Surprisingly useful little identity: if a, b, c >= 0, then saturate(a + b - c) = saturate(saturate(a + saturate(b - c)) - saturate(c - b)) where saturate(x) = min(max(x, 0), k) for some real k >= 0
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If you want to pick one of my weird identities to remember, make it this one: if (x&mask)==0, then _pdep_u64(_pext_u64(x, mask) + 1, mask) == ((x - mask) & mask) [I explain this in https://fgiesen.wordpress.com/2011/01/17/texture-tiling-and-swizzling/ …]
Hm? When (x&mask) == 0, then pext(x, mask) will also be 0, and pdep(0+1, mask) will just be the first set bit in mask, no?
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Typo: when (x&~mask)==0.
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Ah. That makes more sense.
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