* [Bug translator/2427] New: optimization imporvement
@ 2006-03-06 22:23 hunt at redhat dot com
2006-04-24 20:09 ` [Bug translator/2427] " fche at redhat dot com
2006-04-24 20:30 ` [Bug translator/2427] optimize away side-effect-free embedded-C functions fche at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: hunt at redhat dot com @ 2006-03-06 22:23 UTC (permalink / raw)
To: systemtap
In the syscall tapset, we do lots of things like
argstr = sprintf("%d, %s, %d", $fd,
_struct_sockaddr_u($uservaddr,$addrlen),$addrlen)
Now, if argstr is not used, the argstr assignment is still not optimized out. I
assume this is because the translator has no way of knowing what
_struct_sockaddr_u() is doing. Is there some way the translator could detect
that it is safe to optimize out or some way we could specify an attribute for
embedded functions to indicate this?
--
Summary: optimization imporvement
Product: systemtap
Version: unspecified
Status: NEW
Severity: enhancement
Priority: P3
Component: translator
AssignedTo: systemtap at sources dot redhat dot com
ReportedBy: hunt at redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=2427
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^ permalink raw reply [flat|nested] 3+ messages in thread* [Bug translator/2427] optimization imporvement 2006-03-06 22:23 [Bug translator/2427] New: optimization imporvement hunt at redhat dot com @ 2006-04-24 20:09 ` fche at redhat dot com 2006-04-24 20:30 ` [Bug translator/2427] optimize away side-effect-free embedded-C functions fche at redhat dot com 1 sibling, 0 replies; 3+ messages in thread From: fche at redhat dot com @ 2006-04-24 20:09 UTC (permalink / raw) To: systemtap ------- Additional Comments From fche at redhat dot com 2006-04-24 20:09 ------- Absent better ideas, will implement this with a Hack(tm). If an embedded-C function includes this string in its body: /* pure */ then the translator will consider eliding them if their results are unused. -- What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED Last reconfirmed|0000-00-00 00:00:00 |2006-04-24 20:09:51 date| | http://sourceware.org/bugzilla/show_bug.cgi?id=2427 ------- You are receiving this mail because: ------- You are the assignee for the bug, or are watching the assignee. ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug translator/2427] optimize away side-effect-free embedded-C functions 2006-03-06 22:23 [Bug translator/2427] New: optimization imporvement hunt at redhat dot com 2006-04-24 20:09 ` [Bug translator/2427] " fche at redhat dot com @ 2006-04-24 20:30 ` fche at redhat dot com 1 sibling, 0 replies; 3+ messages in thread From: fche at redhat dot com @ 2006-04-24 20:30 UTC (permalink / raw) To: systemtap -- What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|systemtap at sources dot |fche at redhat dot com |redhat dot com | Summary|optimization imporvement |optimize away side-effect- | |free embedded-C functions http://sourceware.org/bugzilla/show_bug.cgi?id=2427 ------- You are receiving this mail because: ------- You are the assignee for the bug, or are watching the assignee. ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2006-04-24 20:30 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2006-03-06 22:23 [Bug translator/2427] New: optimization imporvement hunt at redhat dot com 2006-04-24 20:09 ` [Bug translator/2427] " fche at redhat dot com 2006-04-24 20:30 ` [Bug translator/2427] optimize away side-effect-free embedded-C functions fche at redhat dot com
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