On Thu, Aug 26, 2021 at 9:57 AM Gary Oblock <g...@amperecomputing.com> wrote: > > Richard, > > It sure looked a label but I had code that would bail out on > a label before it ever got where I was seeing a problem. > > I finally printed out the gimple code and it was a GIMPLE_DEBUG! > When I bailed out on debugs my pass worked again. Of course > expanding debugging info failed in cfgexpand. It looks like "-g" > and my stuff real don't play nice together. Any thoughts on > what to do? I'm thing about simply disabling my stuff if "-g" > is specified. This is not the macho thing to do but anything is likely > a very deep rathole.
For analysis you should ignore GIMPLE_DEBUG. During transform you should transform debugs like other stmts - if you run into debug stmts that you can't transform because you didn't analyze them and doing so would have changed analysis/transform the reasonable thing to do is to reset them (gimple_debug_bind_reset_value). The only "special" thing about the debug stmts is that they do not have GIMPLE-like RHS but instead they have GENERIC trees on the RHS. Richard. > > Thanks, > > Gary > > > ________________________________ > From: Richard Biener <richard.guent...@gmail.com> > Sent: Thursday, August 26, 2021 12:45 AM > To: Gary Oblock <g...@amperecomputing.com> > Cc: gcc@gcc.gnu.org <gcc@gcc.gnu.org> > Subject: Re: What is this GIMPLE? > > [EXTERNAL EMAIL NOTICE: This email originated from an external sender. Please > be mindful of safe email handling and proprietary information protection > practices.] > > > On Wed, Aug 25, 2021 at 7:30 AM Gary Oblock via Gcc <gcc@gcc.gnu.org> wrote: > > > > I print out a bit of GIMPLE for a program and it looks like this: > > > > <bb 3> [local count: 13634385]: > > # a_1 = PHI <a_320(D)(2), a_318(118)> > > # n_11 = PHI <n_321(D)(2), n_319(118)> > > loop: > > # DEBUG n => n_11 > > # DEBUG a => a_1 > > _2 = (long unsigned int) a_1; > > _3 = _2 & 7; > > _347 = _3 != 0; > > > > That bit that says "loop:" isn't a GIMPLE_LABEL and > > it has operands, the first of which is "size_t n = size_t;" > > and I find that a bit odd... > > I'm sure it is a GIMPLE_LABEL. > > > What is this thing and what does it do? Note, I'm trying to > > parse and transform some GIMPLE and this is confusing my > > code (and me.) I looked in the internals doc and grepped the > > code but I'm still in the dark. > > > > Note,I'd like be able to detect and ignore this if it's just informational. > > > > Thanks, > > > > Gary > > > > Gary > > > > > > CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, is > > for the sole use of the intended recipient(s) and contains information that > > is confidential and proprietary to Ampere Computing or its subsidiaries. It > > is to be used solely for the purpose of furthering the parties' business > > relationship. Any unauthorized review, copying, or distribution of this > > email (or any attachments thereto) is strictly prohibited. If you are not > > the intended recipient, please contact the sender immediately and > > permanently delete the original and any copies of this email and any > > attachments thereto.
