STATIC Compiler Directive

Abbreviation		None.
Arguments		None.
Default		REENTRANT
µVision		Options — C166 — Use Static Memory for Non—register Automatics.
Description		The STATIC directive instructs the C166 Compiler to use static memory locations for automatic variables (not parameters) that cannot be allocated to a CPU register. The generated code is not reentrant but code size is reduced and execution speed is improved. The C16x/ST10 microcontroller can access static variables directly in operations like ADD, AND, CMP, OR, SUB, and XOR. The MOV instruction accesses direct memory faster than stack-based memory.
See Also		REENTRANT
Example		stmt level source 1 #pragma reentrant 2 3 int rfunc (int i, int j) { 4 1 int array[10]; 5 1 6 1 array[i] = j; 7 1 return (array[j]); 8 1 } 9 10 #pragma static 11 12 int sfunc (int i, int j) { 13 1 int array[10]; 14 1 15 1 array[i] = j; 16 1 return (array[j]); 17 1 } ASSEMBLY LISTING OF GENERATED OBJECT CODE ; FUNCTION rfunc (BEGIN RMASK = @0x4070) ; SOURCE LINE # 3 ;---- Variable 'j' assigned to Register 'R9' ---- ;---- Variable 'i' assigned to Register 'R8' ---- 0000 06F0ECFF ADD R0,#0FFECH ; SOURCE LINE # 6 0004 F058 MOV R5,R8 0006 5C15 SHL R5,#01H 0008 F060 MOV R6,R0 000A F046 MOV R4,R6 000C 0045 ADD R4,R5 000E B894 MOV [R4],R9 ; SOURCE LINE # 7 0010 F049 MOV R4,R9 0012 5C14 SHL R4,#01H 0014 0064 ADD R6,R4 0016 A846 MOV R4,[R6] ; SOURCE LINE # 8 0018 06F01400 ADD R0,#014H 001C CB00 RET ; FUNCTION rfunc (END RMASK = @0x4070) ; FUNCTION sfunc (BEGIN RMASK = @0x4010) ; SOURCE LINE # 12 ;---- Variable 'j' assigned to Register 'R9' ---- ;---- Variable 'i' assigned to Register 'R8' ---- ; SOURCE LINE # 15 001E F048 MOV R4,R8 0020 5C14 SHL R4,#01H 0022 C4940000 MOV [R4+#array],R9 ; SOURCE LINE # 16 0026 F049 MOV R4,R9 0028 5C14 SHL R4,#01H 002A D4440000 MOV R4,[R4+#array] ; SOURCE LINE # 17 002E CB00 RET ; FUNCTION sfunc (END RMASK = @0x4010)