* callee-saved registers
@ 2010-03-02 13:11 Mathieu Lacage
2010-03-02 15:55 ` Ian Lance Taylor
0 siblings, 1 reply; 2+ messages in thread
From: Mathieu Lacage @ 2010-03-02 13:11 UTC (permalink / raw)
To: gcc-help
hi,
I wonder if it's possible to ask gcc to generate code for a function
as if all registers were callee-saved. i.e., I would like to make sure
that my function does not touch _any_ register from the perspective of
the caller, independently from the abi calling convention. I could
write my own prologue/epilogue to save/restore all registers by hand
but it's not really a lot of fun...
Mathieu
--
Mathieu Lacage <mathieu.lacage@gmail.com>
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: callee-saved registers
2010-03-02 13:11 callee-saved registers Mathieu Lacage
@ 2010-03-02 15:55 ` Ian Lance Taylor
0 siblings, 0 replies; 2+ messages in thread
From: Ian Lance Taylor @ 2010-03-02 15:55 UTC (permalink / raw)
To: Mathieu Lacage; +Cc: gcc-help
Mathieu Lacage <mathieu.lacage@gmail.com> writes:
> I wonder if it's possible to ask gcc to generate code for a function
> as if all registers were callee-saved. i.e., I would like to make sure
> that my function does not touch _any_ register from the perspective of
> the caller, independently from the abi calling convention. I could
> write my own prologue/epilogue to save/restore all registers by hand
> but it's not really a lot of fun...
This is available on some targets via a function attribute, but it is
not available on all targets. E.g., for MIPS targets, see the
"interrupt" function attribute.
Ian
^ permalink raw reply [flat|nested] 2+ messages in thread
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