Andrew
at 17.11.2010 12:30, Andrew wrote:
> 17.11.2010 12:03, Erich Titl пишет:
>> Hi Folks
>>
>> I am attempting to build openswan for BuC4 and I am worried a bit about
>> the environment preset in MasteriInclude.mk.
>>
>> We define GNU_TUNE as pentiumpro, which according to the gcc doc should
>> produce code for this kind of architecture, whereas GNU_ARCH is set to
>> I486 which definitely is not a pentium pro.
>>
> No, you're miss about this. Key difference between arch & tune - arch
> specifies target CPU, for which code is generated (which instruction set
> will be used in executable), and tune - specifies for which architecture
> code will be optimized; on other architectures code will work but
> possible some less effective.
Right, that is what I read from the gcc manual:
-mtune=cpu-type
Tune to cpu-type everything applicable about the generated code,
except for the ABI and the set of available instructions. The choices
for cpu-type are:
....
And here is what the manual sais about -march
-march=cpu-type
Generate instructions for the machine type cpu-type. The choices for
cpu-type are the same as for -mtune. Moreover, specifying
-march=cpu-type implies -mtune=cpu-type.
And this reads to me that, whatever you do in -mtune, if you specify
-march then it is automatically overwritten.
And then it does not make sense.
cheers
Erich
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