See http://gcc.gnu.org/ml/gcc/2005-08/msg00284.html. IMHO it's currently only
working for Linux. Given the author has claimed a big performance boost with
this patch, I guess it should be ported mingw32 since it's also an i386 host.
--
Summary: FTZ/DAZ for SSE should be ported to mingw32
Product: gcc
Version: 4.1.1
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: zuxy dot meng at gmail dot com
GCC build triplet: mingw32
GCC host triplet: mingw32
GCC target triplet: mingw32
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29498