1
Analysis Opportunities:
3
//===---------------------------------------------------------------------===//
5
In test/Transforms/LoopStrengthReduce/quadradic-exit-value.ll, the
6
ScalarEvolution expression for %r is this:
10
Outside the loop, this could be evaluated simply as (%n * %n), however
11
ScalarEvolution currently evaluates it as
13
(-2 + (2 * (trunc i65 (((zext i64 (-2 + %n) to i65) * (zext i64 (-1 + %n) to i65)) /u 2) to i64)) + (3 * %n))
15
In addition to being much more complicated, it involves i65 arithmetic,
16
which is very inefficient when expanded into code.
18
//===---------------------------------------------------------------------===//