[sdcc-devel] [ sdcc-Bugs-3160401 ] (val + 2) & 0x1 always even?

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Bugs item #3160401, was opened at 2011-01-18 00:46
Message generated for change (Tracker Item Submitted) made by hpoetzl
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Category: pic16 target
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Herbert Pötzl (hpoetzl)
Assigned to: Nobody/Anonymous (nobody)
Summary: (val + 2) & 0x1 always even?

Initial Comment:
basically loop for (val=0; val<16; val++) and output to pin (led) like this: 
LED_PIN = val & 0x1; results in blinking led while
LED_PIN = (val + 2) & 0x1; results in dark led

code generated looks complicated and strange ...
compiled with --use-non-free -mpic16 -p18f26j50

--- bug01_good.asm	2011-01-18 01:41:44.000000000 +0100
+++ bug01_bad.asm	2011-01-18 01:41:32.000000000 +0100
@@ -466,10 +466,16 @@ _00112_DS_:
 	MOVLW	0x10
 	SUBWF	r0x00, W
 	BC	_00116_DS_
-;	.line	35; bug01.c	LED_PIN = val & 0x1;
+;	.line	37; bug01.c	LED_PIN = (val + 2) & 0x1;
+	MOVFF	r0x00, r0x01
+	CLRF	r0x02
+	MOVLW	0x02
+	ADDWF	r0x01, F
+	BTFSC	STATUS, 0
+	INCF	r0x02, F
 	MOVLW	0x01
-	ANDWF	r0x00, W
-	MOVWF	r0x01
+	ANDWF	r0x01, F
+	CLRF	r0x02
 	MOVF	r0x01, W
 	ANDLW	0x01
 	MOVWF	PRODH


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