[Patches] [ python-Patches-429024 ] Deal with some unary ops at compile time

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Patches item #429024, was opened at 2001-05-31 07:27
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Category: Parser/Compiler
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Fred L. Drake, Jr. (fdrake)
>Assigned to: Jeremy Hylton (jhylton)
Summary: Deal with some unary ops at compile time

Initial Comment:
This patch makes unary + and - operations with numeric
literals compile to a constant reference instead of a
constant reference and UNARY_POSITIVE or UNARY_NEGATIVE
opcode.  This could be extended to support UNARY_INVERT
as well, but that would be a little more complicated.

Folding unary + only affects one case in the regression
test, but folding the - affects 817 places (on a Linux
system with pretty much everything enabled).  I don't
know that this makes much difference at runtime, but
certainly reduces the number of opcodes evaluated.


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Comment By: Tim Peters (tim_one)
Date: 2001-08-09 11:13

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Back to Jeremy.

Fred's patch is fine by me, but I'd like to see a comment 
before the 20 lines of mallocs and frees and strcpys 
explaining what the *intent* of all that stuff is (it's a 
lot of code to stick "-" at the front of a string <wink>).

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Comment By: Fred L. Drake, Jr. (fdrake)
Date: 2001-06-03 21:24

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Re-assigned to Tim since Jeremy's on a new assignment.

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