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Groups > comp.lang.c++ > #32829
| From | Tim Prince <tprince@computer.org> |
|---|---|
| Newsgroups | comp.lang.c++, comp.lang.c |
| Subject | Re: Why compiler is able to vectorize on int but not on unsigned |
| Date | 2014-12-03 09:23 -0500 |
| Message-ID | <ce8kmcFo0j3U1@mid.individual.net> (permalink) |
| References | <20141203111909.5ec8c7fc@maxa-pc> <m5n1l8$m45$1@dont-email.me> <m5n4rq$k42$1@speranza.aioe.org> |
Cross-posted to 2 groups.
On 12/3/2014 8:57 AM, jacob navia wrote:
> Le 03/12/2014 14:02, James Kuyper a écrit :
>> On 12/03/2014 05:19 AM, Melzzzzz wrote:
>> ...
>>> int testNormal(const vector_t & ghs, const vector_t & lhs) {
>> ...
>>> where: typedef vector<int> vector_t;
>>
>> Cross-posting to comp.lang.c a question about code that can't even be
>> compiled as C code is pointless.
>>
>
> He wrote (and you did not quote that)
>
>> (could be also plain array so I post this to clc as well)
>
> Read for comprehension next time.
but OP leaves it open to guesswork on what extent he simplifies the
problem for C.
OP also leaves his choice of compiler and target open for guesswork.
However, unsigned indexing is notoriously (perhaps even surprisingly)
difficult to deal with in vectorization, particularly on ia32 target.
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Why compiler is able to vectorize on int but not on unsigned Melzzzzz <mel@zzzzz.com> - 2014-12-03 11:19 +0100
Re: Why compiler is able to vectorize on int but not on unsigned James Kuyper <jameskuyper@verizon.net> - 2014-12-03 08:02 -0500
Re: Why compiler is able to vectorize on int but not on unsigned jacob navia <jacob@spamsink.net> - 2014-12-03 14:57 +0100
Re: Why compiler is able to vectorize on int but not on unsigned Tim Prince <tprince@computer.org> - 2014-12-03 09:23 -0500
Re: Why compiler is able to vectorize on int but not on unsigned James Kuyper <jameskuyper@verizon.net> - 2014-12-03 10:03 -0500
Re: Why compiler is able to vectorize on int but not on unsigned Victor Bazarov <v.bazarov@comcast.invalid> - 2014-12-03 09:24 -0500
Re: Why compiler is able to vectorize on int but not on unsigned Richard Heathfield <invalid@see.sig.invalid> - 2014-12-03 14:36 +0000
Re: Why compiler is able to vectorize on int but not on unsigned Melzzzzz <mel@zzzzz.com> - 2014-12-03 16:03 +0100
Re: Why compiler is able to vectorize on int but not on unsigned Victor Bazarov <v.bazarov@comcast.invalid> - 2014-12-03 10:27 -0500
Re: Why compiler is able to vectorize on int but not on unsigned Melzzzzz <mel@zzzzz.com> - 2014-12-03 16:43 +0100
Re: Why compiler is able to vectorize on int but not on unsigned red floyd <no.spam@its.invalid> - 2014-12-03 08:59 -0800
Re: Why compiler is able to vectorize on int but not on unsigned Alain Ketterlin <alain@dpt-info.u-strasbg.fr> - 2014-12-03 18:53 +0100
Re: Why compiler is able to vectorize on int but not on unsigned James Kuyper <jameskuyper@verizon.net> - 2014-12-03 13:13 -0500
Re: Why compiler is able to vectorize on int but not on unsigned Alain Ketterlin <alain@dpt-info.u-strasbg.fr> - 2014-12-04 22:04 +0100
Re: Why compiler is able to vectorize on int but not on unsigned Melzzzzz <mel@zzzzz.com> - 2014-12-05 10:07 +0100
Re: Why compiler is able to vectorize on int but not on unsigned Alain Ketterlin <alain@dpt-info.u-strasbg.fr> - 2014-12-05 10:42 +0100
Re: Why compiler is able to vectorize on int but not on unsigned Melzzzzz <mel@zzzzz.com> - 2014-12-05 11:29 +0100
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