njuffa

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njuffa has asked 29 questions and find answers to 167 problems.

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njuffa questions

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()?
Efficient faithfully-rounded implementation of error function erff()
Vectorizable implementation of complementary error function erfcf()
Implementation of sinpi() and cospi() using standard C math library

njuffa answers

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?
Fast implementation of complementary error function with 5-digit accuracy
Floating Point numbers on VAX machine
Converting from IEEE-754 to Fixed Point with nearest rounding
How can I do efficiently bitwise majority voting on 3, 5, 7, 9 inputs with SSE/SSE2/AVX/...?