MPLAB C Compiler for PIC24 MCUs and dsPIC DSCs ... - Microchip

16-Bit C Compiler User’s Guide
__builtin_sac
Assembler Operator
/ Machine
Instruction:
sac
Error Messages An error message will be displayed if:
• the result is not an accumulator register
• the shift value is not a literal within range
__builtin_sacr
Description: Shifts value by shift (a literal between -8 and 7) and returns the value
which is rounded using the rounding mode determined by the
CORCONbits.RND control bit.
For example:
register int value asm("A");
int result;
result = __builtin_sac(value,3);
Might generate:
sac.r A, #3, w0
Prototype: int __builtin_sacr(int value, int shift);
Argument: valueInteger number to be shifted.
shiftLiteral amount to shift.
Return Value: Returns the shifted result to CORCON register.
Assembler Opera- sacr
tor / Machine
Instruction:
Error Messages An error message will be displayed if:
• the result is not an accumulator register
• the shift value is not a literal within range
__builtin_sftac
Description: Shifts accumulator by shift. The valid shift range is -16 to 16.
For example:
register int result asm("A");
int i;
result = __builtin_sftac(i);
Might generate:
sftac A, w0
Prototype: int __builtin_sftac(int shift);
Argument: shiftLiteral amount to shift.
Return Value: Returns the shifted result to an accumulator.
Assembler Opera- sftac
tor / Machine
Instruction:
Error Messages An error message will be displayed if:
• the result is not an accumulator register
• the shift value is not a literal within range
DS51284G-page 158 © 2008 Microchip Technology Inc.