On 12/12/2023 17:48, Anthony Walter via fpc-pascal wrote:
Do any of the compiler devs know if Pascal programs for the x86
instruction set are using ENTER and its second argument to the best
possible effect? I am curious.
FPC used it in the past, but stopped using it because
1) on modern processors the expanded sequence is much faster than the
single enter instruction
2) enter is limited to allocating stack frames of 32kb or 64kb (so we
had to support non-enter-based entry code anyway)
3) IIRC the Linux kernel doesn't support the enter instruction (if it
requires a new page to be allocated for the stack, I believe it can
crash the program)
TP did use it.
Jonas
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