On Mon, Jul 4, 2011 at 4:54 PM, Alan Modra <amo...@gmail.com> wrote: > On Mon, Jul 04, 2011 at 01:57:34PM -0700, H.J. Lu wrote: >> forward_propagate_subreg issue was introduced by >> >> http://gcc.gnu.org/ml/gcc-patches/2009-08/msg01203.html >> >> Before that, fwprop never tries to work on hard registers. > > I question this claim. It seems to me that fwprop did look at > paradoxical subregs of hard regs before my change.
I should have said " fwprop never tries to work on zero/sign-extended hard registers." >> Alan, >> is your change to process hard registers intentional? > > I didn't set out to do anything special with hard regs one way or the > other, just extended what was already done for paradoxical subregs to > sign and zero extended subregs. > Does your change depend on processing zero/sign-extended hard registers? -- H.J.
