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optimize assignment to memory pointer with fixed byte offset

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This commit is contained in:
Irmen de Jong 2021-01-15 20:46:47 +01:00
parent 9f72779cdc
commit 76d54fbe5c
1 changed files with 62 additions and 14 deletions
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76
compiler/src/prog8/compiler/target/c64/codegen/assignment/AssignmentAsmGen.kt
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@ -1960,6 +1960,16 @@ internal class AssignmentAsmGen(private val program: Program, private val asmgen
private fun storeByteViaRegisterAInMemoryAddress(ldaInstructionArg: String, memoryAddress: DirectMemoryWrite) {
val addressExpr = memoryAddress.addressExpression
val addressLv = addressExpr as? NumericLiteralValue
fun storeViaExprEval()
{
assignExpressionToVariable(addressExpr, asmgen.asmVariableName("P8ZP_SCRATCH_W2"), DataType.UWORD, null)
if (CompilationTarget.instance.machine.cpu == CpuType.CPU65c02)
asmgen.out(" lda $ldaInstructionArg | sta (P8ZP_SCRATCH_W2)")
else
asmgen.out(" lda $ldaInstructionArg | ldy #0 | sta (P8ZP_SCRATCH_W2),y")
}
when {
addressLv != null -> {
asmgen.out(" lda $ldaInstructionArg | sta ${addressLv.number.toHex()}")
@ -1967,13 +1977,26 @@ internal class AssignmentAsmGen(private val program: Program, private val asmgen
addressExpr is IdentifierReference -> {
asmgen.storeByteIntoPointer(addressExpr, ldaInstructionArg)
}
else -> {
assignExpressionToVariable(addressExpr, asmgen.asmVariableName("P8ZP_SCRATCH_W2"), DataType.UWORD, null)
if (CompilationTarget.instance.machine.cpu == CpuType.CPU65c02)
asmgen.out(" lda $ldaInstructionArg | sta (P8ZP_SCRATCH_W2)")
else
asmgen.out(" lda $ldaInstructionArg | ldy #0 | sta (P8ZP_SCRATCH_W2),y")
addressExpr is BinaryExpression -> {
// try to optimize simple cases like storing value to ptr+1, ptr+2...
var optimized = false
if(addressExpr.operator=="+") {
// we can assume const operand has been moved to the right.
val constOperand = addressExpr.right.constValue(program)
if(constOperand!=null) {
val intIndex = constOperand.number.toInt()
if(intIndex in 1..255) {
assignExpressionToVariable(addressExpr.left, asmgen.asmVariableName("P8ZP_SCRATCH_W2"), DataType.UWORD, null)
asmgen.out(" lda $ldaInstructionArg | ldy #${intIndex} | sta (P8ZP_SCRATCH_W2),y")
optimized = true
}
}
}
if(!optimized)
storeViaExprEval()
}
else -> storeViaExprEval()
}
}
@ -1982,6 +2005,18 @@ internal class AssignmentAsmGen(private val program: Program, private val asmgen
val addressExpr = memoryAddress.addressExpression
val addressLv = addressExpr as? NumericLiteralValue
val registerName = register.name.toLowerCase()
fun storeViaExprEval()
{
asmgen.saveRegisterStack(register, false)
assignExpressionToVariable(addressExpr, asmgen.asmVariableName("P8ZP_SCRATCH_W2"), DataType.UWORD, null)
asmgen.restoreRegisterStack(CpuRegister.A, false)
if (CompilationTarget.instance.machine.cpu == CpuType.CPU65c02)
asmgen.out(" sta (P8ZP_SCRATCH_W2)")
else
asmgen.out(" ldy #0 | sta (P8ZP_SCRATCH_W2),y")
}
when {
addressLv != null -> {
asmgen.out(" st$registerName ${addressLv.number.toHex()}")
@ -1994,15 +2029,28 @@ internal class AssignmentAsmGen(private val program: Program, private val asmgen
}
asmgen.storeByteIntoPointer(addressExpr, null)
}
else -> {
asmgen.saveRegisterStack(register, false)
assignExpressionToVariable(addressExpr, asmgen.asmVariableName("P8ZP_SCRATCH_W2"), DataType.UWORD, null)
asmgen.restoreRegisterStack(CpuRegister.A, false)
if (CompilationTarget.instance.machine.cpu == CpuType.CPU65c02)
asmgen.out(" sta (P8ZP_SCRATCH_W2)")
else
asmgen.out(" ldy #0 | sta (P8ZP_SCRATCH_W2),y")
addressExpr is BinaryExpression -> {
// try to optimize simple cases like storing value to ptr+1, ptr+2...
var optimized = false
if(addressExpr.operator=="+") {
// we can assume const operand has been moved to the right.
val constOperand = addressExpr.right.constValue(program)
if(constOperand!=null) {
val intIndex = constOperand.number.toInt()
if(intIndex in 1..255) {
asmgen.saveRegisterStack(register, false)
assignExpressionToVariable(addressExpr.left, asmgen.asmVariableName("P8ZP_SCRATCH_W2"), DataType.UWORD, null)
asmgen.restoreRegisterStack(CpuRegister.A, false)
asmgen.out(" ldy #${intIndex} | sta (P8ZP_SCRATCH_W2),y")
optimized = true
}
}
}
if(!optimized)
storeViaExprEval()
}
else -> storeViaExprEval()
}
}