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* [Bug target/20296] Speeding up small interrupts on avr
[not found] <bug-20296-4@http.gcc.gnu.org/bugzilla/>
@ 2011-11-06 20:40 ` wiml at hhhh dot org
2012-03-03 14:21 ` gjl at gcc dot gnu.org
2012-03-03 16:34 ` gjl at gcc dot gnu.org
2 siblings, 0 replies; 6+ messages in thread
From: wiml at hhhh dot org @ 2011-11-06 20:40 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20296
Wim Lewis <wiml at hhhh dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |wiml at hhhh dot org
--- Comment #2 from Wim Lewis <wiml at hhhh dot org> 2011-11-06 20:39:49 UTC ---
FWIW, confirming that versions 4.3.4 and 4.6.2 still emit these unnecessary
saves of r0 and r1 for small ISRs (the generated code is identical to what
berndtrog@yahoo.com posted, at least for optimization levels >= 1).
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/20296] Speeding up small interrupts on avr
[not found] <bug-20296-4@http.gcc.gnu.org/bugzilla/>
2011-11-06 20:40 ` [Bug target/20296] Speeding up small interrupts on avr wiml at hhhh dot org
@ 2012-03-03 14:21 ` gjl at gcc dot gnu.org
2012-03-03 16:34 ` gjl at gcc dot gnu.org
2 siblings, 0 replies; 6+ messages in thread
From: gjl at gcc dot gnu.org @ 2012-03-03 14:21 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20296
Georg-Johann Lay <gjl at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P2 |P5
CC| |gjl at gcc dot gnu.org
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/20296] Speeding up small interrupts on avr
[not found] <bug-20296-4@http.gcc.gnu.org/bugzilla/>
2011-11-06 20:40 ` [Bug target/20296] Speeding up small interrupts on avr wiml at hhhh dot org
2012-03-03 14:21 ` gjl at gcc dot gnu.org
@ 2012-03-03 16:34 ` gjl at gcc dot gnu.org
2 siblings, 0 replies; 6+ messages in thread
From: gjl at gcc dot gnu.org @ 2012-03-03 16:34 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20296
Georg-Johann Lay <gjl at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |SUSPENDED
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/20296] Speeding up small interrupts on avr
2005-03-02 23:47 [Bug target/20296] New: " berndtrog at yahoo dot com
2005-03-04 19:51 ` [Bug target/20296] " bjoern dot m dot haase at web dot de
2005-03-04 23:47 ` ericw at evcohs dot com
@ 2005-03-05 1:10 ` giovannibajo at libero dot it
2 siblings, 0 replies; 6+ messages in thread
From: giovannibajo at libero dot it @ 2005-03-05 1:10 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2005-03-05 01:10:40
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20296
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/20296] Speeding up small interrupts on avr
2005-03-02 23:47 [Bug target/20296] New: " berndtrog at yahoo dot com
2005-03-04 19:51 ` [Bug target/20296] " bjoern dot m dot haase at web dot de
@ 2005-03-04 23:47 ` ericw at evcohs dot com
2005-03-05 1:10 ` giovannibajo at libero dot it
2 siblings, 0 replies; 6+ messages in thread
From: ericw at evcohs dot com @ 2005-03-04 23:47 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |ericw at evcohs dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20296
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/20296] Speeding up small interrupts on avr
2005-03-02 23:47 [Bug target/20296] New: " berndtrog at yahoo dot com
@ 2005-03-04 19:51 ` bjoern dot m dot haase at web dot de
2005-03-04 23:47 ` ericw at evcohs dot com
2005-03-05 1:10 ` giovannibajo at libero dot it
2 siblings, 0 replies; 6+ messages in thread
From: bjoern dot m dot haase at web dot de @ 2005-03-04 19:51 UTC (permalink / raw)
To: gcc-bugs
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
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------- Additional Comments From bjoern dot m dot haase at web dot de 2005-03-04 19:51 -------
Hi,
IMHO everyone working on the avr back-end is aware of this problem. The
difficulty is, that the present architecture of the avr back-end does not
easily permit to improve this case: Every instruction pattern (like "multiply
two 16 bit integers" or "sign-extend a 16 bit variable to 32 bits") presently
is free to assume that may overwrite or change r0 and r1 unless it leaves the
"__zero_reg__" with 0 after finishing it's task.
Resolving this issue, IMHO, would require a major refactoring of the
back-end. ... IIUC the keyword is "replace all of the more complex instruction
patterns by RTL expressions."
I suggest to mark this bug as "desired enhancement".
Yours,
Björn
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20296
^ permalink raw reply [flat|nested] 6+ messages in thread
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[not found] <bug-20296-4@http.gcc.gnu.org/bugzilla/>
2011-11-06 20:40 ` [Bug target/20296] Speeding up small interrupts on avr wiml at hhhh dot org
2012-03-03 14:21 ` gjl at gcc dot gnu.org
2012-03-03 16:34 ` gjl at gcc dot gnu.org
2005-03-02 23:47 [Bug target/20296] New: " berndtrog at yahoo dot com
2005-03-04 19:51 ` [Bug target/20296] " bjoern dot m dot haase at web dot de
2005-03-04 23:47 ` ericw at evcohs dot com
2005-03-05 1:10 ` giovannibajo at libero dot it
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