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Shader: Implemented compound predicates in fset.
You can specify a predicate in the fset instruction: Result = ((Value1 Comp Value2) OP P0) ? 1.0 : 0.0;
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@ -609,6 +609,7 @@ private:
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{PredCondition::LessThan, "<"},
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{PredCondition::Equal, "=="},
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{PredCondition::LessEqual, "<="},
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{PredCondition::GreaterThan, ">"},
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};
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auto comparison = PredicateComparisonStrings.find(condition);
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@ -628,7 +629,7 @@ private:
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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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{PredOperation::Xor, "^^"},
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};
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auto op = PredicateOperationStrings.find(operation);
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@ -977,35 +978,18 @@ private:
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op_b = "abs(" + op_b + ')';
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}
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using Tegra::Shader::Pred;
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ASSERT_MSG(instr.fset.pred39 == static_cast<u64>(Pred::UnusedIndex),
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"Compound predicates are not implemented");
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// The fset instruction sets a register to 1.0 if the condition is true, and to 0
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// otherwise.
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using Tegra::Shader::PredCondition;
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switch (instr.fset.cond) {
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case PredCondition::LessThan:
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regs.SetRegisterToFloat(instr.gpr0, 0,
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"((" + op_a + ") < (" + op_b + ")) ? 1.0 : 0", 1, 1);
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break;
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case PredCondition::Equal:
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regs.SetRegisterToFloat(instr.gpr0, 0,
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"((" + op_a + ") == (" + op_b + ")) ? 1.0 : 0", 1, 1);
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break;
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case PredCondition::LessEqual:
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regs.SetRegisterToFloat(instr.gpr0, 0,
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"((" + op_a + ") <= (" + op_b + ")) ? 1.0 : 0", 1, 1);
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break;
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case PredCondition::GreaterThan:
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regs.SetRegisterToFloat(instr.gpr0, 0,
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"((" + op_a + ") > (" + op_b + ")) ? 1.0 : 0", 1, 1);
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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.fset.cond.Value()), op_a, op_b);
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UNREACHABLE();
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}
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std::string second_pred =
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GetPredicateCondition(instr.fset.pred39, instr.fset.neg_pred != 0);
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std::string comparator = GetPredicateComparison(instr.fset.cond);
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std::string combiner = GetPredicateCombiner(instr.fset.op);
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std::string predicate = "(((" + op_a + ") " + comparator + " (" + op_b + ")) " +
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combiner + " (" + second_pred + "))";
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regs.SetRegisterToFloat(instr.gpr0, 0, predicate + " ? 1.0 : 0.0", 1, 1);
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break;
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}
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default: {
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