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glsl: Transform pow(x, 4) into (x*x)*(x*x). 

Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner 2015-03-16 21:33:31 -07:00
parent 18f44d3030
commit 9b577d5702
1 changed files with 20 additions and 0 deletions
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20
src/glsl/opt_algebraic.cpp
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@ -98,6 +98,12 @@ is_vec_two(ir_constant *ir)
return (ir == NULL) ? false : ir->is_value(2.0, 2);
}
static inline bool
is_vec_four(ir_constant *ir)
{
return (ir == NULL) ? false : ir->is_value(4.0, 4);
}
static inline bool
is_vec_negative_one(ir_constant *ir)
{
@ -774,6 +780,20 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
return mul(x, x);
}
if (is_vec_four(op_const[1])) {
ir_variable *x = new(ir) ir_variable(ir->operands[1]->type, "x",
ir_var_temporary);
base_ir->insert_before(x);
base_ir->insert_before(assign(x, ir->operands[0]));
ir_variable *squared = new(ir) ir_variable(ir->operands[1]->type,
"squared",
ir_var_temporary);
base_ir->insert_before(squared);
base_ir->insert_before(assign(squared, mul(x, x)));
return mul(squared, squared);
}
break;
case ir_binop_min: