* [Bug translator/4567] New: optimizer changes results by removing complex statement
@ 2007-05-30 12:14 masami dot hiramatsu dot pt at hitachi dot com
2007-05-30 13:00 ` [Bug translator/4567] " fche at redhat dot com
0 siblings, 1 reply; 2+ messages in thread
From: masami dot hiramatsu dot pt at hitachi dot com @ 2007-05-30 12:14 UTC (permalink / raw)
To: systemtap
I found the optimizer can change the results and
behaviors.
For example,
----
1 global array
2
3 function func(i) {
4 array[i++] = 0;
5 return i;
6 }
7
8 probe begin {
9 printf("%d\n", func(0));
10 exit();
11 }
----
This script's output is expected as 1.
However I ran it without -u option, I got 0.
So, I ran it again with -u option. Then I got 1.
I tested it by using systemtap-20070519.
I think the optimizer should treat these complex
statement as a series of single statements.
Thanks,
--
Summary: optimizer changes results by removing complex statement
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: translator
AssignedTo: systemtap at sources dot redhat dot com
ReportedBy: masami dot hiramatsu dot pt at hitachi dot com
CC: soshima at redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=4567
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* [Bug translator/4567] optimizer changes results by removing complex statement
2007-05-30 12:14 [Bug translator/4567] New: optimizer changes results by removing complex statement masami dot hiramatsu dot pt at hitachi dot com
@ 2007-05-30 13:00 ` fche at redhat dot com
0 siblings, 0 replies; 2+ messages in thread
From: fche at redhat dot com @ 2007-05-30 13:00 UTC (permalink / raw)
To: systemtap
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|systemtap at sources dot |fche at redhat dot com
|redhat dot com |
Status|NEW |ASSIGNED
http://sourceware.org/bugzilla/show_bug.cgi?id=4567
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You are the assignee for the bug, or are watching the assignee.
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2007-05-30 12:14 [Bug translator/4567] New: optimizer changes results by removing complex statement masami dot hiramatsu dot pt at hitachi dot com
2007-05-30 13:00 ` [Bug translator/4567] " fche at redhat dot com
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