On Thu, Oct 24, 2013 at 8:53 AM, Eric Anholt <e...@anholt.net> wrote: > I noticed this in a shader in Unigine Heaven that was spilling. While it > doesn't really reduce register pressure, it shaves a few instructions > anyway (7955 -> 7882). > --- > src/glsl/opt_algebraic.cpp | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp > index 37b2f02..ff06cfc 100644 > --- a/src/glsl/opt_algebraic.cpp > +++ b/src/glsl/opt_algebraic.cpp > @@ -387,6 +387,14 @@ ir_algebraic_visitor::handle_expression(ir_expression > *ir) > } > break; > > + case ir_binop_rshift: > + case ir_binop_lshift: > + if (is_vec_zero(op_const[0])) > + return ir->operands[1]; > + else if (is_vec_zero(op_const[1])) > + return ir->operands[0]; > + break; > + > case ir_binop_logic_and: > /* FINISHME: Also simplify (a && a) to (a). */ > if (is_vec_one(op_const[0])) { > -- > 1.8.4.rc3
Prefix should be glsl:, but other than that Reviewed-by: Matt Turner <matts...@gmail.com> _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev