Chris Jackson 5ba8020326 [DebugInfo][LSR] Emit shorter expressions from scev-based salvaging ...

The scev-based salvaging for LSR can sometimes produce unnecessarily
verbose expressions. This patch adds logic to detect when the value to
be recovered and the induction variable differ by only a constant
offset. Then, the expression to derive the current iteration count can
be omitted from the dbg.value in favour of the offset.

Reviewed by: aprantl

Differential Revision: https://reviews.llvm.org/D109044

2021-09-19 21:41:44 +01:00

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