PR37363: PR36090 and PR36182 all over again

[Paolo Bonzini]

Paolo Bonzini wrote:
> Hans-Peter Nilsson wrote:
>>> Date: Fri, 5 Sep 2008 14:57:00 +0200
>>> From: Hans-Peter Nilsson <hp@axis.com>
>>> Maybe as part of a change from target macro to target hook, with
>>> LEGITIMATE_CONSTANT_P as a default would fit, even at this
>>> stage?
>> Sorry, I mean CONSTANT_P, not LEGITIMATE_CONSTANT_P.  Or maybe a
>> new macro or hook
> 
> What about replacing the problematic uses of gen_rtx_CONST with
> "plus_constant (x, 0)"?  plus_constant knows when to make a CONST rtx.
> 
> There are just a handful of places where this would be needed: instead
> of the check after the wrong comment in cse.c, and everywhere
> gen_rtx_CONST is used in simplify-rtx.c.

Here is a prototype patch, untested.

Paolo
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