Handle two\'s complement numbers.
SignExtend.cpp
- Committer:
- Owen
- Date:
- 2011-01-20
- Revision:
- 0:b495118be5a7
File content as of revision 0:b495118be5a7:
#include "mbed.h" #include "assert.h" int SignExtend( int value, const int bit_width ) { assert( ( bit_width > 1) && ( bit_width < (8*sizeof(int)) ) ); value &= ( (1<<(bit_width)) - 1 ); /* Clear out any extra MSB data */ if ( ( value & ( 1 << (bit_width-1) ) ) != 0 ) { /* value IS negative */ value -= (1<<bit_width); } return value; }