Re: Problem with cblas_sgemm in 64 bit build
Re: Problem with cblas_sgemm in 64 bit build
- Subject: Re: Problem with cblas_sgemm in 64 bit build
- From: Rick Hoge <email@hidden>
- Date: Thu, 5 Jun 2008 12:39:35 -0400
As usual I'm sure it will turn out to be some silly small thing (and
not a mysterious alignment issue with CBLAS). The strange thing is
that the problem only arises when the matrices involved exceed a
certain size.
After further testing with simplified test cases, I think it actually
is a bug in the CBLAS function cblas_sgemm that pops up in 64-bit
builds. I filed it (bug id 5988197).
Searching the lists.apple.com archives I did not find very many
mentions of CBLAS or this function - I posted a more detailed
description of my tests, with sample code, in perfoptimization-dev
(which seems to have very low traffic).
As a workaround, I'm using the double-precision version cblas_dgemm,
which works fine (although it's not really what I want).
Rick
Rick
On 4-Jun-08, at 2:08 PM, Kyle Sluder wrote:
Take a look at NSInteger and CGFloat, and the 64-Bit Transition Guide
for Cocoa: http://developer.apple.com/documentation/Cocoa/Conceptual/Cocoa64BitGuide/ConvertingExistingApp/chapter_4_section_3.html
--Kyle Sluder
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