[all-commits] [llvm/llvm-project] 3ad982: [flang] Fix the extent calculation when upper boun...

[Pete Steinfeld via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3ad9826dcd480d04480ebb98dae426f435a2c135
      https://github.com/llvm/llvm-project/commit/3ad9826dcd480d04480ebb98dae426f435a2c135
  Author: Peter Steinfeld <psteinfeld at nvidia.com>
  Date:   2021-08-10 (Tue, 10 Aug 2021)

  Changed paths:
    M flang/lib/Evaluate/shape.cpp
    A flang/test/Evaluate/folding21.f90

  Log Message:
  -----------
  [flang] Fix the extent calculation when upper bounds are less than lower bounds

When the upper bound is less than the lower bound, the extent is zero.  This is
specified in section 8.5.8.2, paragraph 3.

Note that similar problems exist in the lowering code.  This change only fixes
the problem for the front end.

I also added a test.

Differential Revision: https://reviews.llvm.org/D107832