage instead.
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*/
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fs_reg result;
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fs_reg pixel_x;
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