http://d.puremagic.com/issues/show_bug.cgi?id=9039

           Summary: __vector() support in template type resolution
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: turkeyman@gmail.com


--- Comment #0 from Manu <turkeyman@gmail.com> 2012-11-17 07:37:06 PST ---
It would be really convenient if I could do this:

template someTemplate(T : __vector(U[N]), U, size_t N)
{
  // code...
}

Where T is a simd ('__vector()') type, and I could infer U and N this way. This would allow me to build a bunch of simd related templates in a sane way, and conveniently add simd awareness to existing templates in std.traits.

Currently they tend to look like this (testing 'is' every possible type that
matches):

    template isSIMD(T)
    {
        static if(is(T == double2) || is(T == float4) ||
                  is(T == long2) || is(T == ulong2) ||
                  is(T == int4) || is(T == uint4) ||
                  is(T == short8) || is(T == ushort8) ||
                  is(T == byte16) || is(T == ubyte16) || is(T == void16))
            enum bool isVector = true;
        else
            enum bool isVector = false;
    }


You'll even notice there is a bug in this code; 256bit vector types were added
more recently, and this code wasn't updated...
It would all work properly (and future-proof) if I could do it this way:

    template isSIMD(T : __vector(U[N]), U, size_t N)
    {
        enum bool isSIMD = true;
    }
    template isSIMD(T)
    {
        enum bool isSIMD = false;
    }

And obvious extrapolations:
elementType!(), numElements!(), etc.
I could then also add support for SIMD types to the std.traits templates such
as Signed!, Unsigned!, etc, rather trivially, and also simplify a lot of other
code in the std.simd WIP.

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla@digitalmars.com


--- Comment #1 from Walter Bright <bugzilla@digitalmars.com> 2012-11-17 13:16:08 PST ---
This already works (it's in the test suite):

void BaseTypeOfVector(T : __vector(T[N]), size_t N)(int i)
{
    assert(is(T == int));
    assert(N == 4);
}


void test7411()
{
    BaseTypeOfVector!(__vector(int[4]))(3);
}

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--- Comment #2 from Manu <turkeyman@gmail.com> 2012-11-17 15:19:13 PST ---
Huzzah! :)
It didn't work when I first tried it some time back. I should have tried it
again!

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WORKSFORME


--- Comment #3 from Walter Bright <bugzilla@digitalmars.com> 2012-11-19 16:39:41 PST ---
Guess we can close this, then!

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--- Comment #4 from Manu <turkeyman@gmail.com> 2012-11-19 17:00:23 PST ---
(In reply to comment #3)
> Guess we can close this, then!

Yeah go for it.
Sorry for opening a redundant ticket >_<

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