zyl910

优化技巧、硬件体系、图像处理、图形学、游戏编程、国际化与文本信息处理。

  博客园 :: 首页 :: 博问 :: 闪存 :: 新随笔 :: 联系 :: 订阅 订阅 :: 管理 ::
  215 随笔 :: 0 文章 :: 145 评论 :: 111万 阅读
< 2025年2月 >
26 27 28 29 30 31 1
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 1
2 3 4 5 6 7 8

今天在百度上看到一则消息——

http://tieba.baidu.com/p/1362181987
IVY Bridge : There's more than 22nm
I named this title...this is a information that were said to be confirmed on Intel forums

"
• Two instructions to support 16-bit floating-point data type conversion to and from single-precision floating-point type. Conversion to packed 16-bit floating-point values from packed single-precision floating-point values also provides rounding control using an immediate byte. These float-16 instructions convert packed data types of different sizes following the same manner as the 256-bit vector SIMD extension, AVX.
• One instruction that generates random numbers of 16/32/64 bit wide random
integers. The random number generator instruction operates on general-purpose registers.
• Four instructions that allow software working in 64-bit environment to read and write FS base and GS base registers in all privileged levels.
"

From the point of view of marketing, this see***ike what they've done on Westmere, which they improved the register and buffer system , making it efficient for virtual machine.

Well, tecnically, this seems to be more important. B3Der once were discussing about how much will 16-bit floating-point vertex processing on Haswell speed up the graphics performance. Seems now it has advanced to IVY Bridge.

尝试翻译了一下——

1. 2条指令用于支持16位浮点和(32位)单精度浮点的转换。(后面没看明白,似乎还支持打包16位,同时还能用在AVX指令集中)
2. 1条指令用于生成 随机的 16/32/64位整数。该指令能用于通用寄存器。
3. 4条指令允许软件能在64位环境的任何访问级下读写FS、GS寄存器。

对于消息真伪,我先利用Google搜索了一番——

http://208.65.201.106/showthread.php?p=32834403
Yesterday, 12:01 PM    #118 
CPUarchitect
Member
Join Date: Jun 2011
Posts: 48  

--------------------------------------------------------------------------------

Quote: Oh really? IVY starts to support 16bit floating point?

Yes, according to the AVX software programming interface, and confirmed in the Intel forums, Ivy Bridge adds:

• Two instructions to support 16-bit floating-point data type conversion to and from single-precision floating-point type. Conversion to packed 16-bit floating-point values from packed single-precision floating-point values also provides rounding control using an immediate byte. These float-16 instructions convert packed data types of different sizes following the same manner as the 256-bit vector SIMD extension, AVX.
• One instruction that generates random numbers of 16/32/64 bit wide random
integers. The random number generator instruction operates on general-purpose registers.
• Four instructions that allow software working in 64-bit environment to read and write FS base and GS base registers in all privileged levels.

Only in case a bug is detected they might pull out support for these instructions, which is not likely to happen.


Quote: Also I'd like to ask..Isn't the AVX Shuffle in Sandy Bridge is a parallel memory operation, which is a part of "AVX 1.0"? 

No, none of the AVX1 shuffle instructions allow access to non-sequential memory locations. 

内容大同小异,有一定的可信度。

但我还是不放心,又去查intel文档,最终找到了——

posted on   zyl910  阅读(839)  评论(0编辑  收藏  举报
编辑推荐:
· [.NET]调用本地 Deepseek 模型
· 一个费力不讨好的项目,让我损失了近一半的绩效!
· .NET Core 托管堆内存泄露/CPU异常的常见思路
· PostgreSQL 和 SQL Server 在统计信息维护中的关键差异
· C++代码改造为UTF-8编码问题的总结
阅读排行:
· 一个费力不讨好的项目,让我损失了近一半的绩效!
· 清华大学推出第四讲使用 DeepSeek + DeepResearch 让科研像聊天一样简单!
· 实操Deepseek接入个人知识库
· CSnakes vs Python.NET:高效嵌入与灵活互通的跨语言方案对比
· Plotly.NET 一个为 .NET 打造的强大开源交互式图表库
点击右上角即可分享
微信分享提示