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IR: optimize rol ror

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This commit is contained in:
Irmen de Jong 2024-01-18 21:44:49 +01:00
parent 03831a7394
commit 43027a4728
2 changed files with 41 additions and 13 deletions
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50
codeGenIntermediate/src/prog8/codegen/intermediate/BuiltinFuncGen.kt
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@ -41,10 +41,10 @@ internal class BuiltinFuncGen(private val codeGen: IRCodeGen, private val exprGe
"reverse" -> funcReverse(call)
"setlsb" -> funcSetLsbMsb(call, false)
"setmsb" -> funcSetLsbMsb(call, true)
"rol" -> funcRolRor(Opcode.ROXL, call)
"ror" -> funcRolRor(Opcode.ROXR, call)
"rol2" -> funcRolRor(Opcode.ROL, call)
"ror2" -> funcRolRor(Opcode.ROR, call)
"rol" -> funcRolRor(call)
"ror" -> funcRolRor(call)
"rol2" -> funcRolRor(call)
"ror2" -> funcRolRor(call)
"prog8_lib_stringcompare" -> funcStringCompare(call)
"prog8_lib_square_byte" -> funcSquare(call, IRDataType.BYTE)
"prog8_lib_square_word" -> funcSquare(call, IRDataType.WORD)
@ -628,21 +628,51 @@ internal class BuiltinFuncGen(private val codeGen: IRCodeGen, private val exprGe
return ExpressionCodeResult(result, IRDataType.BYTE, resultReg, -1)
}
private fun funcRolRor(opcode: Opcode, call: PtBuiltinFunctionCall): ExpressionCodeResult {
// TODO optimize this to use the other ROL/ROR instructions too to always load into a temp reg
val vmDt = irType(call.args[0].type)
private fun funcRolRor(call: PtBuiltinFunctionCall): ExpressionCodeResult {
val result = mutableListOf<IRCodeChunkBase>()
val saveCarry = opcode in OpcodesThatDependOnCarry && !call.args[0].isSimple()
val arg = call.args[0]
val vmDt = irType(arg.type)
val opcodeMemAndReg = when(call.name) {
"rol" -> Opcode.ROXLM to Opcode.ROXL
"ror" -> Opcode.ROXRM to Opcode.ROXR
"rol2" -> Opcode.ROLM to Opcode.ROL
"ror2" -> Opcode.RORM to Opcode.ROR
else -> throw AssemblyError("wrong func")
}
val ident = arg as? PtIdentifier
if(ident!=null) {
addInstr(result, IRInstruction(opcodeMemAndReg.first, vmDt, labelSymbol = ident.name), null)
return ExpressionCodeResult(result, vmDt, -1, -1)
}
val memAddr = (arg as? PtMemoryByte)?.address?.asConstInteger()
if(memAddr!=null) {
addInstr(result, IRInstruction(opcodeMemAndReg.first, vmDt, address = memAddr), null)
return ExpressionCodeResult(result, vmDt, -1, -1)
}
val arr = (arg as? PtArrayIndexer)
val index = arr?.index?.asConstInteger()
if(arr!=null && index!=null) {
val variable = arr.variable.name
val itemsize = codeGen.program.memsizer.memorySize(arr.type)
addInstr(result, IRInstruction(opcodeMemAndReg.first, vmDt, labelSymbol = variable, symbolOffset = index*itemsize), null)
return ExpressionCodeResult(result, vmDt, -1, -1)
}
val opcode = opcodeMemAndReg.second
val saveCarry = opcode in OpcodesThatDependOnCarry && !arg.isSimple()
if(saveCarry)
addInstr(result, IRInstruction(Opcode.PUSHST), null) // save Carry
val tr = exprGen.translateExpression(call.args[0])
val tr = exprGen.translateExpression(arg)
addToResult(result, tr, tr.resultReg, -1)
if(saveCarry)
addInstr(result, IRInstruction(Opcode.POPST), null)
addInstr(result, IRInstruction(opcode, vmDt, reg1 = tr.resultReg), null)
if(saveCarry)
addInstr(result, IRInstruction(Opcode.PUSHST), null) // save Carry
result += assignRegisterTo(call.args[0], tr.resultReg)
result += assignRegisterTo(arg, tr.resultReg)
if(saveCarry)
addInstr(result, IRInstruction(Opcode.POPST), null)
return ExpressionCodeResult(result, vmDt, -1, -1)

4
docs/source/todo.rst
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@ -1,9 +1,7 @@
TODO
====
Mark had a compiler crash FatalAstException: invalid dt.
IR: optimize funcRolRor()
imageviewer: bmp palette is off (autumn.bmp)
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