[Issue 7181] Make bswap a recognized sequence, rather than an intrinsic

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7181


Andrei Alexandrescu <andrei at metalanguage.com> changed:

           What    |Removed                     |Added
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                 CC|                            |andrei at metalanguage.com


--- Comment #3 from Andrei Alexandrescu <andrei at metalanguage.com> 2011-12-29 12:23:38 PST ---
Wonder if other patterns would need to be figured as well, e.g. 

    auto p1 = cast(char*) &x;
    int y = void;
    auto p2 = cast(char*) &y;
    p2[0] = p1[3];
    p2[1] = p1[2];
    p2[2] = p1[1];
    p2[3] = p1[0];

Or (probably more realistically) patterns involving temporaries and 2
expressions:

    auto y = ( x << 24 ) | ( x << 8 ) & 0xff0000;
    y |= ( x >> 8 ) & 0xff00 | ( x >> 24 );

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