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Re: [PATCH] Fix PR68067

From: Jeff Law <law at redhat dot com>
To: Richard Biener <rguenther at suse dot de>, Alan Lawrence <alan dot lawrence at arm dot com>
Cc: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Date: Fri, 6 Nov 2015 09:11:01 -0700
Subject: Re: [PATCH] Fix PR68067
Authentication-results: sourceware.org; auth=none
References: <alpine dot LSU dot 2 dot 11 dot 1510271340060 dot 28064 at zhemvz dot fhfr dot qr> <alpine dot LSU dot 2 dot 11 dot 1510271526510 dot 28064 at zhemvz dot fhfr dot qr> <alpine dot LSU dot 2 dot 11 dot 1510281437450 dot 28064 at zhemvz dot fhfr dot qr> <563C817D dot 1060107 at arm dot com> <alpine dot LSU dot 2 dot 11 dot 1511061136580 dot 10078 at zhemvz dot fhfr dot qr> <563C9BDA dot 9080002 at arm dot com> <alpine dot LSU dot 2 dot 11 dot 1511061325320 dot 10078 at zhemvz dot fhfr dot qr>

On 11/06/2015 05:26 AM, Richard Biener wrote:

On Fri, 6 Nov 2015, Alan Lawrence wrote:

On 06/11/15 10:39, Richard Biener wrote:

../spec2000/benchspec/CINT2000/254.gap/src/polynom.c:358:11: error:
location
references block not in block tree
l1_279 = PHI <1(28), l1_299(33)>


^^^

this is the error to look at!  It means that the GC heap will be corrupted
quite easily.


Thanks, I'll have a go at that.

-fdump-tree-alias is also suspicious, hinting that that does more than just
print. (How many bugs here??)


Well, it only allocates some more heap memory for extra debug verbosity.
I think this can happen with other dumps as well.

Right. Anytime a -fdump-whatever changes behaviour, there's usuallysome underlying memory issue elsewhere it's tickling.


jeff

References:
- Re: [PATCH] Fix PR68067
  - From: Alan Lawrence
- Re: [PATCH] Fix PR68067
  - From: Richard Biener
- Re: [PATCH] Fix PR68067
  - From: Alan Lawrence
- Re: [PATCH] Fix PR68067
  - From: Richard Biener

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