On May 14, 2005, BjÃrn Haase <[EMAIL PROTECTED]> wrote: > I.e. expand > would insert two instructions after the double-set instruction that contain > the two individual sets and an additional "use" statement. I.e. above > sequence after expand then would look like
> (parallel[ > (set reg:SI 100) (minus:SI (reg:SI 101) (reg:SI 102)) > (set reg:CC CC_xxx) (compare (reg:SI 101) (reg:SI 102)))]) > (parallel[ (set reg:SI 100) (minus:SI (reg:SI 101) (reg:SI 102)) > (use (reg:SI 100) ]) > (parallel[ (set reg:CC_xxx CC) (compare (reg:SI 101) (reg:SI 102))) > (use (reg:CC]) You'd then have to some how arrange for the second and third insns to not be removed as redundant, and come up with some additional work around for the case when there's an overlap between output and input. -- Alexandre Oliva http://www.ic.unicamp.br/~oliva/ Red Hat Compiler Engineer [EMAIL PROTECTED], gcc.gnu.org} Free Software Evangelist [EMAIL PROTECTED], gnu.org}
