[llvm-commits] patch: THUMB2 support for PUSH a single reg

[liangh at codeaurora.org]

Hi,

Currently, LLVM doesn't generate PUSH instructions for THUMB2 when a
single register is pushed.
For example, it issues "str r7, [sp, #-4]!" but not "push {r7}".

This patch adds THUMB2 support for PUSH instruction with a single
register. So that a real PUSH instruction will be generated for this case.
I.e.: str r7, [sp, #-4]! => push {r7}

Could you please review the attached patch?
Thanks.

-Liang
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