added new c64utils.str2(u)word that doesn't use kernel float routines

fixed processing of register pair return value of asmsub

compiler/res/prog8lib/c64utils.p8

@@ -168,140 +168,117 @@ asmsub  uword2decimal  (uword value @ AY) -> clobbers(A,Y) -> ()  {
 }
 
 
-asmsub  str2byte  (str string @ AY) -> clobbers(Y) -> (byte @ A) {
+asmsub str2uword(str string @ AY) -> clobbers() -> (uword @ AY) {
+	; -- returns the unsigned word value of the string number argument in AY
+	;    the number may NOT be preceded by a + sign and may NOT contain spaces
+	;    (any non-digit character will terminate the number string that is parsed)
 	%asm {{
-		; -- convert string (address in A/Y) to byte in A
+_result = c64.SCRATCH_ZPWORD2
-		;    doesn't use any kernal routines
+		sta  _mod+1
+		sty  _mod+2
+		ldy  #0
+		sty  _result
+		sty  _result+1
+_mod		lda  $ffff,y		; modified
+		sec
+		sbc  #48
+		bpl  +
+_done		; return result
+		lda  _result
+		ldy  _result+1
+		rts
++		cmp  #10
+		bcs  _done
+		; add digit to result
+		pha
+		jsr  _result_times_10
+		pla
+		clc
+		adc  _result
+		sta  _result
+		bcc  +
+		inc  _result+1
++		iny
+		bne  _mod
+		; never reached
+
+_result_times_10     ; (W*4 + W)*2
+		lda  _result+1
+		sta  c64.SCRATCH_ZPREG
+		lda  _result
+		asl  a
+		rol  c64.SCRATCH_ZPREG
+		asl  a
+		rol  c64.SCRATCH_ZPREG
+		clc
+		adc  _result
+		sta  _result
+		lda  c64.SCRATCH_ZPREG
+		adc  _result+1
+		asl  _result
+		rol  a
+		sta  _result+1
+		rts
+	}}
+}
+
+
+asmsub str2word(str string @ AY) -> clobbers() -> (word @ AY) {
+	; -- returns the signed word value of the string number argument in AY
+	;    the number may be preceded by a + or - sign but may NOT contain spaces
+	;    (any non-digit character will terminate the number string that is parsed)
+	%asm {{
+_result = c64.SCRATCH_ZPWORD2
 		sta  c64.SCRATCH_ZPWORD1
 		sty  c64.SCRATCH_ZPWORD1+1
 		ldy  #0
+		sty  _result
+		sty  _result+1
+		sty  _negative
 		lda  (c64.SCRATCH_ZPWORD1),y
-		cmp  #'-'
+		cmp  #'+'
-		beq  +
-		jmp  str2ubyte._enter
-+		inc  c64.SCRATCH_ZPWORD1
 		bne  +
-		inc  c64.SCRATCH_ZPWORD1+1
-+		jsr  str2ubyte._enter
-		eor  #$ff
-		sec
-		adc  #0
-		rts
-	}}
-}
-
-asmsub  str2ubyte  (str string @ AY) -> clobbers(Y) -> (ubyte @ A) {
-	%asm {{
-		; -- convert string (address in A/Y) to ubyte in A
-		;    doesn't use any kernal routines
-		sta  c64.SCRATCH_ZPWORD1
-		sty  c64.SCRATCH_ZPWORD1+1
-_enter		jsr  _numlen			; Y= slen
-		lda  #0
-		dey
-		bpl  +
-		rts
-+		lda  (c64.SCRATCH_ZPWORD1),y
-		sec
-		sbc  #'0'
-		dey
-		bpl  +
-		rts
-+		sta  c64.SCRATCH_ZPREG		;result
-		lda  (c64.SCRATCH_ZPWORD1),y
-		sec
-		sbc  #'0'
-		asl  a
-		sta  c64.SCRATCH_ZPB1
-		asl  a
-		asl  a
-		clc
-		adc  c64.SCRATCH_ZPB1
-		clc
-		adc  c64.SCRATCH_ZPREG
-		dey
-		bpl  +
-		rts
-+		sta  c64.SCRATCH_ZPREG
-		lda  (c64.SCRATCH_ZPWORD1),y
-		tay
-		lda  _hundreds-'0',y
-		clc
-		adc  c64.SCRATCH_ZPREG
-		rts
-_hundreds	.byte  0, 100, 200
-
-_numlen
-		;-- return the length of the numeric string at ZPWORD1, in Y
-		ldy  #0
--		lda  (c64.SCRATCH_ZPWORD1),y
-		cmp  #'0'
-		bmi  +
-		cmp  #':'	; one after '9'
-		bpl  +
 		iny
-		bne  -
++		cmp  #'-'
-+		rts
+		bne  _parse
-
+		inc  _negative
-	}}
+		iny
-}
+_parse		lda  (c64.SCRATCH_ZPWORD1),y
-
+		sec
-
+		sbc  #48
-asmsub	c64flt_FREADSTR	(ubyte length @ A) -> clobbers(A,X,Y) -> ()	= $b7b5		; @todo needed for (slow) str conversion below
+		bpl  _digit
-asmsub	c64flt_GETADR	() -> clobbers(X) -> (ubyte @ Y, ubyte @ A)	= $b7f7		; @todo needed for (slow) str conversion below
+_done		; return result
-asmsub	c64flt_FTOSWORDYA  () -> clobbers(X) -> (ubyte @ Y, ubyte @ A)	= $b1aa		; @todo needed for (slow) str conversion below
+		lda  _negative
-
-asmsub  str2uword(str string @ AY) -> clobbers() -> (uword @ AY) {
-	%asm {{
-		;-- convert string (address in A/Y) to uword number in A/Y
-		;   @todo don't use the (slow) kernel floating point conversion
-		sta  $22
-		sty  $23
-		jsr  _strlen2233
-		tya
-		stx  c64.SCRATCH_ZPREGX
-		jsr  c64flt_FREADSTR			; string to fac1
-		jsr  c64flt_GETADR			; fac1 to unsigned word in Y/A
-		ldx  c64.SCRATCH_ZPREGX
-		sta  c64.SCRATCH_ZPREG
-		tya
-		ldy  c64.SCRATCH_ZPREG
-		rts
-
-_strlen2233
-		;-- return the length of the (zero-terminated) string at $22/$23, in Y
-		ldy  #0
--		lda  ($22),y
 		beq  +
-		iny
+		sec
-		bne  -
+		lda  #0
-+		rts
+		sbc  _result
-	}}
+		sta  _result
-}
+		lda  #0
-
+		sbc  _result+1
-asmsub  str2word(str string @ AY) -> clobbers() -> (word @ AY) {
+		sta  _result+1
-	%asm {{
++		lda  _result
-		;-- convert string (address in A/Y) to signed word number in A/Y
+		ldy  _result+1
-		;   @todo don't use the (slow) kernel floating point conversion
-		sta  $22
-		sty  $23
-		jsr  str2uword._strlen2233
-		tya
-		stx  c64.SCRATCH_ZPREGX
-		jsr  c64flt_FREADSTR		; string to fac1
-		jsr  c64flt_FTOSWORDYA		; fac1 to unsigned word in Y/A
-		ldx  c64.SCRATCH_ZPREGX
-		sta  c64.SCRATCH_ZPREG
-		tya
-		ldy  c64.SCRATCH_ZPREG
 		rts
+_digit		cmp  #10
+		bcs  _done
+		; add digit to result
+		pha
+		jsr  str2uword._result_times_10
+		pla
+		clc
+		adc  _result
+		sta  _result
+		bcc  +
+		inc  _result+1
++		iny
+		bne  _parse
+		; never reached
+_negative	.byte  0
 	}}
 }
 
 
-; @todo string to 32 bit unsigned integer http://www.6502.org/source/strings/ascii-to-32bit.html
-
-
 asmsub  set_irqvec_excl() -> clobbers(A) -> ()  {
 	%asm {{
 		sei

compiler/src/prog8/ast/AstChecker.kt

@@ -727,12 +727,6 @@ private class AstChecker(private val namespace: INameScope,
     override fun process(typecast: TypecastExpression): IExpression {
         if(typecast.type in IterableDatatypes)
             checkResult.add(ExpressionError("cannot type cast to string or array type", typecast.position))
-        val funcTarget = (typecast.expression as? IFunctionCall)?.target?.targetStatement(namespace)
-        if(funcTarget is Subroutine &&
-                funcTarget.asmReturnvaluesRegisters.isNotEmpty() &&
-                funcTarget.asmReturnvaluesRegisters.all { it.stack!=true }) {
-            checkResult.add(ExpressionError("cannot type cast a call to an asmsub that returns value in register - use a variable to store it first", typecast.position))
-        }
         return super.process(typecast)
     }
 

compiler/src/prog8/compiler/Compiler.kt

@@ -1016,7 +1016,9 @@ internal class Compiler(private val rootModule: Module,
                     TODO("not yet supported: return values in cpu status flag $rv  $subroutine")
                 when(rv.registerOrPair) {
                     A,X,Y -> prog.instr(Opcode.PUSH_VAR_BYTE, callLabel = rv.registerOrPair.name)
-                    AX, AY, XY -> prog.instr(Opcode.PUSH_VAR_WORD, callLabel = rv.registerOrPair.name)
+                    AX -> prog.instr(Opcode.PUSH_REGAX_WORD)
+                    AY -> prog.instr(Opcode.PUSH_REGAY_WORD)
+                    XY -> prog.instr(Opcode.PUSH_REGXY_WORD)
                     null -> {}
                 }
             }
@@ -2146,13 +2148,6 @@ internal class Compiler(private val rootModule: Module,
     }
 
     private fun translate(expr: TypecastExpression) {
-        val funcTarget = (expr.expression as? IFunctionCall)?.target?.targetStatement(namespace)
-        if(funcTarget is Subroutine &&
-                funcTarget.asmReturnvaluesRegisters.isNotEmpty() &&
-                funcTarget.asmReturnvaluesRegisters.all { it.stack!=true }) {
-            throw CompilerException("cannot type cast a call to an asmsub that returns value in register - use a variable to store it first")
-        }
-
         translate(expr.expression)
         val sourceDt = expr.expression.resultingDatatype(namespace, heap) ?: throw CompilerException("don't know what type to cast")
         if(sourceDt==expr.type)

examples/numbergame.p8

@@ -29,7 +29,7 @@
                 c64scr.print("es")
             c64scr.print(" left.\nWhat is your next guess? ")
             c64scr.input_chars(input)
-            ubyte guess = c64utils.str2ubyte(input)
+            ubyte guess = lsb(c64utils.str2uword(input))
 
             if guess==secretnumber {
                 return ending(true)

examples/test.p8

@@ -7,9 +7,46 @@
 
     sub start() {
 
-        ubyte ub
+        uword z = c64utils.str2uword(" 1 2 3 4 5 ")
-        A = 123 or 44
+        c64scr.print_uw(c64utils.str2uword(" "))
-        Y = A or 1
+        c64.CHROUT('\n')
-        ub = ub or 1
+        c64scr.print_uw(c64utils.str2uword("  222 "))
+        c64.CHROUT('\n')
+        c64scr.print_uw(c64utils.str2uword("1234 567"))
+        c64.CHROUT('\n')
+        c64scr.print_uw(c64utils.str2uword("1234x567"))
+        c64.CHROUT('\n')
+        c64scr.print_uw(c64utils.str2uword("+1234x567"))
+        c64.CHROUT('\n')
+        c64scr.print_uw(c64utils.str2uword("00065534"))
+        c64.CHROUT('\n')
+        c64scr.print_uw(c64utils.str2uword("0006553x4"))
+        c64.CHROUT('\n')
+        c64.CHROUT('\n')
+
+        word z2 = c64utils.str2word(" 1 2 3 4 5 ")
+        c64scr.print_w(c64utils.str2word(" "))
+        c64.CHROUT('\n')
+        c64scr.print_w(c64utils.str2word("0000000"))
+        c64.CHROUT('\n')
+        c64scr.print_w(c64utils.str2word("12345"))
+        c64.CHROUT('\n')
+        c64scr.print_w(c64utils.str2word("64444"))
+        c64.CHROUT('\n')
+        c64scr.print_w(c64utils.str2word(" 12345"))
+        c64.CHROUT('\n')
+        c64scr.print_w(c64utils.str2word("-12345"))
+        c64.CHROUT('\n')
+        c64scr.print_w(c64utils.str2word(" - 123 45"))
+        c64.CHROUT('\n')
+        c64scr.print_w(c64utils.str2word("+1234 567 "))
+        c64.CHROUT('\n')
+        c64scr.print_w(c64utils.str2word("-1234 567 "))
+        c64.CHROUT('\n')
+        c64scr.print_w(c64utils.str2word("-31999"))
+        c64.CHROUT('\n')
+        c64scr.print_w(c64utils.str2word("31999"))
+        c64.CHROUT('\n')
     }
+
 }