将非规范化的数字冲洗为零 [英] Flushing denormalised numbers to zero

问题描述

我一直在网上搜索无济于事.

I've scoured the web to no avail.

Xcode和Visual C ++是否可以将非规范化数字视为0?我本以为IDE偏好设置中有一个选项可以打开该选项，但似乎找不到它.

Is there a way for Xcode and Visual C++ to treat denormalised numbers as 0? I would have thought there's an option in the IDE preferences to turn on this option but can't seem to find it.

我正在做一些跨平台的音频工作，需要停止某些处理器占用资源.

I'm doing some cross-platform audio stuff and need to stop certain processors hogging resources.

欢呼

推荐答案

您正在寻找一种平台定义的方法来设置MXCSR寄存器中的FTZ和/或DAZ(在具有SSE或x86-64的x86上)；参见 https://stackoverflow.com/a/2487733/567292

You're looking for a platform-defined way to set FTZ and/or DAZ in the MXCSR register (on x86 with SSE or x86-64); see https://stackoverflow.com/a/2487733/567292

通常，这称为_controlfp之类的东西； Microsoft文档位于 http://msdn.microsoft.com/en-us/library/e9b52ceh.aspx

Usually this is called something like _controlfp; Microsoft documentation is at http://msdn.microsoft.com/en-us/library/e9b52ceh.aspx

您还可以使用_MM_SET_FLUSH_ZERO_MODE宏:

You can also use the _MM_SET_FLUSH_ZERO_MODE macro: http://msdn.microsoft.com/en-us/library/a8b5ts9s(v=vs.71).aspx - this is probably the most cross-platform portable method.

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