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_ifv VariableA, ==, VariableB : ; Code to Execute if VariableA == VariableB _end
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Using these macros can be expanded to include an else condition for code that executes if the condition is not true:
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_ifv VariableA, ==, VariableB : ; Code to Execute if VariableA == VariableB _else : ; Code to Execute if VariableA != VariableB _end
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MACRO DEVELOPMENT
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TABLE 10.7 INVOCATION
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STRUCTURED PROGRAMMING MACRO INVOCATIONS DESCRIPTION
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_ifv Parm1, Condition, Parm2 _ifc Parm1, Condition, Parm2 _else
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Execute the following code if the two variables (Parm1 and Parm2) operated on with the Condition are true. _else following is optional, and the code following it will execute if the condition is false. Must have _end following. Execute the following code if the variable (Parm1) and constant (Parm2) operated on with the condition is true. _else following is optional, and the code following it will execute if the condition is false. Must have _end following. Execute the following code if the result of the previous _if macro was false. Execution before the _else jumps to the next _end macro. End the _if or _while macro invocation. If previous operation was _while , then jump back to _while macro. Execute the following code while the two variables (Parm1 and Parm2) operated on with the Condition are true. Must have _end following, which will cause execution to jump back to the _while macro. Execute the following code while the variable (Parm1) and constant (Parm2) operated on with the Condition are true. Must have _end following, which will cause execution to jump back to the _while macro. Start of do/until loop. Jump to previous _do if the variables (Parm1 and Parm2) operated on with Condition are false. Jump to previous _do if the variable (Parm1) and the constant (Parm2) operated on with Condition are false.
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_end _whilev Parm1, Condition, Parm2 _whilec Parm1, Condition, Parm2
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_do _untilv Parm1, Condition, Parm2 _untilc Parm1, Condition, Parm2
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TABLE 10.8 COMPARISON OPERATORS USED IN STRUCTURED PROGRAMMING MACROS CONDITION DESCRIPTION
== != > >= < <=
Equals Not equals Greater than Greater than or equals Less than Less than or equals
STRUCTURED PROGRAMMING MACROS
For these macros, I decided to use as close a label to actual programming structures as possible, which is why I used the standard names with the underscore character before them. There are ve aspects and features of the macro processor that have in uenced how these structured conditional execution macros were created. The rst is that you cannot distinguish between constants and variable addresses in a macro. When the macro is invoked, a variable address is passed to the macro instead of the variable label. This was probably done to simplify the effort in writing the macro processor. For this application, it means that either what the value types are must be speci ed explicitly or there must be a way of declaring variables so that they can be differentiated from constants. I looked at a number of different ways to tell the two types of values apart and found that I could not do it without changing how variables were declared, which would make the application code more complex. Because I could not tell the two different types of data apart, I decided to always make the rst parameter a variable and the second one a variable (v) or constant (c) depending on the character at the end of the macro. Interestingly enough, this conversion of data does not extend to nonalphanumeric characters. In the macros, the condition test is speci ed, and this is passed into the macro. I take advantage of this to avoid having to create multiple macros each with a different condition test. Inside the macro, I use this test condition parameter to determine what it actually is (there is no way of comparing nonnumeric values in the conditional assembly functions of the macro processor). For example, in the _ifv macro, to nd out what is the condition, I test the speci ed condition against different cases:
if (1 test 1) movf a, w subwf b, w btfss STATUS, Z else if (1 test 0) if (0 test 1) movf a, w subwf b, w btfsc STATUS, Z else if (1 test 1) movf b, w subwf a, w btfss STATUS, C else movf a, w subwf b, w btfsc STATUS, C endif endif else if (0 test 1) if (1 test 1 ) ; Check for ==
; ; ;
Zero Flag Set if True Check for != / > / >= Check for !=
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