PPC64 Compiler bug !!

Alan Modra amodra at bigpond.net.au
Fri Jun 13 15:09:28 EST 2003

On Fri, Jun 13, 2003 at 12:50:17AM -0400, David Edelsohn wrote:
> >>>>> linas  writes:
> linas> Assuming that someone provided a patch to do this, would the rs6000
> linas> maintainers turn it down?
> 	Yes, any such patch will be rejected.
> 	Customers, especially in the embedded space, do not want
> "discourage use of FPRs for DImode", they want "promise to not use any
> FPRs in an integer-only function".  GCC cannot accomplish that safely in
> the target-specific portion of the compiler.

But we do want "discourage use of FPRs for DImode".  User code will
incur an exception on first use of a FPR.  That means GPRs are cheaper
to use than FPRs for moving blocks of memory under Linux.

Alan Modra
IBM OzLabs - Linux Technology Centre

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