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Re: [Qemu-devel] [PATCH 15/19] Add VSX xmax/xmin Instructions
From: |
Richard Henderson |
Subject: |
Re: [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~
- [Qemu-devel] [PATCH 11/19] Add VSX ISA2.06 xtdiv Instructions, (continued)
- [Qemu-devel] [PATCH 11/19] Add VSX ISA2.06 xtdiv Instructions, Tom Musta, 2013/10/24
- [Qemu-devel] [PATCH 12/19] Add VSX ISA2.06 xtsqrt Instructions, Tom Musta, 2013/10/24
- [Qemu-devel] [PATCH 13/19] Add VSX ISA2.06 Multiply Add Instructions, Tom Musta, 2013/10/24
- [Qemu-devel] [PATCH 14/19] Add VSX xscmp*dp Instructions, Tom Musta, 2013/10/24
- [Qemu-devel] [PATCH 15/19] Add VSX xmax/xmin Instructions, Tom Musta, 2013/10/24
- Re: [Qemu-devel] [PATCH 15/19] Add VSX xmax/xmin Instructions,
Richard Henderson <=
- Re: [Qemu-devel] [PATCH 15/19] Add VSX xmax/xmin Instructions, Peter Maydell, 2013/10/24
[Qemu-devel] [PATCH 16/19] Add VSX Vector Compare Instructions, Tom Musta, 2013/10/24
[Qemu-devel] [PATCH 17/19] Add VSX Floating Point to Floating Point Conversion Instructions, Tom Musta, 2013/10/24
[Qemu-devel] [PATCH 18/19] Add VSX ISA2.06 Integer Conversion Instructions, Tom Musta, 2013/10/24