Efficient C for ARM
C Data Types
Certain C data types are more efficient to use for local variables than others.
- ARM has 32-bit wide registers and 32-bit data processing instructions.
Therefore the machine’s natural word type, int, is
32-bit.
| C Data Type | Implementation |
|---|---|
char |
unsigned 8-bit byte |
short |
signed 16-bit halfword |
int |
signed 32-bit word |
long |
signed 32-bit word |
long long |
signed 64-bit double word |
