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* [Bug target/41076] [avr] pessimal code for logical OR of 8-bit fields
[not found] <bug-41076-4@http.gcc.gnu.org/bugzilla/>
@ 2011-05-16 14:36 ` gjl at gcc dot gnu.org
2011-09-11 21:02 ` gjl at gcc dot gnu.org
` (5 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: gjl at gcc dot gnu.org @ 2011-05-16 14:36 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41076
--- Comment #2 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-05-16 14:20:25 UTC ---
Author: gjl
Date: Mon May 16 14:20:19 2011
New Revision: 173792
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=173792
Log:
PR target/27663
PR target/41076
* config/avr/predicates.md (const_8_16_24_operand): New predicate.
* config/avr/avr.md ("*ior<mode>qi.byte0",
"*ior<mode>qi.byte1-3"): New define_insn_and_split patterns.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/avr/avr.md
trunk/gcc/config/avr/predicates.md
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug target/41076] [avr] pessimal code for logical OR of 8-bit fields
[not found] <bug-41076-4@http.gcc.gnu.org/bugzilla/>
2011-05-16 14:36 ` [Bug target/41076] [avr] pessimal code for logical OR of 8-bit fields gjl at gcc dot gnu.org
@ 2011-09-11 21:02 ` gjl at gcc dot gnu.org
2011-09-11 21:48 ` gjl at gcc dot gnu.org
` (4 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: gjl at gcc dot gnu.org @ 2011-09-11 21:02 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41076
Georg-Johann Lay <gjl at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2011-09-11
AssignedTo|unassigned at gcc dot |gjl at gcc dot gnu.org
|gnu.org |
Ever Confirmed|0 |1
--- Comment #3 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-09-11 20:59:28 UTC ---
Created attachment 25242
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25242
Some test cases
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug target/41076] [avr] pessimal code for logical OR of 8-bit fields
[not found] <bug-41076-4@http.gcc.gnu.org/bugzilla/>
2011-05-16 14:36 ` [Bug target/41076] [avr] pessimal code for logical OR of 8-bit fields gjl at gcc dot gnu.org
2011-09-11 21:02 ` gjl at gcc dot gnu.org
@ 2011-09-11 21:48 ` gjl at gcc dot gnu.org
2012-03-22 8:34 ` rguenth at gcc dot gnu.org
` (3 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: gjl at gcc dot gnu.org @ 2011-09-11 21:48 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41076
Georg-Johann Lay <gjl at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|avr-elf |avr
Priority|P3 |P4
Version|unknown |4.6.1
Target Milestone|--- |4.7.0
Severity|normal |enhancement
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug target/41076] [avr] pessimal code for logical OR of 8-bit fields
[not found] <bug-41076-4@http.gcc.gnu.org/bugzilla/>
` (2 preceding siblings ...)
2011-09-11 21:48 ` gjl at gcc dot gnu.org
@ 2012-03-22 8:34 ` rguenth at gcc dot gnu.org
2012-07-02 13:53 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-03-22 8:34 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41076
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.7.0 |4.7.1
--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-03-22 08:26:23 UTC ---
GCC 4.7.0 is being released, adjusting target milestone.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug target/41076] [avr] pessimal code for logical OR of 8-bit fields
[not found] <bug-41076-4@http.gcc.gnu.org/bugzilla/>
` (3 preceding siblings ...)
2012-03-22 8:34 ` rguenth at gcc dot gnu.org
@ 2012-07-02 13:53 ` rguenth at gcc dot gnu.org
2013-01-22 22:31 ` gjl at gcc dot gnu.org
2014-02-17 16:35 ` gjl at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-07-02 13:53 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41076
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-02 13:52:40 UTC ---
Fixed I suppose.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug target/41076] [avr] pessimal code for logical OR of 8-bit fields
[not found] <bug-41076-4@http.gcc.gnu.org/bugzilla/>
` (4 preceding siblings ...)
2012-07-02 13:53 ` rguenth at gcc dot gnu.org
@ 2013-01-22 22:31 ` gjl at gcc dot gnu.org
2014-02-17 16:35 ` gjl at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: gjl at gcc dot gnu.org @ 2013-01-22 22:31 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41076
Georg-Johann Lay <gjl at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |
Target Milestone|4.7.1 |---
Severity|enhancement |normal
--- Comment #6 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2013-01-22 22:31:11 UTC ---
(In reply to comment #5)
> Fixed I suppose.
Unfortunately, not
extern unsigned char read8 (void);
unsigned short read16 (void)
{
unsigned char lo, hi;
hi = read8();
lo = read8();
return lo | hi << 8;
}
with 4.8.0 -S -Os the compiler needs 5 instructions (29, 37, 30, 38) for an
operation that is basically a no-op:
read16:
push r28 ; 31 pushqi1/1 [length = 1]
/* prologue: function */
/* frame size = 0 */
/* stack size = 1 */
.L__stack_usage = 1
call read8 ; 5 call_value_insn/2 [length = 2]
mov r28,r24 ; 6 movqi_insn/1 [length = 1]
call read8 ; 7 call_value_insn/2 [length = 2]
mov r18,r28 ; 28 movqi_insn/1 [length = 1]
ldi r19,0 ; 29 movqi_insn/1 [length = 1]
mov r19,r18 ; 37 *ashlhi3_const/3 [length = 2]
clr r18
or r18,r24 ; 30 iorqi3/1 [length = 1]
movw r24,r18 ; 38 *movhi/1 [length = 1]
/* epilogue start */
pop r28 ; 34 popqi [length = 1]
ret ; 35 return_from_epilogue [length = 1]
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug target/41076] [avr] pessimal code for logical OR of 8-bit fields
[not found] <bug-41076-4@http.gcc.gnu.org/bugzilla/>
` (5 preceding siblings ...)
2013-01-22 22:31 ` gjl at gcc dot gnu.org
@ 2014-02-17 16:35 ` gjl at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: gjl at gcc dot gnu.org @ 2014-02-17 16:35 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41076
Georg-Johann Lay <gjl at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |matthijs at stdin dot nl
--- Comment #7 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
*** Bug 60145 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug target/41076] [avr] pessimal code for logical OR of 8-bit fields
2009-08-15 7:43 [Bug target/41076] New: " pb at gcc dot gnu dot org
@ 2009-08-15 9:55 ` rguenth at gcc dot gnu dot org
0 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2009-08-15 9:55 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from rguenth at gcc dot gnu dot org 2009-08-15 09:55 -------
because this is what C says you are doing:
return (unsigned short) ((int) a | ((int) b << 8));
which is harder to transform back into what you expect.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41076
^ permalink raw reply [flat|nested] 8+ messages in thread
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[not found] <bug-41076-4@http.gcc.gnu.org/bugzilla/>
2011-05-16 14:36 ` [Bug target/41076] [avr] pessimal code for logical OR of 8-bit fields gjl at gcc dot gnu.org
2011-09-11 21:02 ` gjl at gcc dot gnu.org
2011-09-11 21:48 ` gjl at gcc dot gnu.org
2012-03-22 8:34 ` rguenth at gcc dot gnu.org
2012-07-02 13:53 ` rguenth at gcc dot gnu.org
2013-01-22 22:31 ` gjl at gcc dot gnu.org
2014-02-17 16:35 ` gjl at gcc dot gnu.org
2009-08-15 7:43 [Bug target/41076] New: " pb at gcc dot gnu dot org
2009-08-15 9:55 ` [Bug target/41076] " rguenth at gcc dot gnu dot org
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