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Re: [PATCH, rtl-optimization]: Fix PR 51821, 64bit > 32bit conversion produces incorrect results with optimizations

On 01/13/2012 10:58 AM, Richard Sandiford wrote: 
>  Yes, because new test ALWAYS includes the registers that were wrongly
>  marked as dead by previous test due to REG_UNUSED and noclobber
>  processing.

Or to put it another way: the insn-to-insn changes in the current liveness
sets are all produced by df_simulate_one_insn_{backwards,forwards}, which
uses the same information.  So I don't think there's any reason why we
need to keep the current code as well.

Yes, both explanations are sound. I think the patch is good, too.

Paolo

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