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Re: [PATCH,RFC]: Change entry block and exit block to non-negativenumbers


I suspect the reason ENTRY and EXIT are negative was probably laziness
to avoid going through the code and finding which of the places that
loop from index 0 to n_basic_blocks would break if ENTRY and EXIT were
included. As well as many historical places which probably assumed block
0 was the entry block.


Yup. It took a *lot* of auditing to find all these places.
:)
for (i = NUM_FIXED_BLOCKS; i < n_basic_blocks; i++)

(I have to think about the latter for a few extra milliseconds... and we
all know how much I hate to think :-)

I'll add a new macro there.

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