Berkeley CSUA MOTD:Entry 25760
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2024/11/23 [General] UID:1000 Activity:popular
11/23   

2002/9/3-4 [Computer/SW/OS/Windows] UID:25760 Activity:high
9/3     Why can't an NT kernel-mode driver perform floating point calculations?
        Thanks.
        \_ I haven't written NT kernel-mode drivers in a while but my
           recollection is that saving and restoring the floating point state
           is relatively expensive and they didn't want to do this when
           switching among kernel threads.
           \_ If the kernel used floating-point math, you'd also need to
              save and restore all the floating-point registers every time
              a process made a system call.
              \_ Couldn't you just save and restore only when you intend to
                 use FP?
                \_ uhh, you could save the registers in the kernel code and
                   restore them before returning to user space
                   \_ That's what I mean -- the kernel needs to take the
                      time to save and restore the registers every time a
                      system call is made.  It's easy to code, but it makes
                      every system call slower.
2024/11/23 [General] UID:1000 Activity:popular
11/23   

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