From: Richard Henderson <rth@twiddle.net>
To: "浩倫 魏" <goberwei@yahoo.com.tw>,
"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: Sat, 23 May 2015 15:21:26 -0700 [thread overview]
Message-ID: <5560FD66.4040400@twiddle.net> (raw)
In-Reply-To: <636961558.306257.1432383983549.JavaMail.yahoo@mail.yahoo.com>
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~
next prev parent reply other threads:[~2015-05-23 22:23 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 [this message]
2015-05-24 0:10 ` 浩倫 魏
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