Subject: pointer size in [CC99]
From: Mayur Naik (mhn@hotbot.com)
Date: Thu Apr 20 2000 - 19:37:58 PDT
Hello
>> The experimental assessment in [CC99] considers the space cost of a pointer to be 1 byte. Wouldn't 4 bytes be more realistic?
>
>Why do you say it's only a byte? I intended it to be 4. Actual SPARC data.
>
The last para of sec. 5.2 in [CC99] says:
In the dynamically typed versions, all expressions corresponding to predicate class boolean tests have only 2 possible classes, while all formal expressions have all 861 classes.
However, the minimum and maximum size (in bytes) for the pure [] implementation in the dynamically typed version in Table 3 is specified as 8 and 867 respectively. The former is the sum of 2 bytes for pointers to the 2 possible classes plus 6 bytes for the array lookup instruction, and the latter is the sum of 861 bytes for pointers to the 861 possible classes plus 6 bytes for the array lookup instruction.
I inferred that you assume a pointer to be of 1 byte from these results. Please correct me if I'm wrong.
Thanks for your time.
-- Mayur
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