Re: while loop code generation

tim@franck.Princeton.EDU.composers (Tim Hollebeek)
29 Dec 1997 21:03:50 -0500

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From: tim@franck.Princeton.EDU.composers (Tim Hollebeek)
Newsgroups: comp.compilers
Date: 29 Dec 1997 21:03:50 -0500
Organization: Chemistry Department, Princeton University
References: 97-12-112 97-12-117
Keywords: optimize, code

Andrew Tucker (ast@halcyon.com) wrote:
> On page 227 of Fraser and Hanson's _A Retargetable C Compiler_,
> they claim that the code
> goto L+1
> L: statement
> L+1: if expression != 0 goto L
> L+2:


This technique is also often important when generating code for
virtual machines, since with the 'obvious' opcodes, it saves an
instruction. Since execution time is often dominated by the overhead
of the virtual machine, minimizing the number of instructions executed
for common constructs can be important.


Tim Hollebeek
email: tim@wfn-shop.princeton.edu
URL: http://wfn-shop.princeton.edu/~tim
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