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primo
2015 Nov 10
2
Generating Big Num addition code which uses ADC (add with carry) instructions
I'm trying to work out LLVM code which generates something similar to the
following when adding large multiword numbers stored as separate words:
ADD x1 x1
ADC x2 y2
ADC x3 y3
etc, where such a three argument add like ADC on x86 (which includes a
carry in the addition) is available as a machine op.
The background to this is that I'm trying to implement fast multiword
addition in