Bugs item #1692649, was opened at 2007-04-02 05:51 Message generated for change (Comment added) made by stffn You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=478070&aid=1692649...
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: pd-extended Group: v0.39.2 Status: Pending Resolution: Postponed Priority: 5 Private: No Submitted By: Hans-Christoph Steiner (eighthave) Assigned to: Hans-Christoph Steiner (eighthave) Summary: sqrt~ giving only -inf/inf
Initial Comment:
For the G4 and Intel optimized builds of Pd-0.39.2-extended-test7 on Mac OS X, sqrt~ only returns -inf or inf. (Does this affect other platforms?) This is probably related to the auto-vectorization. This is not a problem on Pd-0.39.2-extended-test7 that was built for G3s.
Check the sqrt~-help.pd file for a test patch.
sqrt~ of the signal 9 returns -\infty, hence not 3 as expected. All tried int signals greater then zero returns -\infty. To test this, see either the attached patch (which is very close to the help-patch for [sqrt~]) or the help-patch for [sqrt~].
See also: http://lists.puredata.info/pipermail/pd-list/2007-01/046266.html
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Comment By: stffn (stffn) Date: 2007-06-12 14:18
Message: Logged In: YES user_id=1658640 Originator: NO
In the autobuild from 12th of june it now works on mac-intel (macbook core duo), but - sadly - not on powerpc (ibook G4). Both running Mac OS 10.4.9.
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Comment By: Hans-Christoph Steiner (eighthave) Date: 2007-06-12 06:26
Message: Logged In: YES user_id=27104 Originator: YES
I removed these from the compiler flags and it seems to have fixed the problem on Intel Macs:
-ftree-vectorize -ftree-vectorizer-verbose=2
Please confirm that this is fixed in both Intel and PowerPC.
This thread discusses the root causes of why the auto-vectorization causes this problem:
http://lists.puredata.info/pipermail/pd-dev/2007-04/008689.html
Ideally the root of the problem would be fixed so that we can use auto-vectorization.
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Comment By: stffn (stffn) Date: 2007-05-05 15:11
Message: Logged In: YES user_id=1658640 Originator: NO
Still present in the nightly build of RC2 from 5th of May. It does however work in the test build of .040.2-extended of the same date.
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Comment By: frey (freynz) Date: 2007-04-18 14:06
Message: Logged In: YES user_id=1772500 Originator: NO
I have this same problem with pd-0.39.2-extended-rc2 on my Intel MacBook.
It doesn't appear in Miller's vanilla pd-0.40-2, on the same machine.
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Comment By: Hans-Christoph Steiner (eighthave) Date: 2007-04-02 06:08
Message: Logged In: YES user_id=27104 Originator: YES
d_math.c, where sqrt.c isn't auto-vectorized, so this is probably caused by a different optimization flag. Or maybe it's related to these warnings:
d_math.c: In function 'init_rsqrt': d_math.c:79: warning: dereferencing type-punned pointer will break strict-aliasing rules d_math.c: In function 'q8_rsqrt': d_math.c:93: warning: dereferencing type-punned pointer will break strict-aliasing rules d_math.c: In function 'q8_sqrt': d_math.c:101: warning: dereferencing type-punned pointer will break strict-aliasing rules
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