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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CC78K4 датащи(PDF) 488 Page - NEC |
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CC78K4 датащи(HTML) 488 Page - NEC |
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488 / 523 page  CHAPTER 13 EFFECTIVE UTILIZATION OF COMPILER User’s Manual U15556EJ1V0UM 488 • Functions that do not use automatic variables Functions that do not use automatic variables should be defined as noauto functions. These functions will not output code for stack frame generation and their arguments will be passed to registers as much as possible. These functions help shorten object code and improve program execution speed. Remark For the definition of the noauto function (noauto int sub1 (int i)...), refer to 11.5 (5) noauto functions and 11.7.3 noauto function call interface. • Functions that use automatic variables If the saddr2 area can be used for a function that uses automatic variables, declare the function with the register storage class specifier. By this register declaration, the object declared as register will be allocated to a register. A program using registers operates faster than one using memory, and object code can be shortened as well. Remark For the definition of the register variable (register int i; ...), refer to 11.5 (2) Register variables. • Functions that use internal static variables If the saddr2 area can be used for a function that uses internal static variables, declare the function with _ _sreg or specify the -RS option. In the same way as with sreg variables, the object code can be shortened and the execution speed can be improved. When saddr1 area can be used as well as saddr2 area, the same effect can be achieved by declaring the function with _ _sreg1. Remark Refer to 11.5 (3) How to use saddr area. |
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