21 Jul
2016
21 Jul
'16
11:23 p.m.
An occasionally forgotten feature is that ALU
operations also have a S-bit to
indicate whether they should update the flags based on the result, or leave
them alone.
Power ISA also has this feature (the so-called "dot" instructions). It also
has special forms of instructions for setting the overflow and carry flags,
when appropriate.
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Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com
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