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From: "ramana at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/49157] Unnecessary stack save/restore code generated for a leaf function (arm-elf-gcc)
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49157

Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011.06.01 19:56:05
                 CC|                            |ramana at gcc dot gnu.org
     Ever Confirmed|0                           |1

--- Comment #1 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> 2011-06-01 19:56:05 UTC ---
With an arm-linux-gnueabi toolchain I see the following code - it's pointless
creating space on the stack in this case. 

foo:
    @ args = 0, pretend = 0, frame = 8
    @ frame_needed = 0, uses_anonymous_args = 0
    @ link register save eliminated.
    add    r0, r0, r0, lsr #16
    sub    sp, sp, #8
    sxth    r0, r0
    add    sp, sp, #8
    bx    lr


Possibly related to PR36409.

Ramana