On 05/14/2016 03:21 AM, Woon yung Liu wrote:
The current constraints allow GCC to access the 64-bit LO+HI register pair as a single 128-bit register, so I am cheating by using both the x and wr (new constraint for LO1+HI1) constraints.
That doesn't seem right.The x constrant is for the hi/lo pair, whatever size it is. You should be able to use that just fine with a 256 bit mode.
r~
