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glsl: Optimize pow(x, 1) -> x.

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total instructions in shared programs: 1627826 -> 1627754 (-0.00%)
instructions in affected programs:     6640 -> 6568 (-1.08%)
GAINED:                                0
LOST:                                  0

(HoN and savage2)

Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Eric Anholt
2014-01-18 10:57:29 -08:00
parent 6d7c123d6c
commit d72956790f
1 changed files with 4 additions and 0 deletions
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4
src/glsl/opt_algebraic.cpp
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@@ -520,6 +520,10 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
if (is_vec_one(op_const[0]))
return op_const[0];
/* x^1 == x */
if (is_vec_one(op_const[1]))
return ir->operands[0];
/* pow(2,x) == exp2(x) */
if (is_vec_two(op_const[0]))
return expr(ir_unop_exp2, ir->operands[1]);