Björn Haase wrote:
misses therefore a lot of optimizations. I am presently trying to remove the
define_insn for the HImode and SImode operations by implementing the lowering
to QImode at expand or at least after reload (for those operations that leave
the condition code in a useable state like a
James E Wilson wrote:
> You were never very clear about what was wrong with gen_highpart and
> gen_lowpart with respect to subregs. rtl examples are always helpful,
> e.g. showing RTL input and RTL output and pointing out what is wrong.
> gen_lowpart already has support for subreg input and presu
Björn Haase wrote:
So far, I now think that the solution of the issue would be to extend
gen_lowpart and gen_highpart so that they are able to handle also subreg
inputs and use them at all places that emmit RTL (i.e. expand and split).
Question is whether I should try to simultaneously implement
Thank you for your answer!
Am Donnerstag, 21. April 2005 05:11 schrieb James E Wilson:
> Björn Haase wrote:
> > The mid-end seems not to be able to simplify nested subreg expressions.
> > I.e. it seems that there is no known transformation
> >(subreg:QI (subreg:HI (reg:SI xx) 0) 0)
>
> Nested
Björn Haase wrote:
The mid-end seems not to be able to simplify nested subreg expressions. I.e.
it seems that there is no known transformation
(subreg:QI (subreg:HI (reg:SI xx) 0) 0)
Nested subregs aren't valid. You should refrain from creating them.
(define_expand "xorhi3"
[(set (subreg:QI
