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* [Bug middle-end/43966] New: redundant checks not removed
@ 2010-05-03 6:18 hartmut dot schirmer at arcormail dot de
2010-05-03 6:19 ` [Bug middle-end/43966] " hartmut dot schirmer at arcormail dot de
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: hartmut dot schirmer at arcormail dot de @ 2010-05-03 6:18 UTC (permalink / raw)
To: gcc-bugs
On attached test case GCC keeps the index range checks in
Vector::getValue although they're always true due to loop conditions
# GNU C++ (GCC) version 4.5.0 (mingw32)
# options passed: -fpreprocessed yy5.ii -march=atom -mtune=atom -O2 -Wall
--
Summary: redundant checks not removed
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: hartmut dot schirmer at arcormail dot de
GCC build triplet: i686-pc-mingw32
GCC host triplet: i686-pc-mingw32
GCC target triplet: i686-pc-mingw32
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43966
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/43966] redundant checks not removed
2010-05-03 6:18 [Bug middle-end/43966] New: redundant checks not removed hartmut dot schirmer at arcormail dot de
@ 2010-05-03 6:19 ` hartmut dot schirmer at arcormail dot de
2010-05-03 6:19 ` hartmut dot schirmer at arcormail dot de
2010-05-03 9:59 ` [Bug tree-optimization/43966] redundant predicated checks not removed by VRP or jump-threading rguenth at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: hartmut dot schirmer at arcormail dot de @ 2010-05-03 6:19 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from hartmut dot schirmer at arcormail dot de 2010-05-03 06:19 -------
Created an attachment (id=20538)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20538&action=view)
Test case
foo() uses a get method without checks and is ok, checks not optimized away in
bar()
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43966
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/43966] redundant checks not removed
2010-05-03 6:18 [Bug middle-end/43966] New: redundant checks not removed hartmut dot schirmer at arcormail dot de
2010-05-03 6:19 ` [Bug middle-end/43966] " hartmut dot schirmer at arcormail dot de
@ 2010-05-03 6:19 ` hartmut dot schirmer at arcormail dot de
2010-05-03 9:59 ` [Bug tree-optimization/43966] redundant predicated checks not removed by VRP or jump-threading rguenth at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: hartmut dot schirmer at arcormail dot de @ 2010-05-03 6:19 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from hartmut dot schirmer at arcormail dot de 2010-05-03 06:19 -------
Created an attachment (id=20539)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20539&action=view)
Assembler listing
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43966
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/43966] redundant predicated checks not removed by VRP or jump-threading
2010-05-03 6:18 [Bug middle-end/43966] New: redundant checks not removed hartmut dot schirmer at arcormail dot de
2010-05-03 6:19 ` [Bug middle-end/43966] " hartmut dot schirmer at arcormail dot de
2010-05-03 6:19 ` hartmut dot schirmer at arcormail dot de
@ 2010-05-03 9:59 ` rguenth at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2010-05-03 9:59 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from rguenth at gcc dot gnu dot org 2010-05-03 09:59 -------
Well, this is another case where the predication by if (mData) makes this
hard to optimize. Not impossible, but hard.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
Status|UNCONFIRMED |NEW
Component|middle-end |tree-optimization
Ever Confirmed|0 |1
Keywords| |missed-optimization
Last reconfirmed|0000-00-00 00:00:00 |2010-05-03 09:59:47
date| |
Summary|redundant checks not removed|redundant predicated checks
| |not removed by VRP or jump-
| |threading
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43966
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2010-05-03 9:59 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2010-05-03 6:18 [Bug middle-end/43966] New: redundant checks not removed hartmut dot schirmer at arcormail dot de
2010-05-03 6:19 ` [Bug middle-end/43966] " hartmut dot schirmer at arcormail dot de
2010-05-03 6:19 ` hartmut dot schirmer at arcormail dot de
2010-05-03 9:59 ` [Bug tree-optimization/43966] redundant predicated checks not removed by VRP or jump-threading rguenth at gcc dot gnu dot org
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