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* [Bug tree-optimization/36033] New: Non-optimal vectorization of interleaved data of different types
@ 2008-04-24 9:38 irar at il dot ibm dot com
2008-05-05 6:17 ` [Bug tree-optimization/36033] " pinskia at gcc dot gnu dot org
0 siblings, 1 reply; 2+ messages in thread
From: irar at il dot ibm dot com @ 2008-04-24 9:38 UTC (permalink / raw)
To: gcc-bugs
With the fix of pr35982, interleaved data of different types (of the same size)
can be vectorized only as a collection of single-element strided accesses,
causing redundant misaligned loads.
Better solution for such cases will be to perform all the vector loads and
extraction operations as if the data-refs were of the same type, and then
convert the extracted elements to the correct type if necessary (before
performing any operations on the extracted elements).
The testcase is gcc.dg/vect/fast-math-pr35982.c.
--
Summary: Non-optimal vectorization of interleaved data of
different types
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: irar at il dot ibm dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36033
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/36033] Non-optimal vectorization of interleaved data of different types
2008-04-24 9:38 [Bug tree-optimization/36033] New: Non-optimal vectorization of interleaved data of different types irar at il dot ibm dot com
@ 2008-05-05 6:17 ` pinskia at gcc dot gnu dot org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2008-05-05 6:17 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from pinskia at gcc dot gnu dot org 2008-05-05 06:17 -------
Confirmed.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2008-05-05 06:17:05
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36033
^ permalink raw reply [flat|nested] 2+ messages in thread
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2008-04-24 9:38 [Bug tree-optimization/36033] New: Non-optimal vectorization of interleaved data of different types irar at il dot ibm dot com
2008-05-05 6:17 ` [Bug tree-optimization/36033] " pinskia at gcc dot gnu dot org
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