https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66326
--- Comment #1 from Eric <ejolson at unr dot edu> --- The compilers gcc-5.1 and cilkplus-4_8-branch were bootstrapped using the Debian 4.7.2-5 gcc compiler on Debian Wheezy. Compiling and running the test program yields the following output: $ /usr/local/gcc-5.1/bin/gcc -fcilkplus -Wall \ -mfpmath=387 fpbug.c -o fpbug-gcc510-387 -lcilkrts -lm $ ./fpbug-gcc510-387 Floating point exception $ /usr/local/gcc-5.1/bin/gcc -fcilkplus -Wall \ -mfpmath=sse fpbug.c -o fpbug-gcc510-sse -lcilkrts -lm $ ./fpbug-gcc510-sse f(1)+g(2)=0.850648 $ /usr/local/cilk-4.8/bin/gcc -fcilkplus -Wall \ -mfpmath=387 fpbug.c -o fpbug-cilk48-387 -lcilkrts -lm $ ./fpbug-cilk48-387 f(1)+g(2)=0.850648 $ /usr/local/cilk-4.8/bin/gcc -fcilkplus -Wall \ -mfpmath=sse fpbug.c -o fpbug-cilk48-sse -lcilkrts -lm $ ./fpbug-cilk48-sse f(1)+g(2)=0.850648