Module: Mesa Branch: master Commit: 5ccdc23a86978628449ace0058cd3697020b0c94 URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=5ccdc23a86978628449ace0058cd3697020b0c94
Author: Matt Turner <[email protected]> Date: Sun Sep 7 00:41:41 2014 -0700 glsl: Recognize open-coded pow(x, y). pow(x, y) is equivalent to exp(log(x) * y). instructions in affected programs: 578 -> 458 (-20.76%) Reviewed-by: Kenneth Graunke <[email protected]> --- src/glsl/opt_algebraic.cpp | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp index 447618f..0cdb8ec 100644 --- a/src/glsl/opt_algebraic.cpp +++ b/src/glsl/opt_algebraic.cpp @@ -357,6 +357,20 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir) if (op_expr[0]->operation == ir_unop_log2) { return op_expr[0]->operands[0]; } + + if (!options->EmitNoPow && op_expr[0]->operation == ir_binop_mul) { + for (int log2_pos = 0; log2_pos < 2; log2_pos++) { + ir_expression *log2_expr = + op_expr[0]->operands[log2_pos]->as_expression(); + + if (log2_expr && log2_expr->operation == ir_unop_log2) { + return new(mem_ctx) ir_expression(ir_binop_pow, + ir->type, + log2_expr->operands[0], + op_expr[0]->operands[1 - log2_pos]); + } + } + } break; case ir_unop_log2: _______________________________________________ mesa-commit mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-commit
