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Re: [qemu-s390x] [Qemu-devel] [PATCH] include/fpu/softfloat: Fix compila

From: Richard Henderson
Subject: Re: [qemu-s390x] [Qemu-devel] [PATCH] include/fpu/softfloat: Fix compilation with Clang on s390x
Date: Wed, 16 Jan 2019 09:05:45 +1100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

On 1/16/19 2:29 AM, Thomas Huth wrote:
> ... but at least it gives the same results as the DLGR instruction. The 64-bit
> version gives different results - do we have a bug here?

Yes, on your inputs.  udiv_qrnnd3 requires that D be "normalized", i.e. have
the most siginificant bit set.  (And thus N1:N0 shifted left to match, and the
returned remainder shifted right to match.)


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