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123456 |
- STACK OVERFLOW PROTECTION: To avoid having to check for stack
- underflow after each pop operation (which can end up being
- prohibitive in terms of costs), PS_ADDR should be set to
- at least 6 bytes before its actual limit. 6 bytes because we
- seldom have words requiring more than 3 items from the stack.
- Then, at each "exit" call we check for stack underflow.
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