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Re: [tree-ssa] Remove useless null pointer checks
- From: Jason Merrill <jason at redhat dot com>
- To: law at redhat dot com
- Cc: Jeff Sturm <jsturm at one-point dot com>, gcc-patches at gcc dot gnu dot org
- Date: Thu, 31 Jul 2003 13:46:46 -0400
- Subject: Re: [tree-ssa] Remove useless null pointer checks
- References: <200307311715.h6VHF6sI005550@speedy.slc.redhat.com>
On Thu, 31 Jul 2003 11:15:06 -0600, law@redhat.com wrote:
> In message <wvl65liaal7.fsf@prospero.boston.redhat.com>, Jason Merrill writes:
> >On Wed, 30 Jul 2003 21:18:55 -0600, law@redhat.com wrote:
> >
> >> However, once we deal with the NOP_EXPR issues in a sane way
> >
> >FYI, I hope to deal with that today.\
> Funny -- I think I've come up with a set of rules for the dominator
> optimizer which should make it immune to most of this stuff.
Great.
> Note that simply removing the typecasts can actually be a step backwards
> in terms of exposing stuff to the optimizer. I found that when I
> started looking real closely at stripping out unwanted NOP_EXPRs in
> the gimplifier.
Can you elaborate?
Jason