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shader/arithmetic_integer: Change IAdd to UAdd to avoid signed overflow

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Signed integer addition overflow might be undefined behavior. It's free
to change operations to UAdd and use unsigned integers to avoid
potential bugs.
This commit is contained in:
ReinUsesLisp 2020-04-25 22:42:33 -03:00
parent c788f9c0bd
commit 2a96bea6a7
1 changed files with 2 additions and 2 deletions
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4
src/video_core/shader/decode/arithmetic_integer.cpp
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@ -40,12 +40,12 @@ u32 ShaderIR::DecodeArithmeticInteger(NodeBlock& bb, u32 pc) {
op_a = GetOperandAbsNegInteger(op_a, false, instr.alu_integer.negate_a, true); op_a = GetOperandAbsNegInteger(op_a, false, instr.alu_integer.negate_a, true);
op_b = GetOperandAbsNegInteger(op_b, false, instr.alu_integer.negate_b, true); op_b = GetOperandAbsNegInteger(op_b, false, instr.alu_integer.negate_b, true);
Node value = Operation(OperationCode::IAdd, op_a, op_b); Node value = Operation(OperationCode::UAdd, op_a, op_b);
if (instr.iadd.x) { if (instr.iadd.x) {
Node carry = GetInternalFlag(InternalFlag::Carry); Node carry = GetInternalFlag(InternalFlag::Carry);
Node x = Operation(OperationCode::Select, std::move(carry), Immediate(1), Immediate(0)); Node x = Operation(OperationCode::Select, std::move(carry), Immediate(1), Immediate(0));
value = Operation(OperationCode::IAdd, std::move(value), std::move(x)); value = Operation(OperationCode::UAdd, std::move(value), std::move(x));
} }
if (instr.generates_cc) { if (instr.generates_cc) {