Hello!

Attached patch extends TARGET_READ_MODIFY{,_WRITE} peepholes to handle
all integer modes, while also taking care not to introduce additional
QImode register stalls.

While looking at the insn enable condition, I noticed that we don't
use "probe_stack" pattern any more, as the stack check loop is now
implemented in a different way.

2016-04-28  Uros Bizjak  <ubizjak@gmail.com>

    * config/i386/i386.md (peephole2s for operations with memory inputs):
    Use SWI mode iterator.
    (peephole2s for operations with memory outputs): Ditto.
    Do not check for stack checking probe.

    (probe_stack): Remove expander.

Patch was bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

Committed to mainline SVN.

Uros.