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936a110
2015 Jan 15
2
[LLVMdev] confusion w.r.t. scalar evolution and nuw
> We are permitted to turn 'sub nsw i32 %x, 1' into 'add nsw i32 %x, -1'
nsw also has the same problem:
sub nsw int_min, int_min is 0 but
add nsw int_min, (-int_min) is poison
-- Sanjoy