The TUNE option specifies the architecture for which the executable
program will be optimized. This option allows the optimizer to take
advantage of architectural differences such as scheduling of instructions.

.-5-.
>>-TUNE--(--+-n-+--)-------------------------------------------><
Note:
If TUNE level is lower than ARCH, TUNE is forced
to ARCH.
The current values that may be specified for the TUNE level are:
- 5
- Generates code that is executable on all models but is optimized
for the models specified under ARCH(5).
- 6
- Generates code that is executable on all models but is optimized
for the models specified under ARCH(6).
- 7
- Generates code that is executable on all models but is optimized
for the models specified under ARCH(7).
- 8
- Generates code that is executable on all models but is optimized
for the models specified under ARCH(8).
If you specify a TUNE value less
than 5, the compiler will reset it to 5.
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