Superoptimizing an FPU Emulator(purplesyringa.moe)
39 points by dverlaeckt80 | 6 comments
Blog post on using superoptimization to find an optimal instruction sequence for a floating-point emulator function returning a float's lowest set bit.
#bit-manipulation on Hacker News
3 stories tagged bit-manipulation, newest first.
Vectorized CLZ and CTZ(purplesyringa.moe)
47 points by zX41ZdbW | 5 comments
Blog post on purplesyringa explaining how to implement vectorized count-leading-zeros and count-trailing-zeros using floating-point tricks.
A leap year check in three instructions(hueffner.de)
386 points by gnabgib | 130 comments
Blog post by Falk Hüffner explaining a leap year check for years 0–102499 using a multiply, mask, and compare in about three CPU instructions.