[PATCH RFC 4/4] R600: optimize the UDIVREM 64 algorithm

[Matt Arsenault]

On 04/25/2014 12:08 PM, Jan Vesely wrote:
> +        HBit = DAG.getNode(AMDGPUISD::BFE_U32, DL, HalfVT, LHS_Lo, POS, one);
This might want a check for a subtarget with BFE instructions. 
Alternatively, I've been thinking it might be easier for places that 
want to use BFE to just use it, and to handle expanding BFE nodes for 
the old GPUs that don't support it somewhere else.