[cfe-dev] Enabling "cl_khr_fp64" in order to visit OpenCL code with doubles

[Jorge Fernández Fabeiro]

It works perfectly!

I'm a bit newbie in OpenCL and I didn't know that it was possible to enable
this extension directly in the source code, it's really very simple, ;)

Thank you so much!

2012/3/13 Benyei, Guy <guy.benyei at intel.com>

>  Hi Jorge,****
>
> As it defined by the OpenCL spec, one should use:****
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> #pragma OPENCL EXTENSION cl_khr_fp64 : enable****
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> in order to enable this OpenCL extension. This pragma works fine in Clang.
> ****
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> Thanks****
>
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> [image: email_signature_guy_new2]****
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> *From:* cfe-dev-bounces at cs.uiuc.edu [mailto:cfe-dev-bounces at cs.uiuc.edu] *On
> Behalf Of *Jorge Fern?ndez Fabeiro
> *Sent:* Tuesday, March 13, 2012 14:32
> *To:* Lista de Correo Clang Developers
> *Subject:* Re: [cfe-dev] Enabling "cl_khr_fp64" in order to visit OpenCL
> code with doubles****
>
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> Sorry, I forgot to tell you the Clang and LLVM revisions I'm using:****
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> Clang: r130668 ****
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> LLVM: r130661****
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> I'm using them because they were the latest ones when I started with my
> project in July 2011.****
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> Thanks so much again!****
>
> El 13 de marzo de 2012 13:28, Jorge Fernández Fabeiro <
> fabeirojorge at gmail.com> escribió:****
>
> Hi!****
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> I'm working in a project about source-to-source code transformations and
> I've just programmed a tool using Clang libraries (it's a program I've
> written in C++, it doesn't use Clang command-line tools at all) that visits
> the code of some given "for" loops and apply some optimization
> transformations (now, only loop unrolling). ****
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> Till today I've been testing the tool with OpenCL kernels that operate
> with integers or floats, but now I'm trying to process a kernel that
> operates with doubles, and, unfortunately the tool crashed. First, I tried
> to dump the CompoundStmt that represents the body of a visited "for" loop,
> and I discovered that it's empty when the visited code contains any
> reference to double variables. After this shocking problem, I replaced the
> "double" variables with "float" ones and all went smooth. Considering that
> workaround, I also tried to emit the LLVM representation of my OpenCL
> kernel with doubles, and clang gave me this error: "error: use of type
> 'double' requires cl_khr_fp64 extension to be enabled".****
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> So, is there any method or flag in the classes of the libraries in order
> to enable this extension?****
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> Thanks so much in advance,****
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> Jorge.****
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