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Shader: Implemented compound predicates in fsetp.
You can specify three predicates in an fsetp instruction: P1 = (Value1 Comp Value2) OP P0; P2 = !(Value1 Comp Value2) OP P0;
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@ -597,6 +597,45 @@ private:
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return variable;
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}
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/**
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* Returns the comparison string to use to compare two values in the 'set' family of
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* instructions.
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* @params condition The condition used in the 'set'-family instruction.
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* @returns String corresponding to the GLSL operator that matches the desired comparison.
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*/
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std::string GetPredicateComparison(Tegra::Shader::PredCondition condition) const {
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using Tegra::Shader::PredCondition;
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static const std::unordered_map<PredCondition, const char*> PredicateComparisonStrings = {
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{PredCondition::LessThan, "<"},
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{PredCondition::Equal, "=="},
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{PredCondition::LessEqual, "<="},
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};
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auto comparison = PredicateComparisonStrings.find(condition);
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ASSERT_MSG(comparison != PredicateComparisonStrings.end(),
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"Unknown predicate comparison operation");
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return comparison->second;
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}
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/**
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* Returns the operator string to use to combine two predicates in the 'setp' family of
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* instructions.
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* @params operation The operator used in the 'setp'-family instruction.
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* @returns String corresponding to the GLSL operator that matches the desired operator.
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*/
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std::string GetPredicateCombiner(Tegra::Shader::PredOperation operation) const {
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using Tegra::Shader::PredOperation;
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static const std::unordered_map<PredOperation, const char*> PredicateOperationStrings = {
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{PredOperation::And, "&&"},
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{PredOperation::Or, "||"},
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{PredOperation::Xor, "^"},
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};
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auto op = PredicateOperationStrings.find(operation);
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ASSERT_MSG(op != PredicateOperationStrings.end(), "Unknown predicate operation");
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return op->second;
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}
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/*
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* Returns whether the instruction at the specified offset is a 'sched' instruction.
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* Sched instructions always appear before a sequence of 3 instructions.
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@ -888,28 +927,25 @@ private:
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}
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using Tegra::Shader::Pred;
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ASSERT_MSG(instr.fsetp.pred0 == static_cast<u64>(Pred::UnusedIndex) &&
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instr.fsetp.pred39 == static_cast<u64>(Pred::UnusedIndex),
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"Compound predicates are not implemented");
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// We can't use the constant predicate as destination.
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ASSERT(instr.fsetp.pred3 != static_cast<u64>(Pred::UnusedIndex));
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using Tegra::Shader::PredCondition;
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switch (instr.fsetp.cond) {
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case PredCondition::LessThan:
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SetPredicate(instr.fsetp.pred3, '(' + op_a + ") < (" + op_b + ')');
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break;
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case PredCondition::Equal:
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SetPredicate(instr.fsetp.pred3, '(' + op_a + ") == (" + op_b + ')');
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break;
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case PredCondition::LessEqual:
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SetPredicate(instr.fsetp.pred3, '(' + op_a + ") <= (" + op_b + ')');
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break;
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default:
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NGLOG_CRITICAL(HW_GPU, "Unhandled predicate condition: {} (a: {}, b: {})",
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static_cast<unsigned>(instr.fsetp.cond.Value()), op_a, op_b);
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UNREACHABLE();
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std::string second_pred =
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GetPredicateCondition(instr.fsetp.pred39, instr.fsetp.neg_pred != 0);
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std::string comparator = GetPredicateComparison(instr.fsetp.cond);
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std::string combiner = GetPredicateCombiner(instr.fsetp.op);
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std::string predicate = '(' + op_a + ") " + comparator + " (" + op_b + ')';
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// Set the primary predicate to the result of Predicate OP SecondPredicate
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SetPredicate(instr.fsetp.pred3,
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'(' + predicate + ") " + combiner + " (" + second_pred + ')');
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if (instr.fsetp.pred0 != static_cast<u64>(Pred::UnusedIndex)) {
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// Set the secondary predicate to the result of !Predicate OP SecondPredicate, if
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// enabled
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SetPredicate(instr.fsetp.pred0,
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"!(" + predicate + ") " + combiner + " (" + second_pred + ')');
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}
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break;
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}
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