FP                108 nanojit/NativeARM.h FP  = 11,
FP                121 nanojit/NativePPC.h FP  = R31,
FP                126 nanojit/NativeSparc.h FP  = I6,
FP                101 nanojit/NativeX64.h FP = RBP,
FP                127 nanojit/Nativei386.h FP = EBP, // alias FP to EBP for convenience