Displaying 2 results from an estimated 2 matches for "isunpck".
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isnick
2010 Sep 22
1
[LLVMdev] LLVM 2.8 and MMX
...4-bit UNPCKLBW to no longer be selected for certain cases.
> 112805 is benign.
> 112806 causes 64-bit UNPCKHBW to no longer be selected for certain cases.
>
> I've attached a potential fix for the 2.8 branch.
>
> The real problem is that the code above it which checks for
> isUNPCK[L|H]_v_undef_Mask cases is only for when OptForSize is true. It
> assumes that otherwise things can get lowered to PSHUFD (which is true for
> v4i32 and v4f32 but nothing else - in particular MMX operations).
>
> I'll file a bug now...
>
> Nicolas
>
>
> -----Original...
2010 Sep 22
1
[LLVMdev] LLVM 2.8 and MMX
On Sep 21, 2010, at 5:30 PMPDT, Bill Wendling wrote:
> LLVM isn't going to stop generating MMX instructions all together. We can't do that. :-) If the user specifically wants MMX (by, say, using the builtins), we have to support that still. The plan to cease generating MMX for generic vectors is a work-in-progress right now. It's not in 2.8.
>
> -bw
Right, early on there