[llvm-commits] [llvm] r52691 - in /llvm/trunk/lib/Target/X86: X86CallingConv.td X86ISelLowering.cpp X86InstrMMX.td X86RegisterInfo.td

[Dale Johannesen]

On Jun 24, 2008, at 5:59 PMPDT, Eli Friedman wrote:

> "Add v2f32 (MMX) type to X86."
>
> This doesn't make any sense.  x86 doesn't have a v2f32 type: floating
> point operations aren't supported on MMX registers.  Is there anything
> useful that can be done with a legal v2f32 that can't be done by just
> bitcasting it to a v2i32?

For parameter passing purposes this type uses MMX registers, so I  
think it makes sense to represent it this way.
You could probably get it to work the way you suggest.