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glsl: Optimize (v.x + v.y) + (v.z + v.w) into dot(v, 1.0).

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Cuts five instructions out of SynMark's Gl32VSInstancing benchmark.
This commit is contained in:
Matt Turner 2014-03-02 08:59:50 -08:00
parent f043971097
commit e974781301
1 changed files with 46 additions and 0 deletions
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46
src/glsl/opt_algebraic.cpp
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@ -119,6 +119,44 @@ update_type(ir_expression *ir)
ir->type = ir->operands[1]->type;
}
/* Recognize (v.x + v.y) + (v.z + v.w) as dot(v, 1.0) */
static ir_expression *
try_replace_with_dot(ir_expression *expr0, ir_expression *expr1, void *mem_ctx)
{
if (expr0 && expr0->operation == ir_binop_add &&
expr1 && expr1->operation == ir_binop_add) {
ir_swizzle *x = expr0->operands[0]->as_swizzle();
ir_swizzle *y = expr0->operands[1]->as_swizzle();
ir_swizzle *z = expr1->operands[0]->as_swizzle();
ir_swizzle *w = expr1->operands[1]->as_swizzle();
if (!x || x->mask.num_components != 1 ||
!y || y->mask.num_components != 1 ||
!z || z->mask.num_components != 1 ||
!w || w->mask.num_components != 1) {
return NULL;
}
bool swiz_seen[4] = {false, false, false, false};
swiz_seen[x->mask.x] = true;
swiz_seen[y->mask.x] = true;
swiz_seen[z->mask.x] = true;
swiz_seen[w->mask.x] = true;
if (!swiz_seen[0] || !swiz_seen[1] ||
!swiz_seen[2] || !swiz_seen[3]) {
return NULL;
}
if (x->val->equals(y->val) &&
x->val->equals(z->val) &&
x->val->equals(w->val)) {
return dot(x->val, new(mem_ctx) ir_constant(1.0f, 4));
}
}
return NULL;
}
void
ir_algebraic_visitor::reassociate_operands(ir_expression *ir1,
int op1,
@ -332,6 +370,14 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
if (op_const[1] && !op_const[0])
reassociate_constant(ir, 1, op_const[1], op_expr[0]);
/* Recognize (v.x + v.y) + (v.z + v.w) as dot(v, 1.0) */
if (options->OptimizeForAOS) {
ir_expression *expr = try_replace_with_dot(op_expr[0], op_expr[1],
mem_ctx);
if (expr)
return expr;
}
/* Replace (-x + y) * a + x and commutative variations with lrp(x, y, a).
*
* (-x + y) * a + x