[Bug target/64405] New: [arm] Invalid codegenaration for ARMv3 and ARMv2

[Bug target/64405] New: [arm] Invalid codegenaration for ARMv3 and ARMv2

[Sergey.Belyashov at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64405

            Bug ID: 64405
           Summary: [arm] Invalid codegenaration for ARMv3 and ARMv2
           Product: gcc
           Version: 4.8.5
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: Sergey.Belyashov at gmail dot com

I try to compile program for ARMv3 or ARMv2 CPU target using GCC (4.8.x). It
produces assembler code with BX LR instructions (return from function) which
GAS (2.23.2) cannot compile:
   Error: selected processor does not support ARM mode `bx lr'
It is work for ARMv4 mode and greater (ARMv4 has no BX <reg> instruction
support, but GAS compiles it as MOV PC,<reg>).

As I know BX <reg> is strongly recommended to be used instead of MOV PC,<reg>
by the ARM architecture manual (section A.4.1.1) but GAS developers says, that
it is GCC bug.

GAS mail archive:
https://lists.gnu.org/archive/html/bug-binutils/2014-10/msg00017.html

[Bug target/64405] [arm] Invalid codegenaration for ARMv3 and ARMv2

[Sergey.Belyashov at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64405

Sergey Belyashov <Sergey.Belyashov at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |ARMv4
      Known to fail|                            |4.8.4

--- Comment #1 from Sergey Belyashov <Sergey.Belyashov at gmail dot com> ---
answer about GAS:
https://lists.gnu.org/archive/html/bug-binutils/2014-12/msg00145.html

[Bug target/64405] [arm] Invalid codegenaration for ARMv3 and ARMv2

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64405

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |9.0
         Resolution|---                         |WONTFIX
             Status|NEW                         |RESOLVED

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
ARMv3/ARMv2 support was removed in GCC 9+ (r9-404). So closing as won't fix.