[all-commits] [llvm/llvm-project] dd3eb3: [flang] Substrings with lower bound greater than u...

[Pete Steinfeld via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: dd3eb3f33239b23a12dd8864ae236390adf79550
      https://github.com/llvm/llvm-project/commit/dd3eb3f33239b23a12dd8864ae236390adf79550
  Author: Peter Steinfeld <psteinfeld at nvidia.com>
  Date:   2020-09-16 (Wed, 16 Sep 2020)

  Changed paths:
    M flang/lib/Evaluate/variable.cpp
    M flang/test/Semantics/resolve49.f90

  Log Message:
  -----------
  [flang] Substrings with lower bound greater than upper bound

According to section 9.4.1, paragraph 3,
 If the starting point is greater than the ending point, the substring has
 length zero

But the compilers code for substring processing was failing a call to `CHECK()`
in this case.  I fixed this by just setting the number of items in the
resulting string to 0 for this situation.

Differential Revision: https://reviews.llvm.org/D87799