Patch: Make _mm_prefetch accept const pointers

[Silvius Rus]

Patch Description
=================

This patch fixes a regression from 4.2.1.

Without this change, the following code compiles at -O2 with 4.2.1, but 
not with current trunk:

const void* a = ...;
_mm_prefetch (a, ...);

The proposed change adds "const" to the first parameter of _mm_prefetch.

-_mm_prefetch (void *__P, enum _mm_hint __I)
+_mm_prefetch (const void *__P, enum _mm_hint __I)

The proposed change would make the signature closer to the corresponding 
one in the Intel C++ compiler for Linux, which is "void 
_mm_prefetch(char const*a, int sel)".  See 
http://www.intel.com/software/products/compilers/clin/docs/ug_cpp/comm1030.htm.


Tested
======

Bootstrapped on i686.
make -k check showed no regression with vs. without this proposed patch.


gcc/ChangeLog
=============

2008-01-29  Silvius Rus  <rus@google.com>

       * config/i386/xmmintrin.h (_mm_prefetch): Add const to first arg.


Thank you,
Silvius


 
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