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Old 04 February 2020, 16:51   #169
Per aspera ad astra

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Join Date: Mar 2017
Location: Crossing the Rubicon
Age: 49
Posts: 2,472
Originally Posted by sparhawk View Post
Maybe there is a faster way to clear the upper word of a register?
If you know for sure that's a positive value, you can
ext.l dx
(4 cycles )

But usually I keep a register with the upper part zeroed out of the main loop and then move the data only for the lower part.
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