Do not spill variables/registers on the stack

[Drasko DRASKOVIC]

On Wed, Feb 2, 2011 at 7:08 PM, Jeff Law <law@redhat.com> wrote:
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> On 02/02/11 10:34, Philip Herron wrote:
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>>
>> I am not quite sure what you are asking/trying to do but the register
>> keyword is used to tell the compiler keep this variable inside any
>> available registers which is useful if your going to use it alot in a
>> piece of code i would imagine it could speed up things alot.
> GCC ignores the "register" keyword.

1) Why would it ignore it ?
2) When does it ignore it ? When -O0 ? In some other cases ?
3) Is there some way to force "register" keyword not to be ignored with -O0 ?

BR,
Drasko