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ir_to_mesa: Skip useless comparison instructions.

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Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Matt Turner 2015-12-03 16:41:36 -08:00
parent 4a5cff24d7
commit 257fb76403
1 changed files with 7 additions and 1 deletions
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8
src/mesa/program/ir_to_mesa.cpp
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@ -1113,7 +1113,13 @@ ir_to_mesa_visitor::visit(ir_expression *ir)
if (ir->operands[0]->type->is_vector() ||
ir->operands[1]->type->is_vector()) {
src_reg temp = get_temp(glsl_type::vec4_type);
emit(ir, OPCODE_SNE, dst_reg(temp), op[0], op[1]);
if (ir->operands[0]->type->is_boolean() &&
ir->operands[1]->as_constant() &&
ir->operands[1]->as_constant()->is_zero()) {
temp = op[0];
} else {
emit(ir, OPCODE_SNE, dst_reg(temp), op[0], op[1]);
}
/* After the dot-product, the value will be an integer on the
* range [0,4]. Zero stays zero, and positive values become 1.0.