Ping #1: [Patch,AVR]: Fix PR29560 (map 16-bit shift to 8-bit)

[Georg-Johann Lay]

This patch is still pending review:

http://gcc.gnu.org/ml/gcc-patches/2011-07/msg02376.html

Georg-Johann Lay a écrit:

[...]

So here is a cleaned up version that maps to QI shifts.

Tested without regressions.

Ok?

Johann

        PR target/29560
        * config/avr/avr.md (any_extend): New code interator.
        (extend_prefix): New code attribute.
        (*ashl<extend_prefix>qihiqi3): New insn-and-splits.
        (*ashl<extend_prefix>qihiqi3.mem): New insn-and-splits.
        (*ashlhiqi3): New insn-and-split.
        Add peephole2 to map ashlhi3 to ashlqi3 if high part of
        shift target is unused.