E38 vs E40 PCM
TECH Fanatic
Joined: Aug 2005
Posts: 1,691
Likes: 1
From: Sunny London, UK
Means code for the PCM is based on a totally different CPU instruction set. Like English and Russian. Means the tuning software programmers have their work cut out for them to write custom OS's for these 2 different PCM's.
I imagine that the calibrations for tables between the two were very similar though. Just the code that reads the tables will be quite different. Not sure on performance differences. Someone in the know might be able to inform us of that.
I imagine that the calibrations for tables between the two were very similar though. Just the code that reads the tables will be quite different. Not sure on performance differences. Someone in the know might be able to inform us of that.
FormerVendor
Joined: Jan 2003
Posts: 525
Likes: 0
From: Melbourne, Australia
from a CPU perspecitve the PPC supports floating point, whereas the CPU32 doesn't.
Floating point values have started to creep into some areas of the calibration, but i expect over time more and more will be floating point. It's so much simpler without any need for internal scaling factors for binary precision. Really depends how committed GM are to cpu's with native floating point capabilities, and in this day and age not a whole lot of reasons why they wouldn't.
one thing's for sure - assembly for PPC is not as easy to read as CPU32 and also depending on the compiler chosen and compiler adherence to various "standards and traditions" in the computing world, PPC can be a real bitch in assembly. Anyway we have to worry about that not you guys
Chris...
Floating point values have started to creep into some areas of the calibration, but i expect over time more and more will be floating point. It's so much simpler without any need for internal scaling factors for binary precision. Really depends how committed GM are to cpu's with native floating point capabilities, and in this day and age not a whole lot of reasons why they wouldn't.
one thing's for sure - assembly for PPC is not as easy to read as CPU32 and also depending on the compiler chosen and compiler adherence to various "standards and traditions" in the computing world, PPC can be a real bitch in assembly. Anyway we have to worry about that not you guys
Chris...
