Answer:
No. The print integer method works correctly only with 32-bit two's complement representation.
No. The print integer method works correctly only with 32-bit two's complement representation.
To print a floating point value to the SPIM monitor, use service 2 (for single precision) or service 3 (for double precision). To read a floating point value from the user, use service 6 (for single precision) or service 7 (for double precision). These notes deal mostly with single precision.
Here is the complete list of SPIM exception handler services. Each I/O method uses a specific format for data. The methods for double use an even-odd pair of registers.
| Service | Code in $v0 | Arguments | Returned Value |
|---|---|---|---|
| print integer | 1 | $a0 == integer | |
| print float | 2 | $f12 == float | |
| print double | 3 | ($f12, $f13) == double | |
| print string | 4 | $a0 == address of string | |
| read integer | 5 | $v0 ← integer | |
| read float | 6 | $f0 ← float | |
| read double | 7 | ($f0, $f1) ← double | |
| read string | 8 | $a0 == buffer address $a1 == buffer length | |
| allocate memory | 9 | $a0 == number of bytes | $v0 ← address |
| exit | 10 |
(Review: ) Into what register do you put the service code before
executing a syscall