[all-commits] [llvm/llvm-project] 31505c: [flang] Fix spurious overflow warning folding expo...

[Peter Klausler via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 31505c4f6b977c2ccc785de29a047a31563e5c90
      https://github.com/llvm/llvm-project/commit/31505c4f6b977c2ccc785de29a047a31563e5c90
  Author: Peter Klausler <35819229+klausler at users.noreply.github.com>
  Date:   2024-04-22 (Mon, 22 Apr 2024)

  Changed paths:
    M flang/lib/Evaluate/int-power.h

  Log Message:
  -----------
  [flang] Fix spurious overflow warning folding exponentiation by integ… (#88188)

…er powers

The code that folds exponentiation by an integer power can report a
spurious overflow warning because it calculates one last unnecessary
square of the base value. 10.**(+/-32) exposes the problem -- the value
of 10.**64 is calculated but not needed. Rearrange the implementation to
only calculate squares that are necessary.

Fixes https://github.com/llvm/llvm-project/issues/88151.



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