Re: [PATCH 5/6] combine: handle REG_UNUSED in reg_dead_at_p (PR59278)

[Jeff Law]

On 11/27/14 18:44, Segher Boessenkool wrote:
Currently reg_dead_at_p returns 0 for registers that are set but never
used.  This patch repairs that oversight.  This fixes PR59278.

2014-11-27  Segher Boessenkool  <seg...@kernel.crashing.org>

gcc/
        PR rtl-optimization/59278
        combine (reg_dead_at_p): Consider REG_UNUSED notes.
OK with a testcase.  ISTM you can just create an SH specific testcase 
from the code in the BZ.  Pre-approved with suitable testcase.

jeff