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* [Bug target/36224] New: vec_widen_smult_{hi,lo}_v4si generates pmuludq instruction
@ 2008-05-12 20:00 gnu at the-meissners dot org
2008-05-12 20:01 ` [Bug target/36224] " gnu at the-meissners dot org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: gnu at the-meissners dot org @ 2008-05-12 20:00 UTC (permalink / raw)
To: gcc-bugs
The vec_widen_smult_{hi,lo}_v4si functions are incorrect, in that they generate
the pmuludq instruction, which does a 32x32->64 unsigned multiply. For
example, multiplying -13 * 15 = gives 64424509245 with the current code, when
it should give -195.
The sse5 instructions pmacsdqh and pmacsdql could do this instruction, but not
anything in the standard sse2 set.
--
Summary: vec_widen_smult_{hi,lo}_v4si generates pmuludq
instruction
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: gnu at the-meissners dot org
GCC build triplet: x86_64-unknown-linux-gnu
GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36224
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/36224] vec_widen_smult_{hi,lo}_v4si generates pmuludq instruction
2008-05-12 20:00 [Bug target/36224] New: vec_widen_smult_{hi,lo}_v4si generates pmuludq instruction gnu at the-meissners dot org
@ 2008-05-12 20:01 ` gnu at the-meissners dot org
2008-05-20 6:40 ` ubizjak at gmail dot com
2008-05-20 6:42 ` ubizjak at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: gnu at the-meissners dot org @ 2008-05-12 20:01 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from gnu at the-meissners dot org 2008-05-12 20:00 -------
Created an attachment (id=15631)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15631&action=view)
Test case for bug 36224
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36224
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/36224] vec_widen_smult_{hi,lo}_v4si generates pmuludq instruction
2008-05-12 20:00 [Bug target/36224] New: vec_widen_smult_{hi,lo}_v4si generates pmuludq instruction gnu at the-meissners dot org
2008-05-12 20:01 ` [Bug target/36224] " gnu at the-meissners dot org
@ 2008-05-20 6:40 ` ubizjak at gmail dot com
2008-05-20 6:42 ` ubizjak at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: ubizjak at gmail dot com @ 2008-05-20 6:40 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from ubizjak at gmail dot com 2008-05-20 06:40 -------
Fixed by:
Author: meissner
Date: Wed May 14 18:02:56 2008
New Revision: 135302
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=135302
Log:
Fix pr36224
Added:
trunk/gcc/testsuite/gcc.dg/pr36224.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/sse.md
trunk/gcc/testsuite/ChangeLog
and
Author: meissner
Date: Mon May 19 20:03:48 2008
New Revision: 135580
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=135580
Log:
Backport fix for 36224
Added:
branches/gcc-4_3-branch/gcc/testsuite/gcc.dg/pr36224.c
Modified:
branches/gcc-4_3-branch/gcc/ChangeLog
branches/gcc-4_3-branch/gcc/config/i386/sse.md
branches/gcc-4_3-branch/gcc/testsuite/ChangeLog
BTW: Please copy ChangeLog entry (without author line) into the commit text in
order to automatically update Bugzilla PR.
--
ubizjak at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2008-05-20 06:40:14
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36224
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/36224] vec_widen_smult_{hi,lo}_v4si generates pmuludq instruction
2008-05-12 20:00 [Bug target/36224] New: vec_widen_smult_{hi,lo}_v4si generates pmuludq instruction gnu at the-meissners dot org
2008-05-12 20:01 ` [Bug target/36224] " gnu at the-meissners dot org
2008-05-20 6:40 ` ubizjak at gmail dot com
@ 2008-05-20 6:42 ` ubizjak at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: ubizjak at gmail dot com @ 2008-05-20 6:42 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from ubizjak at gmail dot com 2008-05-20 06:41 -------
Fixed.
--
ubizjak at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
URL| |http://gcc.gnu.org/ml/gcc-
| |patches/2008-
| |05/msg00842.html
Status|NEW |RESOLVED
Resolution| |FIXED
Target Milestone|--- |4.3.1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36224
^ permalink raw reply [flat|nested] 4+ messages in thread
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2008-05-12 20:00 [Bug target/36224] New: vec_widen_smult_{hi,lo}_v4si generates pmuludq instruction gnu at the-meissners dot org
2008-05-12 20:01 ` [Bug target/36224] " gnu at the-meissners dot org
2008-05-20 6:40 ` ubizjak at gmail dot com
2008-05-20 6:42 ` ubizjak at gmail dot com
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