On systems which support it, the server compiler uses the SSE
instructions. The operation of these instructions depends on
the setting of the %mxcsr register. Currently the VM assumes
that the %mxcsr register is set correctly at VM startup and does
not change. However the Intel SVR4 ABI does mandate a particular
setting for this register and implies that it is volatile across
function calls. The VM needs to be changed to properly initialize the
%mxcsr register and restore the setting at any point where it may have
changed.

This problem exists on 32-bit Intel platforms as well as Linux on
AMD64. On AMD64 Windows, this register is required to be maintained
at the correct value.