glsl: When lowering non-constant vector indexing, respect existing conditions
If the non-constant index was in the LHS of an assignment, any existing condititon on that assignment would be lost. Reviewed-by: Eric Anholt <eric@anholt.net>
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@ -171,21 +171,23 @@ ir_vec_index_to_cond_assign_visitor::visit_leave(ir_assignment *ir)
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assert(orig_deref->array_index->type->base_type == GLSL_TYPE_INT);
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exec_list list;
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/* Store the index to a temporary to avoid reusing its tree. */
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index = new(ir) ir_variable(glsl_type::int_type, "vec_index_tmp_i",
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ir_var_temporary);
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ir->insert_before(index);
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list.push_tail(index);
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deref = new(ir) ir_dereference_variable(index);
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assign = new(ir) ir_assignment(deref, orig_deref->array_index, NULL);
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ir->insert_before(assign);
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list.push_tail(assign);
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/* Store the RHS to a temporary to avoid reusing its tree. */
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var = new(ir) ir_variable(ir->rhs->type, "vec_index_tmp_v",
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ir_var_temporary);
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ir->insert_before(var);
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list.push_tail(var);
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deref = new(ir) ir_dereference_variable(var);
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assign = new(ir) ir_assignment(deref, ir->rhs, NULL);
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ir->insert_before(assign);
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list.push_tail(assign);
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/* Generate a conditional move of each vector element to the temp. */
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for (i = 0; i < orig_deref->array->type->vector_elements; i++) {
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@ -205,8 +207,25 @@ ir_vec_index_to_cond_assign_visitor::visit_leave(ir_assignment *ir)
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deref = new(ir) ir_dereference_variable(var);
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assign = new(ir) ir_assignment(swizzle, deref, condition);
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ir->insert_before(assign);
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list.push_tail(assign);
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}
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/* If the original assignment has a condition, respect that original
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* condition! This is acomplished by wrapping the new conditional
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* assignments in an if-statement that uses the original condition.
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*/
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if (ir->condition != NULL) {
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/* No need to clone the condition because the IR that it hangs on is
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* going to be removed from the instruction sequence.
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*/
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ir_if *if_stmt = new(mem_ctx) ir_if(ir->condition);
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list.move_nodes_to(&if_stmt->then_instructions);
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ir->insert_before(if_stmt);
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} else {
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ir->insert_before(&list);
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}
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ir->remove();
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this->progress = true;
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