On 3/2/06, H. J. Lu <[EMAIL PROTECTED]> wrote: > 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.
Which routines are you referring to? I can only find sysdeps/x86_64/fpu_control.h which only touches x387 unit. I think it would make sense to add gcc builtins for status/control word changes, though. Richard.
