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Re: [Qemu-devel] [PATCH v3 13/34] tcg: Add atomic helpers

From: Leon Alrae
Subject: Re: [Qemu-devel] [PATCH v3 13/34] tcg: Add atomic helpers
Date: Mon, 12 Sep 2016 08:59:33 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

On Fri, Sep 09, 2016 at 09:26:29AM -0700, Richard Henderson wrote:
> On 09/09/2016 07:46 AM, Leon Alrae wrote:
> >Wouldn't it be useful if tcg.h provided also aliases for _le/_be atomic
> >helpers (equivalent to helper_ret_X_mmu) so that in target-* code we wouldn't
> >need to care about the endianness (specifically I'm thinking about SC in MIPS
> >where I need to select between helper_atomic_cmpxchgl_le_mmu() and
> >helper_atomic_cmpxchgl_be_mmu()).
> Perhaps.  I would have hoped that you could do the SC inline now
> though, and tcg_gen_atomic_cmpxchg() will do the selection for you.

On every SC we need to do the virtual -> physical address translation as we
have to compare the physical address against that of the preceeding LL.
This operation seems too complex to be inlined :(


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