[Info-vax] LLVM, volatile and async VMS I/O and system calls

[chris]

On 09/22/21 20:58, Bob Gezelter wrote:
> On Wednesday, September 22, 2021 at 2:11:40 PM UTC-4, Simon Clubley wrote:
orld.
>>
>> There's a reason why volatile is used so liberally in embedded bare-metal
>> programming. :-)
>>
>> Simon.

Primarily because embedded spends a lot of time accessing hardware
registers directly, for example:

volatile unsigned char *ttyport = (volatile unsigned char*) TTY_PORT

which assigns a numerc value to the pointer and tells the compiler
not to optimise it away, nor change the value.

Something application level code should rarely, if ever, see...

Chris