Required for gcc-4.4.3-r2 to go stable. The test suite is long and intensive. It takes me about six hours on a Core2, so you might want to set aside a day for it.
Testing on x86: I went through the testsuite once. All tests passed, all useflags good. Looks good to go stable to me.
x86 stable, thanks Thomas
ppc stable
Stable on amd64
Stable for HPPA.
arm stable
alpha/ia64/s390/sh/sparc stable
ppc64 stable