From: Richard Henderson <rth@twiddle.net>
To: "Chen Gang" <xili_gchen_5257@hotmail.com>,
"Peter Maydell" <peter.maydell@linaro.org>,
"Chris Metcalf" <cmetcalf@ezchip.com>,
"Andreas Färber" <afaerber@suse.de>,
"Riku Voipio" <riku.voipio@iki.fi>,
"walt@tilera.com" <walt@tilera.com>
Cc: qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [Consult] tilegx: Is it a qemu's system bug?
Date: Sat, 25 Apr 2015 09:30:06 -1000 [thread overview]
Message-ID: <553BEB3E.4020909@twiddle.net> (raw)
In-Reply-To: <BLU436-SMTP1994B1CAA3FBA3AD3A2CEB1B9EB0@phx.gbl>
On 04/25/2015 05:12 AM, Chen Gang wrote:
> Hello All:
>
> I want to consult an issue I met below for the latest master branch, is
> it a qemu's bug? (it is about ctz/cnttz instruction for tilegx)
>
> OP:
> ld_i32 tmp0,env,$0xfffffffffffffffc
> movi_i32 tmp1,$0x0
> brcond_i32 tmp0,tmp1,ne,$L0
> movi_i64 tmp3,$0x0 /* Initialize tmp3 */
> set_label $L1
> shr_i64 tmp2,r2,tmp3
You can't keep temporaries live across basic blocks.
That is, across set_label, br, or brcond. In that case
you'd have to use tcg_new_local_temp() instead.
That said, you shouldn't open-code ctz but instead use
a helper function and use ctz64().
r~
next prev parent reply other threads:[~2015-04-25 19:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-25 15:12 [Qemu-devel] [Consult] tilegx: Is it a qemu's system bug? Chen Gang
2015-04-25 19:30 ` Richard Henderson [this message]
2015-04-25 23:30 ` Chen Gang
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