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From: | Richard Henderson |
Subject: | Re: [Qemu-ppc] [Qemu-devel] [PATCH 15/19] Add VSX xmax/xmin Instructions |
Date: | Thu, 24 Oct 2013 13:45:03 -0700 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0 |
On 10/24/2013 09:26 AM, Tom Musta wrote: > Because of the Power ISA definitions of maximum and minimum > on various boundary cases, the standard softfloat comparison > routines (e.g. float64_lt) do not work as well as one might > think. Therefore specific routines for comparing 64 and 32 > bit floating point numbers are implemented in the PowerPC > helper code. Really? All I see in the document is ">fp", used both here in the minmax insn and in the cmp insn. If the softfloat compare isn't good enough for minmax, how can it be good enough for cmp? r~
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