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Re: [Qemu-devel] [PATCH 15/17] ppc: store CR registers in 32 1-bit regis
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH 15/17] ppc: store CR registers in 32 1-bit registers |
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Date: |
Tue, 09 Sep 2014 18:26:48 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0 |
Il 09/09/2014 18:03, Richard Henderson ha scritto:
> Note that since most hosts don't have nand, the combination
>
> nand x,y,z
> and x.x,1
>
> would be better represented with
>
> and x,y,z
> xor x,x,1
True (and even for crorc a,b,c you can change it to crandc a,c,b
followed by xor). But this is quite a borderline case. You'll find in
practice only "creqv a,a,a", which the optimizer can handle fine.
Paolo