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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
end of thread, other threads:[~2008-05-20 6:42 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 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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