From: "浩倫 魏" <goberwei@yahoo.com.tw>
To: Richard Henderson <rth@twiddle.net>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] What's the difference between "ld/st" and "qemu_ld/st" in TCG IR?
Date: Sun, 24 May 2015 00:10:58 +0000 (UTC) [thread overview]
Message-ID: <1311292936.348274.1432426258425.JavaMail.yahoo@mail.yahoo.com> (raw)
In-Reply-To: <5560FD66.4040400@twiddle.net>
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Dear Richard:
Now I get it, thanks for the help! :-)
Richard Henderson <rth@twiddle.net> 於 2015/5/24 (週日) 6:21 AM 寫道﹕
On 05/23/2015 05:26 AM, 浩倫 魏 wrote:
> So there are some points that I hope you can help me out:
> 1. Is every guest load/store instruction would be translated to qemu_ld/st IR?
Yes.
> 2. What about another TCG IR "ld/st"? What kind of guest instructions would
> cause TCG generates that IRs and for what purpose?
For instance, vector instructions are often implemented without TCG
temporaries, but instead using ld/st to load the data from the ENV pointer
directly. You can see that in the ARM and i386 targets.
Otherwise, there are sometimes less-used system values that do not warrent a
TCG temporary. You can see that in the alpha target.
r~
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prev parent reply other threads:[~2015-05-24 0:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-23 12:26 [Qemu-devel] What's the difference between "ld/st" and "qemu_ld/st" in TCG IR? 浩倫 魏
2015-05-23 22:21 ` Richard Henderson
2015-05-24 0:10 ` 浩倫 魏 [this message]
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