Am Dienstag, dem 12.09.2023 um 11:25 +0200 schrieb Richard Biener via Gcc: > On Tue, Sep 5, 2023 at 10:44 PM Toon Moene <t...@moene.org> wrote: > > > > This is going to be an interesting discussion. > > > > In the upcoming GNU Tools Cauldron meeting the representation of complex > > numbers in GCC will be discussed from the following "starting point": > > > > "Complex numbers are used to describe many physical phenomenons and are > > of prime importance in data signal processing. Nevertheless, despite > > being part of the C and C++ standards since C99, they are still not > > completely first class citizens in mainstream compilers." > > > > *This* is from the Fortran 66 Standard (http://moene.org/~toon/f66.pdf - > > a photocopy of the 1966 Standard): > > > > - - - - - > > > > Chapter 4. Data Types: > > ... > > 4.2.4 Complex Type. > > > > A complex datum is processor approximation to the value of a complex number. > > ... > > > > - - - - - > > > > I can recall people complaining about the way complex arithmetic was > > handled by compilers since the late 70s. > > > > This is even obvious in weather forecasting software I have to deal with > > *today* (all written in Fortran). Some models use complex variables to > > encode the "spectral" (wave-decomposed) computations in parts where that > > is useful - others just "degrade" those algorithms to explicitly use reals. > > Lack of applications / benchmarks using complex numbers is also a > problem for any work on this. >
I could probably provide some examples such as a FFT, complex Gaussian random number generation, mandelbrot set computation, etc. Martin
