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njuffa has asked 32 questions and find answers to 171 problems.

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njuffa questions

Fast BCD addition
Efficient and accurate computation of the reciprocal of hypot(a,b)
Efficient AVX2 implementation of a 17x17-bit squaring operation with result truncation
Fast implementation of complementary error function with 5-digit accuracy
Optimized 53->32 bit modulo computation on 32-bit processors
Accurate floating-point computation of the sum and difference of two products
Robustly and accurately computing natural logarithm of quotient of two floating-point numbers
Accurate vectorizable implementation of acosf()
Accurate computation of scaled complementary error function, erfcx()
Most accurate way to compute asinhf() from log1pf()?

njuffa answers

Collapse __mask64 aka 64-bit integer value, counting nibbles that have all bits set?
tan(x) approximation to double precision on |x| < pi/4
Efficient and accurate computation of the reciprocal of hypot(a,b)
Best non-trigonometric floating point approximation of tanh(x) in 10 instructions or less
What does the following x86 assembly code with the FLDCW instruction do?
Fast lookup of a null nibble in a 64 bit unsigned
Efficiently represent 16777217 as a float
Accurate sqrt(1 + (x/2)^2) + x/2
Standard deviation using CUDA
How to divide a 128-bit dividend by a 64-bit divisor, where the dividend's bits are all 1's, and where I only need the 64 LSBs of the quotient?