NEC V850E/MA1 User Manual page 107

[Related global optimization part]
• 1-bit set using bit or
int i;
i ^=1;
• 1-bit clear using bit and
i &= ~1;
• 1-bit not using bit xor
i ^= 1;
• 1-bit test using bit and
if(i & 1);
[Related optimization depending on model part]
Accessing the same variable in a different size
• Cast
• Mask
• Shift
Example
int i, *ip;
char c;
. .
.
c=*((char*)ip);
. .
.
c = 0xff & i;
. .
.
i = (i<<24) >>24;
(b) Restrictions in assembly language
For variables located in the big endian space, a quasi directive that secures an area of other than byte
size (.hword, .word, .float, .shword) cannot be used.
CHAPTER 4 BUS CONTROL FUNCTION
User's Manual U14359EJ4V0UM
107