From: Tom Musta <tommusta@gmail.com>
To: Richard Henderson <rth@twiddle.net>, qemu-devel@nongnu.org
Cc: qemu-ppc@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 12/14] VSX Stage 4: Add Scalar SP Fused Multiply-Adds
Date: Thu, 14 Nov 2013 14:58:38 -0600 [thread overview]
Message-ID: <5285397E.5040607@gmail.com> (raw)
In-Reply-To: <528407BE.6000707@twiddle.net>
On 11/13/2013 5:14 PM, Richard Henderson wrote:
> On 11/14/2013 06:49 AM, Tom Musta wrote:
>> I have also done quite a bit of random and targeted random testing using Power
>> hardware to produce expected results. The targeted random tests followed your
>> suggestion above: generate AxB + C where abs(exp(A) - exp(B)) = 23 and
>> abs(exp(A) - exp(C)) = 46. Several million test patterns have been generated
>> and played back through QEMU without any miscompares in the numerical results.
>
> Here's an example that produces wrong results when rounding to double first.
> Replace the portable math.h calls with ppc asm as necessary.
>
> <snip>
> r~
>
Thanks, Richard. You have convinced me.
next prev parent reply other threads:[~2013-11-14 20:59 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-06 20:31 [Qemu-devel] [PATCH 00/14] VSX Stage 4 Tom Musta
2013-11-06 20:31 ` [Qemu-devel] [PATCH 01/14] VSX Stage 4: Add VSX 2.07 Flag Tom Musta
2013-11-06 20:31 ` [Qemu-devel] [PATCH 02/14] VSX Stage 4: Refactor lxsdx Tom Musta
2013-11-06 20:31 ` [Qemu-devel] [PATCH 03/14] VSX Stage 4: Add lxsiwax, lxsiwzx and lxsspx Tom Musta
2013-11-06 20:31 ` [Qemu-devel] [PATCH 04/14] VSX Stage 4: Refactor stxsdx Tom Musta
2013-11-06 20:31 ` [Qemu-devel] [PATCH 05/14] VSX Stage 4: Add stxsiwx and stxsspx Tom Musta
2013-11-06 20:31 ` [Qemu-devel] [PATCH 06/14] VSX Stage 4: Add xsaddsp and xssubsp Tom Musta
2013-11-06 20:31 ` [Qemu-devel] [PATCH 07/14] VSX Stage 4: Add xsmulsp Tom Musta
2013-11-06 20:31 ` [Qemu-devel] [PATCH 08/14] VSX Stage 4: Add xsdivsp Tom Musta
2013-11-06 20:31 ` [Qemu-devel] [PATCH 09/14] VSX Stage 4: Add xsresp Tom Musta
2013-11-06 20:31 ` [Qemu-devel] [PATCH 10/14] VSX Stage 4: Add xssqrtsp Tom Musta
2013-11-06 20:31 ` [Qemu-devel] [PATCH 11/14] VSX Stage 4: add xsrsqrtesp Tom Musta
2013-11-06 20:31 ` [Qemu-devel] [PATCH 12/14] VSX Stage 4: Add Scalar SP Fused Multiply-Adds Tom Musta
2013-11-07 23:28 ` Richard Henderson
2013-11-07 23:30 ` Richard Henderson
2013-11-08 0:13 ` Richard Henderson
2013-11-13 20:49 ` Tom Musta
2013-11-13 23:14 ` Richard Henderson
2013-11-14 20:58 ` Tom Musta [this message]
2013-11-06 20:31 ` [Qemu-devel] [PATCH 13/14] VSX Stage 4: Add xscvsxdsp and xscvuxdsp Tom Musta
2013-11-06 20:31 ` [Qemu-devel] [PATCH 14/14] VSX Stage 4: Add xxleqv, xxlnand and xxlorc Tom Musta
2013-11-08 0:23 ` [Qemu-devel] [PATCH 00/14] VSX Stage 4 Richard Henderson
2013-11-08 14:53 ` Tom Musta
2013-11-13 14:35 ` Tom Musta
2013-11-08 15:55 ` Andreas Färber
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