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Hey all, Now that we have sign/zero extensions, have people given thought to the elimination of these? There's a paper I downloaded a few years ago called "Effective Sign Extension Elimination" by M. Kawahito, H. Komatsu, and T. Nakatani. I only have a dead tree copy of it, though. But I can share it as much as I can. -bw

On Thu, 4 Jan 2007, Bill Wendling wrote: > Now that we have sign/zero extensions, have people given thought to > the elimination of these? There's a paper I downloaded a few years > ago called "Effective Sign Extension Elimination" by M. Kawahito, H. > Komatsu, and T. Nakatani. Sign extension elimination is most useful in the backend, when targeting processors like PowerPC that have a single register width (e.g. 32-bits). We already do quite a bit of sign extension removal in the dag combiner, but this is limited to a single basic bl...

...Chris Lattner wrote: > On Thu, 4 Jan 2007, Bill Wendling wrote: >> Now that we have sign/zero extensions, have people given thought to >> the elimination of these? There's a paper I downloaded a few years >> ago called "Effective Sign Extension Elimination" by M. Kawahito, H. >> Komatsu, and T. Nakatani. > > Sign extension elimination is most useful in the backend, when > targeting > processors like PowerPC that have a single register width (e.g. 32- > bits). > We already do quite a bit of sign extension removal in the dag > combiner,...