Owen Edwards / TwosComplement

Handle two\'s complement numbers.

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Show/hide line numbers SignExtend.cpp Source File

SignExtend.cpp

00001 #include "mbed.h"
00002 #include "assert.h"
00003 
00004 int SignExtend( int value, const int bit_width )
00005 {
00006     assert( ( bit_width > 1) && ( bit_width < (8*sizeof(int)) ) );
00007 
00008     value &= ( (1<<(bit_width)) - 1 ); /* Clear out any extra MSB data */
00009 
00010     if ( ( value & ( 1 << (bit_width-1) ) ) != 0 )
00011     {
00012         /* value IS negative */
00013         value -= (1<<bit_width);
00014     }
00015 
00016     return value;
00017 }
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