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* Re: optimization/7269: Inlining may not eliminate unnecessary tests and branches.
@ 2002-10-06 21:36 Andrew Pinski
0 siblings, 0 replies; 4+ messages in thread
From: Andrew Pinski @ 2002-10-06 21:36 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR optimization/7269; it has been noted by GNATS.
From: Andrew Pinski <pinskia@physics.uc.edu>
To: gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org, anamax@earthlink.net,
gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org
Cc:
Subject: Re: optimization/7269: Inlining may not eliminate unnecessary tests and branches.
Date: Sun, 6 Oct 2002 21:35:24 -0700
Do you have a simple sample which shows this?
Thanks,
Andrew Pinski
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-
trail&database=gcc&pr=7269
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: optimization/7269: Inlining may not eliminate unnecessary tests and branches.
@ 2003-02-19 14:56 Andy Freeman
0 siblings, 0 replies; 4+ messages in thread
From: Andy Freeman @ 2003-02-19 14:56 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR optimization/7269; it has been noted by GNATS.
From: "Andy Freeman" <anamax@earthlink.net>
To: <ebotcazou@gcc.gnu.org>,
<anamax@earthlink.net>,
<gcc-bugs@gcc.gnu.org>,
<gcc-prs@gcc.gnu.org>,
<nobody@gcc.gnu.org>,
<gcc-gnats@gcc.gnu.org>
Cc:
Subject: Re: optimization/7269: Inlining may not eliminate unnecessary tests and branches.
Date: Wed, 19 Feb 2003 06:43:40 -0800
I'm no longer in a position to produce the code.
The specific example looked like:
struct foo {
int f(int i) {
... // no branches or returns
if( 0 = i ) {
return 17;
}
...
}
};
int bar(...) {
foo f;
if( f.f(0) ) { // the branch in f was eliminated by constant propagation
.... // but the branch testing f's return value was not.
}
}
----- Original Message -----
From: <ebotcazou@gcc.gnu.org>
To: <anamax@earthlink.net>; <gcc-bugs@gcc.gnu.org>; <gcc-prs@gcc.gnu.org>; <nobody@gcc.gnu.org>
Sent: Wednesday, February 19, 2003 1:26 AM
Subject: Re: optimization/7269: Inlining may not eliminate unnecessary tests and branches.
> Synopsis: Inlining may not eliminate unnecessary tests and branches.
>
> State-Changed-From-To: open->feedback
> State-Changed-By: ebotcazou
> State-Changed-When: Wed Feb 19 09:26:14 2003
> State-Changed-Why:
> Sample code requested for 5 months.
>
> http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7269
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: optimization/7269: Inlining may not eliminate unnecessary tests and branches.
@ 2003-02-19 9:26 ebotcazou
0 siblings, 0 replies; 4+ messages in thread
From: ebotcazou @ 2003-02-19 9:26 UTC (permalink / raw)
To: anamax, gcc-bugs, gcc-prs, nobody
Synopsis: Inlining may not eliminate unnecessary tests and branches.
State-Changed-From-To: open->feedback
State-Changed-By: ebotcazou
State-Changed-When: Wed Feb 19 09:26:14 2003
State-Changed-Why:
Sample code requested for 5 months.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7269
^ permalink raw reply [flat|nested] 4+ messages in thread
* optimization/7269: Inlining may not eliminate unnecessary tests and branches.
@ 2002-07-10 22:36 anamax
0 siblings, 0 replies; 4+ messages in thread
From: anamax @ 2002-07-10 22:36 UTC (permalink / raw)
To: gcc-gnats
>Number: 7269
>Category: optimization
>Synopsis: Inlining may not eliminate unnecessary tests and branches.
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: pessimizes-code
>Submitter-Id: net
>Arrival-Date: Wed Jul 10 22:36:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Andy Freeman
>Release: gcc 3.1
>Organization:
>Environment:
Redhat 7.3
>Description:
Inlined procedures may have unnnecessary tests and branches.
Using built-in specs.
Configured with: ../gcc-3.1/configure
Thread model: single
gcc version 3.1
>How-To-Repeat:
The -S -O3 output has a branch to a compare&branch whose behavior is invariant. The "je .L4" should/can be "je .L1".
>Fix:
Better constant value propagation
>Release-Note:
>Audit-Trail:
>Unformatted:
^ permalink raw reply [flat|nested] 4+ messages in thread
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2002-10-06 21:36 optimization/7269: Inlining may not eliminate unnecessary tests and branches Andrew Pinski
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2003-02-19 14:56 Andy Freeman
2003-02-19 9:26 ebotcazou
2002-07-10 22:36 anamax
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