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glsl: Optimize various cases of fma (aka MAD).

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Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Eric Anholt 2014-01-18 11:06:16 -08:00
parent 44577c4857
commit de796b0ef0
1 changed files with 13 additions and 0 deletions
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13
src/glsl/opt_algebraic.cpp
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@ -547,6 +547,19 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
break;
case ir_triop_fma:
/* Operands are op0 * op1 + op2. */
if (is_vec_zero(op_const[0]) || is_vec_zero(op_const[1])) {
return ir->operands[2];
} else if (is_vec_zero(op_const[2])) {
return mul(ir->operands[0], ir->operands[1]);
} else if (is_vec_one(op_const[0])) {
return add(ir->operands[1], ir->operands[2]);
} else if (is_vec_one(op_const[1])) {
return add(ir->operands[0], ir->operands[2]);
}
break;
case ir_triop_lrp:
/* Operands are (x, y, a). */
if (is_vec_zero(op_const[2])) {