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Use one register less for addition and subtraction

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This commit is contained in:
Eugen Wissner 2024-10-01 22:44:55 +02:00
parent bbb15a0218
commit cafae5c830
Signed by: belka
GPG Key ID: A27FDC1E8EE902C0
1 changed files with 52 additions and 14 deletions
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56
lib/Language/Elna/CodeGenerator.hs
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@ -67,20 +67,58 @@ quadruple StopQuadruple = Vector.fromList
, Instruction (RiscV.BaseInstruction RiscV.OpImm $ RiscV.I RiscV.SP RiscV.ADDI RiscV.SP 4)
, Instruction (RiscV.BaseInstruction RiscV.Jalr $ RiscV.I RiscV.RA RiscV.JALR RiscV.Zero 0)
]
quadruple (AddQuadruple operand1 operand2 (Store register)) =
let (operandRegister1, statements1) = loadImmediateOrRegister operand1 RiscV.A0
(operandRegister2, statements2) = loadImmediateOrRegister operand2 RiscV.A1
in Vector.snoc (statements1 <> statements2)
$ Instruction
quadruple (AddQuadruple operand1 operand2 (Store register))
| IntOperand immediateOperand1 <- operand1
, IntOperand immediateOperand2 <- operand2 =
lui (immediateOperand1 + immediateOperand2) register
| VariableOperand variableOperand1 <- operand1
, VariableOperand variableOperand2 <- operand2 =
let Store operandRegister1 = variableOperand1
Store operandRegister2 = variableOperand2
in pure $ Instruction
$ RiscV.BaseInstruction RiscV.Op
$ RiscV.R register RiscV.ADD operandRegister1 operandRegister2 (RiscV.Funct7 0b0000000)
quadruple (SubtractionQuadruple operand1 operand2 (Store register)) =
let (operandRegister1, statements1) = loadImmediateOrRegister operand1 RiscV.A0
(operandRegister2, statements2) = loadImmediateOrRegister operand2 RiscV.A1
in Vector.snoc (statements1 <> statements2)
| VariableOperand variableOperand1 <- operand1
, IntOperand immediateOperand2 <- operand2 =
addImmediateRegister variableOperand1 immediateOperand2
| IntOperand immediateOperand1 <- operand1
, VariableOperand variableOperand2 <- operand2 =
addImmediateRegister variableOperand2 immediateOperand1
where
addImmediateRegister variableOperand immediateOperand =
let statements = lui immediateOperand register
Store operandRegister = variableOperand
in Vector.snoc statements
$ Instruction
$ RiscV.BaseInstruction RiscV.Op
$ RiscV.R register RiscV.ADD register operandRegister (RiscV.Funct7 0b0000000)
quadruple (SubtractionQuadruple operand1 operand2 (Store register))
| IntOperand immediateOperand1 <- operand1
, IntOperand immediateOperand2 <- operand2 =
lui (immediateOperand1 - immediateOperand2) register
| VariableOperand variableOperand1 <- operand1
, VariableOperand variableOperand2 <- operand2 =
let Store operandRegister1 = variableOperand1
Store operandRegister2 = variableOperand2
in pure $ Instruction
$ RiscV.BaseInstruction RiscV.Op
$ RiscV.R register RiscV.SUB operandRegister1 operandRegister2 (RiscV.Funct7 0b0100000)
| IntOperand immediateOperand1 <- operand1
, VariableOperand variableOperand2 <- operand2 =
let statements1 = lui immediateOperand1 register
Store operandRegister2 = variableOperand2
in Vector.snoc statements1
$ Instruction
$ RiscV.BaseInstruction RiscV.Op
$ RiscV.R register RiscV.SUB register operandRegister2 (RiscV.Funct7 0b0100000)
| VariableOperand variableOperand1 <- operand1
, IntOperand immediateOperand2 <- operand2 =
let statements2 = lui (negate immediateOperand2) register
Store operandRegister1 = variableOperand1
in Vector.snoc statements2
$ Instruction
$ RiscV.BaseInstruction RiscV.Op
$ RiscV.R register RiscV.ADD register operandRegister1 (RiscV.Funct7 0b0000000)
loadImmediateOrRegister :: RiscVOperand -> RiscV.XRegister -> (RiscV.XRegister, Vector Statement)
loadImmediateOrRegister (IntOperand intValue) targetRegister =