Matt Pharr 1dedd88132 Improve implementaton of 'are both masks equal' check for AVX. ...

Previously, we did a vector equal compare and then a movmsk, the
result of which we checked to see if it was on for all lanes.
Because masks are vectors of i32s, under AVX, the vector equal
compare required two 4-wide SSE compares and some shuffling.
Now, we do a movmsk of both masks first and then a scalar
equality comparison of those two values, which seems to generate
overall better code.

2011-09-15 06:25:02 -07:00

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