Daniel Berlin
On Tuesday, February 19, 2002, at 11:01 AM, Kevin Jacobs wrote:
On Tue, 19 Feb 2002, Daniel Berlin wrote:
On Tuesday, February 19, 2002, at 09:51 AM, Neil Schemenauer wrote:
Daniel Berlin wrote:
When you get to optimizations, you want Advanced Compiler Design and Implementation by Muchnick.
Right now I'm not planning to do any optimizations (except perhaps limiting the number of registers used).
This is, of course, a tricky optimization to do. Limiting registers used involves splitting live ranges at the right places, etc.
Why limit the number of registers at all? So long as they fit in L1 cache you are golden.
Err, what makes you think this? The largest problem on architectures like x86 is the number of registers. You end up with about 4 usable registers. (hardware register renaming only helps eliminate instruction dependencies, before someone mentions it). Performance quickly drops when you start spilling registers to the stack.
I think you misunderstand what Rattlesnake is; AIUI it is (or will/intends to be) a register based VM for Python replacing the current stack based VM -- I think gcc still gets to decide which x86 registers to use... Cheers, M. -- ARTHUR: The ravenours bugblatter beast of Traal ... is it safe? FORD: Oh yes, it's perfectly safe ... it's just us who are in trouble. -- The Hitch-Hikers Guide to the Galaxy, Episode 6
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Michael Hudson