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* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
       [not found] <bug-33049-4@http.gcc.gnu.org/bugzilla/>
@ 2011-05-17 19:11 ` gjl at gcc dot gnu.org
  2011-05-17 19:24 ` gjl at gcc dot gnu.org
                   ` (10 subsequent siblings)
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From: gjl at gcc dot gnu.org @ 2011-05-17 19:11 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33049

--- Comment #10 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-05-17 18:57:39 UTC ---
Created attachment 24264
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24264
Proposed patch.

Proposed Patch (also compatible with older versions of GCC).

The insn needs at most 3 instructions and does not put pressure on d-regs.

* config/avr/avr.md ("*extzv"): New insn.


^ permalink raw reply	[flat|nested] 21+ messages in thread
* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
       [not found] <bug-33049-4@http.gcc.gnu.org/bugzilla/>
  2011-05-17 19:11 ` [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem gjl at gcc dot gnu.org
@ 2011-05-17 19:24 ` gjl at gcc dot gnu.org
  2011-05-18  8:26 ` gjl at gcc dot gnu.org
                   ` (9 subsequent siblings)
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From: gjl at gcc dot gnu.org @ 2011-05-17 19:24 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33049

--- Comment #11 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-05-17 19:00:05 UTC ---
Created attachment 24265
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24265
Assembler output from 4.7.0 (r173832) with patch applied.

Assembler output from 4.7.0 (r173832) with patch applied.

There's not much room for improvement left now.


^ permalink raw reply	[flat|nested] 21+ messages in thread
* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
       [not found] <bug-33049-4@http.gcc.gnu.org/bugzilla/>
  2011-05-17 19:11 ` [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem gjl at gcc dot gnu.org
  2011-05-17 19:24 ` gjl at gcc dot gnu.org
@ 2011-05-18  8:26 ` gjl at gcc dot gnu.org
  2011-05-19 10:57 ` wvangulik at xs4all dot nl
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From: gjl at gcc dot gnu.org @ 2011-05-18  8:26 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33049

--- Comment #12 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-05-18 08:06:53 UTC ---
Created attachment 24277
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24277
Proposed patch

Patch that is less fuzzy in its attributes.


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* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
       [not found] <bug-33049-4@http.gcc.gnu.org/bugzilla/>
                   ` (2 preceding siblings ...)
  2011-05-18  8:26 ` gjl at gcc dot gnu.org
@ 2011-05-19 10:57 ` wvangulik at xs4all dot nl
  2011-05-30 14:48 ` gjl at gcc dot gnu.org
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From: wvangulik at xs4all dot nl @ 2011-05-19 10:57 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33049

Wouter van Gulik <wvangulik at xs4all dot nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |

--- Comment #13 from Wouter van Gulik <wvangulik at xs4all dot nl> 2011-05-19 10:38:38 UTC ---
Yep it looks a lot better now.
The if statements could be optimized into the equivalent shift instructions but
that is not a AVR backend problem I guess.
I noticed that the disassembly shows wrong lengths for some outputs of extzv.
Is that a problem?


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* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
       [not found] <bug-33049-4@http.gcc.gnu.org/bugzilla/>
                   ` (3 preceding siblings ...)
  2011-05-19 10:57 ` wvangulik at xs4all dot nl
@ 2011-05-30 14:48 ` gjl at gcc dot gnu.org
  2011-06-17 21:39 ` gcc at emailgo dot de
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From: gjl at gcc dot gnu.org @ 2011-05-30 14:48 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33049

Georg-Johann Lay <gjl at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gjl at gcc dot gnu.org

--- Comment #14 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-05-30 14:33:31 UTC ---
(In reply to comment #13)
> Yep it looks a lot better now.
> The if statements could be optimized into the equivalent shift instructions but
> that is not a AVR backend problem I guess.

Shifting generally is more expensive instead of bit extracting; at least if the
bit offset is known at compile time.

> I noticed that the disassembly shows wrong lengths for some outputs of extzv.
> Is that a problem?

It's not a problem if the sequence actually printed is not greater than the
instruction length reported. If the reported instruction length was strinct
greater, an assembler error could occur because relative jump offets migh be
out of scope.

The only case where the instruction length is smaller than reported is if
IN_REG=OUT_REG and BITPOS=4 (sequence is swap + andi 1). The instruction length
for lsr + andi 1 (IN_REG=OUT_REG, BITPOS=1) is already corrected in the patch.


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* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
       [not found] <bug-33049-4@http.gcc.gnu.org/bugzilla/>
                   ` (4 preceding siblings ...)
  2011-05-30 14:48 ` gjl at gcc dot gnu.org
@ 2011-06-17 21:39 ` gcc at emailgo dot de
  2011-06-20 10:52 ` gjl at gcc dot gnu.org
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From: gcc at emailgo dot de @ 2011-06-17 21:39 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33049

HotHead <gcc at emailgo dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gcc at emailgo dot de

--- Comment #15 from HotHead <gcc at emailgo dot de> 2011-06-17 21:38:20 UTC ---
*** Bug 49446 has been marked as a duplicate of this bug. ***


^ permalink raw reply	[flat|nested] 21+ messages in thread
* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
       [not found] <bug-33049-4@http.gcc.gnu.org/bugzilla/>
                   ` (5 preceding siblings ...)
  2011-06-17 21:39 ` gcc at emailgo dot de
@ 2011-06-20 10:52 ` gjl at gcc dot gnu.org
  2011-06-20 10:59 ` gjl at gcc dot gnu.org
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From: gjl at gcc dot gnu.org @ 2011-06-20 10:52 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33049

--- Comment #16 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-06-20 10:50:27 UTC ---
*** Bug 49446 has been marked as a duplicate of this bug. ***


^ permalink raw reply	[flat|nested] 21+ messages in thread
* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
       [not found] <bug-33049-4@http.gcc.gnu.org/bugzilla/>
                   ` (6 preceding siblings ...)
  2011-06-20 10:52 ` gjl at gcc dot gnu.org
@ 2011-06-20 10:59 ` gjl at gcc dot gnu.org
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From: gjl at gcc dot gnu.org @ 2011-06-20 10:59 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33049

Georg-Johann Lay <gjl at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot       |gjl at gcc dot gnu.org
                   |gnu.org                     |

--- Comment #17 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-06-20 10:58:59 UTC ---
Created attachment 24563
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24563
pr33049.diff

Patch also covering PR49446.

Tested without regression against SVN 175201

    PR target/33049
    * config/avr/avr.md (extzv): New expander.
    (*extzv, *extzv.qihi1, *extzv.qihi2): New insn-and-split.


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* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
       [not found] <bug-33049-4@http.gcc.gnu.org/bugzilla/>
                   ` (7 preceding siblings ...)
  2011-06-20 10:59 ` gjl at gcc dot gnu.org
@ 2011-06-20 11:02 ` gjl at gcc dot gnu.org
  2011-06-21 17:32 ` gjl at gcc dot gnu.org
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From: gjl at gcc dot gnu.org @ 2011-06-20 11:02 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33049

Georg-Johann Lay <gjl at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.7.0


^ permalink raw reply	[flat|nested] 21+ messages in thread
* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
       [not found] <bug-33049-4@http.gcc.gnu.org/bugzilla/>
                   ` (8 preceding siblings ...)
  2011-06-20 11:02 ` gjl at gcc dot gnu.org
@ 2011-06-21 17:32 ` gjl at gcc dot gnu.org
  2011-06-21 17:38 ` gjl at gcc dot gnu.org
  2011-09-18 12:35 ` gjl at gcc dot gnu.org
  11 siblings, 0 replies; 21+ messages in thread
From: gjl at gcc dot gnu.org @ 2011-06-21 17:32 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33049

--- Comment #18 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-06-21 17:30:57 UTC ---
Author: gjl
Date: Tue Jun 21 17:30:54 2011
New Revision: 175269

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=175269
Log:
    PR target/33049
    * config/avr/avr.md (extzv): New expander.
    (*extzv): New insn.
    (*extzv.qihi1, *extzv.qihi2): New insn-and-split.
    * config/avr/constraints.md (C04): New constraint.
    * doc/md.texi (Machine Constraints): Document it.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/avr/avr.md
    trunk/gcc/config/avr/constraints.md
    trunk/gcc/doc/md.texi


^ permalink raw reply	[flat|nested] 21+ messages in thread
* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
       [not found] <bug-33049-4@http.gcc.gnu.org/bugzilla/>
                   ` (9 preceding siblings ...)
  2011-06-21 17:32 ` gjl at gcc dot gnu.org
@ 2011-06-21 17:38 ` gjl at gcc dot gnu.org
  2011-09-18 12:35 ` gjl at gcc dot gnu.org
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From: gjl at gcc dot gnu.org @ 2011-06-21 17:38 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33049

Georg-Johann Lay <gjl at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #19 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-06-21 17:36:35 UTC ---
Closing as resolved+fixed according to applied patch.


^ permalink raw reply	[flat|nested] 21+ messages in thread
* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
       [not found] <bug-33049-4@http.gcc.gnu.org/bugzilla/>
                   ` (10 preceding siblings ...)
  2011-06-21 17:38 ` gjl at gcc dot gnu.org
@ 2011-09-18 12:35 ` gjl at gcc dot gnu.org
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From: gjl at gcc dot gnu.org @ 2011-09-18 12:35 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33049

--- Comment #20 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-09-18 12:22:58 UTC ---
See also http://lists.gnu.org/archive/html/avr-gcc-list/2008-12/msg00009.html


^ permalink raw reply	[flat|nested] 21+ messages in thread
* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
  2007-08-11 17:53 [Bug c/33049] New: AVR: " wvangulik at xs4all dot nl
                   ` (7 preceding siblings ...)
  2010-09-14  6:23 ` abnikant dot singh at atmel dot com
@ 2010-09-14  6:25 ` abnikant dot singh at atmel dot com
  8 siblings, 0 replies; 21+ messages in thread
From: abnikant dot singh at atmel dot com @ 2010-09-14  6:25 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #9 from abnikant dot singh at atmel dot com  2010-09-14 06:25 -------
Lot better code size in gcc-4.5.0 and above [head]. See the attachment in
comment #8.


-- 

abnikant dot singh at atmel dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |abnikant dot singh at atmel
                   |                            |dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33049


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* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
  2007-08-11 17:53 [Bug c/33049] New: AVR: " wvangulik at xs4all dot nl
                   ` (6 preceding siblings ...)
  2007-08-24 20:36 ` eweddington at cso dot atmel dot com
@ 2010-09-14  6:23 ` abnikant dot singh at atmel dot com
  2010-09-14  6:25 ` abnikant dot singh at atmel dot com
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From: abnikant dot singh at atmel dot com @ 2010-09-14  6:23 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #8 from abnikant dot singh at atmel dot com  2010-09-14 06:23 -------
Created an attachment (id=21787)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21787&action=view)
Test case assembler output for 4.5.0.


-- 


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* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
  2007-08-11 17:53 [Bug c/33049] New: AVR: " wvangulik at xs4all dot nl
                   ` (5 preceding siblings ...)
  2007-08-24 20:35 ` eweddington at cso dot atmel dot com
@ 2007-08-24 20:36 ` eweddington at cso dot atmel dot com
  2010-09-14  6:23 ` abnikant dot singh at atmel dot com
  2010-09-14  6:25 ` abnikant dot singh at atmel dot com
  8 siblings, 0 replies; 21+ messages in thread
From: eweddington at cso dot atmel dot com @ 2007-08-24 20:36 UTC (permalink / raw)
  To: gcc-bugs



-- 

eweddington at cso dot atmel dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |missed-optimization
      Known to fail|                            |4.1.2 4.2.1 4.3.0
   Last reconfirmed|0000-00-00 00:00:00         |2007-08-24 20:35:53
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33049


^ permalink raw reply	[flat|nested] 21+ messages in thread
* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
  2007-08-11 17:53 [Bug c/33049] New: AVR: " wvangulik at xs4all dot nl
                   ` (4 preceding siblings ...)
  2007-08-24 20:30 ` eweddington at cso dot atmel dot com
@ 2007-08-24 20:35 ` eweddington at cso dot atmel dot com
  2007-08-24 20:36 ` eweddington at cso dot atmel dot com
                   ` (2 subsequent siblings)
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From: eweddington at cso dot atmel dot com @ 2007-08-24 20:35 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #7 from eweddington at cso dot atmel dot com  2007-08-24 20:35 -------
Created an attachment (id=14108)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14108&action=view)
Test case assembler output for 4.3.0 20070817 snapshot.

Again, only marginally better.


-- 


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^ permalink raw reply	[flat|nested] 21+ messages in thread
* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
  2007-08-11 17:53 [Bug c/33049] New: AVR: " wvangulik at xs4all dot nl
                   ` (3 preceding siblings ...)
  2007-08-24 20:25 ` eweddington at cso dot atmel dot com
@ 2007-08-24 20:30 ` eweddington at cso dot atmel dot com
  2007-08-24 20:35 ` eweddington at cso dot atmel dot com
                   ` (3 subsequent siblings)
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From: eweddington at cso dot atmel dot com @ 2007-08-24 20:30 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #6 from eweddington at cso dot atmel dot com  2007-08-24 20:30 -------
Created an attachment (id=14107)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14107&action=view)
Test case assembler output for 4.2.1.

Not really any better than 4.1.2.


-- 


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^ permalink raw reply	[flat|nested] 21+ messages in thread
* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
  2007-08-11 17:53 [Bug c/33049] New: AVR: " wvangulik at xs4all dot nl
                   ` (2 preceding siblings ...)
  2007-08-24 18:52 ` wvangulik at xs4all dot nl
@ 2007-08-24 20:25 ` eweddington at cso dot atmel dot com
  2007-08-24 20:30 ` eweddington at cso dot atmel dot com
                   ` (4 subsequent siblings)
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From: eweddington at cso dot atmel dot com @ 2007-08-24 20:25 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #5 from eweddington at cso dot atmel dot com  2007-08-24 20:25 -------
Created an attachment (id=14106)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14106&action=view)
Correct assembler output of test case for 4.1.2.


-- 

eweddington at cso dot atmel dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #14105|0                           |1
        is obsolete|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33049


^ permalink raw reply	[flat|nested] 21+ messages in thread
* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
  2007-08-11 17:53 [Bug c/33049] New: AVR: " wvangulik at xs4all dot nl
  2007-08-11 17:58 ` [Bug target/33049] " pinskia at gcc dot gnu dot org
  2007-08-22 16:58 ` [Bug target/33049] [avr] " eweddington at cso dot atmel dot com
@ 2007-08-24 18:52 ` wvangulik at xs4all dot nl
  2007-08-24 20:25 ` eweddington at cso dot atmel dot com
                   ` (5 subsequent siblings)
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From: wvangulik at xs4all dot nl @ 2007-08-24 18:52 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #4 from wvangulik at xs4all dot nl  2007-08-24 18:52 -------
Created an attachment (id=14105)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14105&action=view)
Assembler output of testcase using 4.1.2

This is the requested assembler output that Eric asked for


-- 


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^ permalink raw reply	[flat|nested] 21+ messages in thread
* [Bug target/33049] [avr] bit extraction non optimal, inversing logic solves problem
  2007-08-11 17:53 [Bug c/33049] New: AVR: " wvangulik at xs4all dot nl
  2007-08-11 17:58 ` [Bug target/33049] " pinskia at gcc dot gnu dot org
@ 2007-08-22 16:58 ` eweddington at cso dot atmel dot com
  2007-08-24 18:52 ` wvangulik at xs4all dot nl
                   ` (6 subsequent siblings)
  8 siblings, 0 replies; 21+ messages in thread
From: eweddington at cso dot atmel dot com @ 2007-08-22 16:58 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #3 from eweddington at cso dot atmel dot com  2007-08-22 16:57 -------
Wouter, please attach the assembly output that you are getting for your test.c
file using 4.1.2. That way we can compare it to other compiler versions.

Thanks,
Eric


-- 


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^ permalink raw reply	[flat|nested] 21+ messages in thread
* [Bug target/33049] AVR: bit extraction non optimal, inversing logic solves problem
  2007-08-11 17:53 [Bug c/33049] New: AVR: " wvangulik at xs4all dot nl
@ 2007-08-11 17:58 ` pinskia at gcc dot gnu dot org
  2007-08-22 16:58 ` [Bug target/33049] [avr] " eweddington at cso dot atmel dot com
                   ` (7 subsequent siblings)
  8 siblings, 0 replies; 21+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2007-08-11 17:58 UTC (permalink / raw)
  To: gcc-bugs



------- Comment #2 from pinskia at gcc dot gnu dot org  2007-08-11 17:58 -------
It might be interesting if you tried 4.2.1.


-- 


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^ permalink raw reply	[flat|nested] 21+ messages in thread
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2007-08-11 17:53 [Bug c/33049] New: AVR: " wvangulik at xs4all dot nl
2007-08-11 17:58 ` [Bug target/33049] " pinskia at gcc dot gnu dot org
2007-08-22 16:58 ` [Bug target/33049] [avr] " eweddington at cso dot atmel dot com
2007-08-24 18:52 ` wvangulik at xs4all dot nl
2007-08-24 20:25 ` eweddington at cso dot atmel dot com
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2007-08-24 20:35 ` eweddington at cso dot atmel dot com
2007-08-24 20:36 ` eweddington at cso dot atmel dot com
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