Hello, I'm having trouble trying to find the best compiling option for amcc440 with fpu. I'm using a genuine fedora core 6 ppc distro (gcc4.1.1). It seems that using mcpu=440 gives better results than -mcpu=440fp, even with floating point code ? What could be wrong on my platform to give such a result ? The test : mandelbrot.c is available here: http://magnux.free.fr/gcc/mandelbrot.c -------------------- -bash-3.00# gcc -O2 -mcpu=440fp ./mandelbrot.c -o ./mandelbrot && time ./mandelbrot real 1m15.016s user 1m14.988s sys 0m0.024s -bash-3.00# gcc -O2 -mcpu=440 ./mandelbrot.c -o ./mandelbrot && time ./mandelbrot real 0m39.606s user 0m39.552s sys 0m0.028s -bash-3.00# gcc -O2 -msoft-float ./mandelbrot.c -o ./mandelbrot && time ./mandelbrot real 0m39.577s user 0m39.544s sys 0m0.032s -bash-3.00# gcc -O2 ./mandelbrot.c -o ./mandelbrot && time ./mandelbrot real 1m15.059s user 1m14.996s sys 0m0.060s ___________________________________________________________________________ Découvrez une nouvelle façon d'obtenir des réponses à toutes vos questions ! Profitez des connaissances, des opinions et des expériences des internautes sur Yahoo! Questions/Réponses http://fr.answers.yahoo.com
