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Re: [PATCH][RFA][LRA] Don't try to break down subreg expressions if insn already matches


On 02/14/15 04:23, Maxim Kuvyrkov wrote:

FYI, (and not related to the core issue of this patch)

The use of mult vs shift by combine is a problem that Venkat is
working on, see "[RFC] Tighten memory type assumption in RTL combiner
pass" .  The combiner uses MULTs instead of SHIFTs for rtx'es that
look like addresses, even when they are, in fact, mere
logic/arithmetic operations.
Right. I think I put that into my gcc-6 queue because we don't have a regression that requires this problem be fixed.

If you've got a BZ that's regressing because of this issue, don't hesitate to point it out and I'll move the thread into my gcc-5 queue.

jeff


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