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* [Bug middle-end/23666] New: Fold does not reduce C - ~a into a + (C+1)
@ 2005-09-01 1:42 pinskia at gcc dot gnu dot org
2005-09-01 6:20 ` [Bug middle-end/23666] " falk at debian dot org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-09-01 1:42 UTC (permalink / raw)
To: gcc-bugs
The asm for the following two functions should be the same.
int f(int a)
{
return 10 - ~a;
}
int f1(int a)
{
return a + 11;
}
Found while reading LLVM's instruction combiner.
--
Summary: Fold does not reduce C - ~a into a + (C+1)
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P2
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
OtherBugsDependingO 19987
nThis:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23666
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/23666] Fold does not reduce C - ~a into a + (C+1)
2005-09-01 1:42 [Bug middle-end/23666] New: Fold does not reduce C - ~a into a + (C+1) pinskia at gcc dot gnu dot org
@ 2005-09-01 6:20 ` falk at debian dot org
2005-09-01 12:00 ` pinskia at gcc dot gnu dot org
2005-09-17 2:11 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: falk at debian dot org @ 2005-09-01 6:20 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From falk at debian dot org 2005-09-01 06:19 -------
Works for me on alphaev68-unknown-linux-gnu
tiw with 4.1.0 20050819.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23666
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/23666] Fold does not reduce C - ~a into a + (C+1)
2005-09-01 1:42 [Bug middle-end/23666] New: Fold does not reduce C - ~a into a + (C+1) pinskia at gcc dot gnu dot org
2005-09-01 6:20 ` [Bug middle-end/23666] " falk at debian dot org
@ 2005-09-01 12:00 ` pinskia at gcc dot gnu dot org
2005-09-17 2:11 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-09-01 12:00 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-09-01 11:59 -------
(In reply to comment #1)
> Works for me on alphaev68-unknown-linux-gnu
> tiw with 4.1.0 20050819.
And does not with 4.1.0 20050901 on i686-pc-linux-gnu or on powerpc-darwin.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23666
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/23666] Fold does not reduce C - ~a into a + (C+1)
2005-09-01 1:42 [Bug middle-end/23666] New: Fold does not reduce C - ~a into a + (C+1) pinskia at gcc dot gnu dot org
2005-09-01 6:20 ` [Bug middle-end/23666] " falk at debian dot org
2005-09-01 12:00 ` pinskia at gcc dot gnu dot org
@ 2005-09-17 2:11 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-09-17 2:11 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-09-17 02:11 -------
Confirmed.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2005-09-17 02:11:51
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23666
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-09-17 2:11 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2005-09-01 1:42 [Bug middle-end/23666] New: Fold does not reduce C - ~a into a + (C+1) pinskia at gcc dot gnu dot org
2005-09-01 6:20 ` [Bug middle-end/23666] " falk at debian dot org
2005-09-01 12:00 ` pinskia at gcc dot gnu dot org
2005-09-17 2:11 ` pinskia at gcc dot gnu dot org
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