[all-commits] [llvm/llvm-project] ef48e9: LoopVectorize/iv-select-cmp: add test for decreasi...

[Ramkumar Ramachandra via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ef48e90489dc219568f46a9c36da80adfb759ad7
      https://github.com/llvm/llvm-project/commit/ef48e90489dc219568f46a9c36da80adfb759ad7
  Author: Ramkumar Ramachandra <Ramkumar.Ramachandra at imgtec.com>
  Date:   2023-09-25 (Mon, 25 Sep 2023)

  Changed paths:
    M llvm/test/Transforms/LoopVectorize/iv-select-cmp.ll

  Log Message:
  -----------
  LoopVectorize/iv-select-cmp: add test for decreasing IV out-of-bound

The most straightforward extension to D150851 would involve handling the
decreasing IV case, for which tests have been added in 110ec1863a
(LoopVectorize/iv-select-cmp: add test for decreasing IV, const start).
However, the commit missed a testcase for the out-of-bound sentinel
value LONG_MAX, which should not be vectorized. Fix this by adding a
test corresponding to the following program:

  long test(long *a) {
    long rdx = 331;
    for (long i = LONG_MAX; i >= 0; i--) {
      if (a[i] > 3)
        rdx = i;
    }
    return rdx;
  }

Differential Revision: https://reviews.llvm.org/D157969