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Re: [Qemu-devel] [PATCH 4/7] tcg: Optimize double-word comparisons again


From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH 4/7] tcg: Optimize double-word comparisons against zero
Date: Mon, 01 Oct 2012 11:47:15 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120911 Thunderbird/15.0.1

On 2012-10-01 11:43, Aurelien Jarno wrote:
> While it's a nice optimization to have, one that seems to happen a lot
> more often is the two high parts being equal. It happens when the guest
> is working on (u)int32_t.

It depends on what target you're looking at.  For alpha guest, all branches
are comparisons vs zero, so LT/GE happens with some regularity.



r~



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