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alb
2018 Feb 28
1
How to handle UMULO?
If your target has a cheap count-leading-zeros instruction, you'd be able to determine whether an unsigned multiply will overflow or not, in most cases, without doing the long version of the multiplication. This is because an N-bit number times an M-bit number will produce a result that is either N+M bits wide or N+M-1 bits wide. If an N+M bit result will fit in your result type, you are