[PATCH 5/6] Generate more shrink-wrapping opportunities

[Jeff Law]

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On 03/23/11 08:55, Bernd Schmidt wrote:
> The first basic block contains insns to move incoming argument registers
> to pseudos. When these pseudos live across calls, they get allocated to
> call-saved registers. This in turns disables shrink-wrapping, since the
> move instruction requires the prologue (saving the call-saved reg) to
> occur before it.
> 
> This patch addresses the problem by moving such moves downwards through
> the CFG until we find a place where the destination is used or the
> incoming argument is clobbered.
OK.  At some point I'll probably want to move this code to run
immediately after IRA completes and extend it in a few ways, but for now
it's OK as it stands.

jeff
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