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comparison code_part1/OSTC_code_asm_part1/math.asm @ 354:cec312042b94

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Fix sub16 neg detect (related to bug #44)
author JeanDo
date Tue, 07 Jun 2011 03:55:27 +0200
parents 06299199dfb9
children 07f5b0baaa57
comparison
equal deleted inserted replaced
353:b5b030c1ae7e 354:cec312042b94
52 movwf sub_c+0 52 movwf sub_c+0
53 movf sub_b+1, W ; Get the Value to be Subbed 53 movf sub_b+1, W ; Get the Value to be Subbed
54 subwfb sub_a+1, W 54 subwfb sub_a+1, W
55 movwf sub_c+1 55 movwf sub_c+1
56 56
57 btfsc STATUS,C 57 btfss STATUS,N ; Negativ result ?
58 return ; result positve 58 return ; NO: result positive done.
59 59
60 bsf neg_flag ; result negative 60 bsf neg_flag ; MARK result negative
61 61
62 comf sub_c+1 ; 16bit sign change. 62 comf sub_c+1 ; 16bit sign change.
63 negf sub_c+0 63 negf sub_c+0
64 btfsc STATUS,C ; Carry to propagate ? 64 btfsc STATUS,C ; Carry to propagate ?
65 incf sub_c+1,F ; YES: do it. 65 incf sub_c+1,F ; YES: do it.