Mercury Bugs - mercury
|View Issue Details|
|ID||Project||Category||View Status||Date Submitted||Last Update|
|0000128||mercury||Bug||public||2010-01-14 18:19||2010-09-15 12:29|
|Priority||normal||Severity||minor||Reproducibility||have not tried|
|Target Version||Fixed in Version|
|Summary||0000128: merge_instmapping_delta_2: error merging var 20|
|Description||(This was originally reported by Michael Day on the mercury-bugs list; responses from|
zs are included below as well.)
The attached program triggers a compiler error when building with -O5:
Uncaught Mercury exception:
Software Error: instmap.m: Unexpected: merge_instmapping_delta_2: error merging var 20
It succeeds at lower optimisation levels. Tested with rotd-2009-10-08 and rotd-2008-01-30.
Date: Mon, 9 Nov 2009 17:43:53 +1100
From: Zoltan Somogyi <firstname.lastname@example.org>
To: Michael Day <email@example.com>
Subject: Re: merge_instmapping_delta_2: error merging var 20
On 09-Nov-2009, Michael Day <firstname.lastname@example.org> wrote:
> The attached program triggers a compiler error when building with -O5:
> Making Mercury/int3s/bug.int3
> Making Mercury/ints/bug.int
> Making Mercury/cs/bug.c
> Uncaught Mercury exception:
> Software Error: instmap.m: Unexpected: merge_instmapping_delta_2: error
> merging var 20
> It succeeds at lower optimisation levels. Tested with rotd-2009-10-08 and
It also succeeds with -O5 --no-loop-invariants, and the exception is thrown
*during* the loop invariants pass. I think that makes this Ralph's to fix.
> It also succeeds with -O5 --no-loop-invariants, and the exception is thrown
> *during* the loop invariants pass. I think that makes this Ralph's to fix.
Suits me! :)
The bug can be worked around by creating lots of little helper predicates, although it is a bit tedious.
We always build with -O5 rather than waiting until just before release, as it's very frustrating to suddenly be hit with an unexpected internal compiler error.
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|Attached Files|| bug.m (1,078) 2010-01-14 18:20|
|2010-01-14 18:19||juliensf||New Issue|
|2010-01-14 18:20||juliensf||File Added: bug.m|
|2010-09-14 19:47||zs||Status||new => assigned|
|2010-09-14 19:47||zs||Assigned To||=> zs|
|2010-09-15 12:29||zs||Note Added: 0000290|
|2010-09-15 12:29||zs||Status||assigned => resolved|
|2010-09-15 12:29||zs||Resolution||open => fixed|