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https://github.com/irmen/prog8.git
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fix 6502 code for zp pointer lookup clobbering registers.
This commit is contained in:
Irmen de Jong
parent
24944ad49e
commit
73ec8c31ad
@ -400,7 +400,7 @@ class AsmGen6502Internal (
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} else {
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return if (allocator.isZpVar((target as PtNamedNode).scopedName)) {
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// pointervar is already in the zero page, no need to copy
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out(" ldy #0 | lda ($sourceName),y")
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loadAFromZpPointerVar(sourceName, true)
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sourceName
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} else {
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out("""
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@ -448,18 +448,26 @@ class AsmGen6502Internal (
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}
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}
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internal fun storeAIntoZpPointerVar(zpPointerVar: String) {
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internal fun storeAIntoZpPointerVar(zpPointerVar: String, keepY: Boolean) {
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if (isTargetCpu(CpuType.CPU65c02))
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out(" sta ($zpPointerVar)")
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else
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out(" ldy #0 | sta ($zpPointerVar),y")
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else {
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if(keepY)
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out(" sty P8ZP_SCRATCH_REG | ldy #0 | sta ($zpPointerVar),y | ldy P8ZP_SCRATCH_REG")
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else
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out(" ldy #0 | sta ($zpPointerVar),y")
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}
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}
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internal fun loadAFromZpPointerVar(zpPointerVar: String) {
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internal fun loadAFromZpPointerVar(zpPointerVar: String, keepY: Boolean) {
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if (isTargetCpu(CpuType.CPU65c02))
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out(" lda ($zpPointerVar)")
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else
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out(" ldy #0 | lda ($zpPointerVar),y")
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else {
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if(keepY)
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out(" sty P8ZP_SCRATCH_REG | ldy #0 | lda ($zpPointerVar),y | php | ldy P8ZP_SCRATCH_REG | plp")
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else
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out(" ldy #0 | lda ($zpPointerVar),y")
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}
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}
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private fun fixNameSymbols(name: String): String {
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@ -129,7 +129,7 @@ internal class AssignmentAsmGen(private val program: PtProgram,
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SourceStorageKind.MEMORY -> {
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fun assignViaExprEval(expression: PtExpression) {
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assignExpressionToVariable(expression, "P8ZP_SCRATCH_W2", DataType.UWORD)
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asmgen.loadAFromZpPointerVar("P8ZP_SCRATCH_W2")
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asmgen.loadAFromZpPointerVar("P8ZP_SCRATCH_W2", false)
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assignRegisterByte(assign.target, CpuRegister.A, false, true)
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}
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@ -2037,7 +2037,7 @@ internal class AssignmentAsmGen(private val program: PtProgram,
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fun assignViaExprEval(addressExpression: PtExpression) {
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asmgen.assignExpressionToVariable(addressExpression, "P8ZP_SCRATCH_W2", DataType.UWORD)
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asmgen.loadAFromZpPointerVar("P8ZP_SCRATCH_W2")
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asmgen.loadAFromZpPointerVar("P8ZP_SCRATCH_W2", false)
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asmgen.out(" ldy #0")
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assignRegisterpairWord(target, RegisterOrPair.AY)
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}
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@ -3880,14 +3880,14 @@ internal class AssignmentAsmGen(private val program: PtProgram,
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when(addressExpr) {
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is PtNumber, is PtIdentifier -> {
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assignExpressionToVariable(addressExpr, "P8ZP_SCRATCH_W2", DataType.UWORD)
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asmgen.storeAIntoZpPointerVar("P8ZP_SCRATCH_W2")
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asmgen.storeAIntoZpPointerVar("P8ZP_SCRATCH_W2", false)
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}
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else -> {
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// same as above but we need to save the A register
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asmgen.out(" pha")
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assignExpressionToVariable(addressExpr, "P8ZP_SCRATCH_W2", DataType.UWORD)
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asmgen.out(" pla")
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asmgen.storeAIntoZpPointerVar("P8ZP_SCRATCH_W2")
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asmgen.storeAIntoZpPointerVar("P8ZP_SCRATCH_W2", false)
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}
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}
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}
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@ -3989,7 +3989,7 @@ internal class AssignmentAsmGen(private val program: PtProgram,
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lda (P8ZP_SCRATCH_W2),y
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eor #255""")
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}
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asmgen.storeAIntoZpPointerVar("P8ZP_SCRATCH_W2")
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asmgen.storeAIntoZpPointerVar("P8ZP_SCRATCH_W2", false)
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}
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}
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}
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@ -957,7 +957,7 @@ internal class AugmentableAssignmentAsmGen(private val program: PtProgram,
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"<", "<=", ">", ">=" -> TODO("byte-var-to-pointer comparisons")
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else -> throw AssemblyError("invalid operator for in-place modification $operator")
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}
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asmgen.storeAIntoZpPointerVar(sourceName)
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asmgen.storeAIntoZpPointerVar(sourceName, false)
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}
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private fun inplacemodificationBytePointerWithLiteralval(pointervar: PtIdentifier, operator: String, value: Int) {
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@ -971,7 +971,7 @@ internal class AugmentableAssignmentAsmGen(private val program: PtProgram,
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} else {
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val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
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asmgen.out(" clc | adc #$value")
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asmgen.storeAIntoZpPointerVar(sourceName)
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asmgen.storeAIntoZpPointerVar(sourceName, false)
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}
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}
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"-" -> {
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@ -982,7 +982,7 @@ internal class AugmentableAssignmentAsmGen(private val program: PtProgram,
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} else {
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val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
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asmgen.out(" sec | sbc #$value")
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asmgen.storeAIntoZpPointerVar(sourceName)
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asmgen.storeAIntoZpPointerVar(sourceName, false)
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}
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}
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"*" -> {
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@ -991,50 +991,50 @@ internal class AugmentableAssignmentAsmGen(private val program: PtProgram,
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asmgen.out(" jsr math.mul_byte_${value}")
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else
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asmgen.out(" ldy #$value | jsr math.multiply_bytes")
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asmgen.storeAIntoZpPointerVar(sourceName)
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asmgen.storeAIntoZpPointerVar(sourceName, false)
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}
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"/" -> {
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val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
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if(value==0)
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throw AssemblyError("division by zero")
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asmgen.out(" ldy #$value | jsr math.divmod_ub_asm | tya")
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asmgen.storeAIntoZpPointerVar(sourceName)
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asmgen.storeAIntoZpPointerVar(sourceName, false)
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}
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"%" -> {
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val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
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if(value==0)
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throw AssemblyError("division by zero")
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asmgen.out(" ldy #$value | jsr math.divmod_ub_asm")
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asmgen.storeAIntoZpPointerVar(sourceName)
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asmgen.storeAIntoZpPointerVar(sourceName, false)
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}
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"<<" -> {
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if (value > 0) {
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val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
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repeat(value) { asmgen.out(" asl a") }
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asmgen.storeAIntoZpPointerVar(sourceName)
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asmgen.storeAIntoZpPointerVar(sourceName, false)
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}
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}
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">>" -> {
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if (value > 0) {
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val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
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repeat(value) { asmgen.out(" lsr a") }
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asmgen.storeAIntoZpPointerVar(sourceName)
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asmgen.storeAIntoZpPointerVar(sourceName, false)
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}
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}
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"&" -> {
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val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
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asmgen.out(" and #$value")
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asmgen.storeAIntoZpPointerVar(sourceName)
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asmgen.storeAIntoZpPointerVar(sourceName, false)
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}
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"|"-> {
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val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
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asmgen.out(" ora #$value")
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asmgen.storeAIntoZpPointerVar(sourceName)
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asmgen.storeAIntoZpPointerVar(sourceName, false)
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}
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"^" -> {
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val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
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asmgen.out(" eor #$value")
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asmgen.storeAIntoZpPointerVar(sourceName)
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asmgen.storeAIntoZpPointerVar(sourceName, false)
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}
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"==" -> {
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val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
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@ -1045,7 +1045,7 @@ internal class AugmentableAssignmentAsmGen(private val program: PtProgram,
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beq ++
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+ lda #1
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+""")
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asmgen.storeAIntoZpPointerVar(sourceName)
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asmgen.storeAIntoZpPointerVar(sourceName, false)
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}
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"!=" -> {
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val sourceName = asmgen.loadByteFromPointerIntoA(pointervar)
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@ -1056,7 +1056,7 @@ internal class AugmentableAssignmentAsmGen(private val program: PtProgram,
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beq ++
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+ lda #1
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+""")
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asmgen.storeAIntoZpPointerVar(sourceName)
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asmgen.storeAIntoZpPointerVar(sourceName, false)
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}
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// pretty uncommon, who's going to assign a comparison boolean expresion to a pointer?:
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"<", "<=", ">", ">=" -> TODO("byte-litval-to-pointer comparisons")
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