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![lauriewired Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::1610352539089899520.png) LaurieWired [@lauriewired](/creator/twitter/lauriewired) on x 83.7K followers
Created: 2025-07-22 20:38:11 UTC

The number may be well below the human hearing threshold, but the CPU calculates it anyway! 
 
Without extra code to avoid subnormals, this can cause erratic performance issues.
 
With x86’s SSE extension, the DAZ (Denormals-are-zero) instruction lets you round down these small numbers without invoking the subnormal routine.
 
As long as the compiler is hinted correctly (and using the right optimization level), well behaved software should implement DAZ properly.
 
(ARM’s NEON extension implements flush to zero by default; otherwise controlled by the FZ bit for SIMD)
 
There’s a lot more to this story, the contention on the floating point standard is a fascinating rabbit hole. If you’d like to learn more, check out this interview:


![](https://pbs.twimg.com/media/GwfTjQybcAAOK7X.jpg)

XXXXXX engagements

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**Related Topics**
[sse](/topic/sse)

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