[Bug target/19329] [3.4 Regression] Miscompilation with bitfields
--- Additional Comments From bjoern dot m dot haase at web dot de 2005-01-18 23:35 --- I have the impression that Bug #19329 is the same as bug #19239 (as one might think already when looking at the similarity of the numbers :-) ) 19239, howeverr so far has addressed the issue of *negative* and other really illegal shift counts. In a patch treating both problems correctly, one should possibly implement both: Treatment of negative and other illegal shift counts and positive shift counts. Yours, Björn. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19329
[Bug target/19329] [3.4 Regression] Miscompilation with bitfields
--- Additional Comments From bjoern dot m dot haase at web dot de 2005-01-18 23:43 --- Sorry for this: In my posting above, I have misspelled the bug number. I wanted to refer you to bug #19293 (and not #19239, luckyly the number of possible permutations is countable). By the way at #19293, you will also find a patch suggestion that should be eaysily adapted to all of the present shifting problems. Yours again, Björn -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19329
[Bug target/19329] [3.4 Regression] Miscompilation with bitfields
--- Additional Comments From bernie at develer dot com 2005-01-19 00:03 --- (In reply to comment #11) By the way at #19293, you will also find a patch suggestion that should be eaysily adapted to all of the present shifting problems. I agree PR19293 is a superset of this bug, so I'll close it and withdraw my (already approved) patch. Could you update your patch with a test for = 0? Please post it in gcc-patches, with me and Marek Michalkiewicz [EMAIL PROTECTED] in Cc. I will take care to install your patch in CVS as soon as it gets approved. *** This bug has been marked as a duplicate of 19293 *** -- What|Removed |Added Status|ASSIGNED|RESOLVED Resolution||DUPLICATE http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19329
[Bug target/19329] [3.4 Regression] Miscompilation with bitfields
--- Additional Comments From giovannibajo at libero dot it 2005-01-08 17:47 --- Created an attachment (id=7898) -- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=7898action=view) Testcase to reproduce the bug -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19329
[Bug target/19329] [3.4 Regression] Miscompilation with bitfields
--- Additional Comments From giovannibajo at libero dot it 2005-01-08 17:48 --- Created an attachment (id=7899) -- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=7899action=view) Generated assembly code (with bug!) -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19329
[Bug target/19329] [3.4 Regression] Miscompilation with bitfields
--- Additional Comments From giovannibajo at libero dot it 2005-01-08 17:50 --- Compiler details: Reading specs from /usr/local/avr/lib/gcc/avr/3.4.2/specs Configured with: ../gcc-3.4.2/configure --host=i686-pc-linux-gnu -- prefix=/usr/local/avr --target=avr --enable-languages=c : (reconfigured) ../gcc- 3.4.2/configure --host=i686-pc-linux-gnu --prefix=/usr/local/avr --target=avr -- enable-languages=c,c++ Thread model: single gcc version 3.4.2 -- What|Removed |Added Severity|normal |critical Known to fail||3.4.2 Known to work||4.0.0 Target Milestone|--- |3.4.4 Version|unknown |3.4.2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19329
[Bug target/19329] [3.4 Regression] Miscompilation with bitfields
--- Additional Comments From bernie at develer dot com 2005-01-08 17:57 --- Also fails with this pre-release version: avr-gcc (GCC) 3.4.3 20041019 (prerelease) Copyright (C) 2004 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Bootstrapping today's mainline right now. -- What|Removed |Added Known to fail|3.4.2 |3.4.2 3.4.3 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19329
[Bug target/19329] [3.4 Regression] Miscompilation with bitfields
-- What|Removed |Added CC||pinskia at gcc dot gnu dot ||org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19329
[Bug target/19329] [3.4 Regression] Miscompilation with bitfields
--- Additional Comments From pinskia at gcc dot gnu dot org 2005-01-08
18:52 ---
clr r25 ; 46 ashlqi3/4 [length = 1]
(insn 46 65 49 (set (reg:QI 25 r25 [66])
(ashift:QI (reg:QI 25 r25 [66])
(const_int 0 [0x0]))) 57 {ashlqi3} (nil)
(nil))
So there are two problems here, one a target problem in that it should not be
generating a clr for this
insn. Two this insn should not be here but that just a misoptimization.
--
What|Removed |Added
Severity|critical|normal
Status|UNCONFIRMED |NEW
Ever Confirmed||1
Priority|P2 |P3
Last reconfirmed|-00-00 00:00:00 |2005-01-08 18:52:50
date||
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19329
[Bug target/19329] [3.4 Regression] Miscompilation with bitfields
--- Additional Comments From giovannibajo at libero dot it 2005-01-08 19:17 --- Bernardo's working on a patch. -- What|Removed |Added AssignedTo|unassigned at gcc dot gnu |bernie at develer dot com |dot org | Status|NEW |ASSIGNED http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19329
[Bug target/19329] [3.4 Regression] Miscompilation with bitfields
--- Additional Comments From pinskia at gcc dot gnu dot org 2005-01-08 21:19 --- The shift with zero comes from regmove. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19329
[Bug target/19329] [3.4 Regression] Miscompilation with bitfields
--- Additional Comments From pinskia at gcc dot gnu dot org 2005-01-09 02:13 --- Patch posted here: http://gcc.gnu.org/ml/gcc-patches/2005-01/msg00454.html. -- What|Removed |Added Keywords||patch http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19329
