MacBook Pro, 10.6.6, Core 2 Duo
ProtoContext ProtoTransform ProtoLambda Loop
GCC 4.2.1 (Apple) : 5.3565438 5.3721942 126.38458 1.3657978
GCC 4.4.5 : 1.8878364 1.8845548 70.056237 0.942303
GCC 4.5.2 : 1.8840608 1.889619 1.2806688 1.0589558
GCC 4.6.0 (2/5/11): 1.8854768 1.8834438 1.278347 1.2345208
CLANG 2.9 (125472): 5.455976 5.4627628 3.825104 1.2330524
Now, removing the ((noinline)), gives (in the same order)
GCC 4.2.1 (Apple) : 4.1448478 5.3795842 126.53211 1.3215378
GCC 4.4.5 : 1.2505956 1.2500816 69.409665 0.7198288
GCC 4.5.2 : 0.596143 0.7213138 0.71969283 0.7211534
GCC 4.6.0 (2/5/11): 1.2942638 1.4324828 0.646147 0.6632324
CLANG 2.9 (125472): 1.2975226 1.2966478 1.3849834 1.2452362