Re: [boost] cstdint.hpp patch for Cray X1

From: Matthias Troyer (troyer_at_[hidden])
Date: 2003-01-23 12:43:01

Hi Dan,

I don't think this will be needed since on the X1 USHRT_MAX should be 
0xffff, and thus the default version will work. Note that the patch for 
the SV1 and other Crays that I submitted checks for USHRT_MAX being 
0xffffffff and thus does not apply on the X1 anyways.

On another note, I got jam to compile on the SV1, and have submitted a 
patch. Now I am running the regression tests on it. Not having access 
to an X1 yet (and the 4.2 compilers don't exist for other Crays), I 
can't run the tests there at the moment. Could you try to run it, once 
I have patched boost for the SV1?

Best regards,

Matthias

On Thursday, January 23, 2003, at 05:49 PM, Dan Gohman wrote:

> The recent change to boost/cstdint.hpp for Cray systems is not
> appropriate for the Cray X1. It has a 16-bit short type, however there
> are performance penalties associated with it.
>
> The following patch for cstdint.hpp sets up the appropriate typedefs 
> for
> this platform.
>
> diff -u -r1.29 cstdint.hpp
> --- boost/cstdint.hpp   22 Jan 2003 12:12:14 -0000      1.29
> +++ boost/cstdint.hpp   23 Jan 2003 16:32:04 -0000
> @@ -160,7 +160,16 @@
>
>  //  16-bit types
> -----------------------------------------------------------//
>
> -# if USHRT_MAX == 0xffff
> +# if defined(__crayx1)
> +     // The Cray X1 has a 16-bit short, however it is not recommend
> +     // for use in performance critical code.
> +     typedef short           int16_t;
> +     typedef short           int_least16_t;
> +     typedef int             int_fast16_t;
> +     typedef unsigned short  uint16_t;
> +     typedef unsigned short  uint_least16_t;
> +     typedef unsigned int    uint_fast16_t;
> +# elif USHRT_MAX == 0xffff
>       typedef short           int16_t;
>       typedef short           int_least16_t;
>       typedef short           int_fast16_t;
>
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