[Bug target/91708] New: [10 regression][ARM] Bootstrap fails in gen_movsi, at config/arm/arm.md:5258

[wilco at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91708

            Bug ID: 91708
           Summary: [10 regression][ARM] Bootstrap fails in gen_movsi, at
                    config/arm/arm.md:5258
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: wilco at gcc dot gnu.org
  Target Milestone: ---

Arm bootstrap still fails with latest trunk when configured with
--with-cpu=cortex-a57:

gcc/gcc/real.c:5240:1: internal compiler error: in gen_movsi, at
config/arm/arm.md:5258

This is another alignment assertion:

(define_expand "movsi"
  [(set (match_operand:SI 0 "general_operand")
        (match_operand:SI 1 "general_operand"))]
  "TARGET_EITHER"
  "
  {
  rtx base, offset, tmp;

  gcc_checking_assert (aligned_operand (operands[0], SImode));
  gcc_checking_assert (aligned_operand (operands[1], SImode));