[llvm] [APInt] Add APIntOps::absdiff to compute the absolute difference of 2 unsigned values (PR #82255)

[Nikita Popov via llvm-commits]

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@@ -2187,6 +2187,11 @@ inline const APInt &umax(const APInt &A, const APInt &B) {
   return A.ugt(B) ? A : B;
 }
 
+/// Determine the absolute difference of two APInts considered to be unsigned.
+inline const APInt absdiff(const APInt &A, const APInt &B) {
+  return umax(A, B) - umin(A, B);
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nikic wrote:

I think it would be better to implement this in terms of `A >= B ? A - B : B - A`.

https://github.com/llvm/llvm-project/pull/82255