[Bug rtl-optimization/92176] LRA problem with reloads for subreg operands

[krebbel at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92176

--- Comment #7 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
Created attachment 47432
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47432&action=edit
Updated testcase

This is an updated testcase with the changes I propose.

Your testcase works fine. However, I would propose two minor adjustments:

- add -mzarch to enable the vector instructions also in a testsuite run with
-m31. The testcase does not trigger the problem on -m31 for other reasons but
that way it would at least have to the chance to.

- scan also for the element index in vsteb to be 0. With the proper index there
is a chance that code with vsteb is actually correct.