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Date: Thu, 31 May 2012 00:25:00 -0000
From: Chris Metcalf <cmetcalf@tilera.com>
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To: "Joseph S. Myers" <joseph@codesourcery.com>
CC: <rth@twiddle.net>, <libc-ports@sourceware.org>
Subject: Re: fma ulps
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On 5/30/2012 7:51 PM, Joseph S. Myers wrote:
> On Wed, 30 May 2012, rth@sourceware.org wrote:
>
>> +# fma
>> +Test "fma (-0x1.19cab66d73e17p-959, 0x1.c7108a8c5ff51p-107, -0x0.80b0ad65d9b64p-1022) == -0x0.80b0ad65d9d59p-1022":
>> +double: 1
>> +idouble: 1
>> +Test "fma (0x1.0000002p+0, 0x1.ffffffcp-1, -0x1p-300) == 0x1.fffffffffffffp-1":
>> +double: 1
>> +idouble: 1
>> +Test "fma (0x1.153d650bb9f06p-907, 0x1.2d01230d48407p-125, -0x0.b278d5acfc3cp-1022) == -0x0.b22757123bbe9p-1022":
>> +double: 1
>> +idouble: 1
>> +Test "fma (0x1.4000004p-967, 0x1p-106, 0x0.000001p-1022) == 0x0.0000010000003p-1022":
>> +double: 1
>> +idouble: 1
> fma isn't meant to have ulps.

Just to confirm, I did record some 1-ulp results for tile, but only because
the rounding-mode support doesn't exist.  Presumably in that case it's
still better to list ulps than to let the test fail?

-- 
Chris Metcalf, Tilera Corp.
http://www.tilera.com