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From: | Richard Henderson |
Subject: | Re: [Qemu-ppc] [Qemu-devel] [PATCH 28/32] ppc: Avoid double translation for lvx/lvxl/stvx/stvxl |
Date: | Fri, 29 Jul 2016 18:00:16 +0530 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1 |
On 07/29/2016 12:26 PM, Benjamin Herrenschmidt wrote:
So I can't do something like set TCG_CALL_NO_RWG (nor TCG_CALL_NO_WG) on something like dcbz because it can take an exception, correct ?
You can't set NO_RWG, but you can say NO_WG. It "reads" the registers via the exception (and it certainly has side effects). But it doesn't write to the registers (along the normal return path; a loophole I've used elsewhere).
r~
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