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glsl: Optimize lrp(x, 0, a) into x - (x * a).

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Helps one program in shader-db:

instructions in affected programs:     96 -> 92 (-4.17%)

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Matt Turner 2014-02-24 15:00:45 -08:00
parent ecc6c3d4ab
commit d5fa8a9562
1 changed files with 2 additions and 0 deletions
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2
src/glsl/opt_algebraic.cpp
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@ -570,6 +570,8 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
return ir->operands[0];
} else if (is_vec_zero(op_const[0])) {
return mul(ir->operands[1], ir->operands[2]);
} else if (is_vec_zero(op_const[1])) {
return add(ir->operands[0], neg(mul(ir->operands[0], ir->operands[2])));
}
break;