[Bug target/82248] New: probe_stack can generate unpredictable STR on arm

[schwab@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82248

            Bug ID: 82248
           Summary: probe_stack can generate unpredictable STR on arm
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: schwab@linux-m68k.org
  Target Milestone: ---
            Target: arm*-*-*

The probe_stack insn uses "str r0,%0" with hard-coded reference to r0, but this
is unpredictable if %0 happens to use pre-indexed or post-indexed addressing
mode with r0 as base.