With this patch: http://gcc.gnu.org/ml/gcc-patches/2004-11/msg01877.html
gcc no longer mixes SSE and x387 math by default. However glibc still assumes gcc mixes SSE and x387 math. The x86-64 FP control routines in glibc change both SSE and x387 units, which is no longer necessary with the newer gcc. But glibc has no way to know if gcc mixes SSE and x387 math. I am proposing to define __FPMATH_387__ if x387 math is used and define __FPMATH_SSE__ if SSE math is used, respectively. If 2 units are used, both will be defined. Glibc can have sets math unit control routines and only call the ones be using. H.J.
