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| constant expressions gah@ugcs.caltech.edu (glen herrmannsfeldt) (2009-01-13) |
| Re: constant expressions DrDiettrich1@aol.com (Hans-Peter Diettrich) (2009-01-15) |
| Re: constant expressions gneuner2@comcast.net (George Neuner) (2009-01-16) |
| From: | Hans-Peter Diettrich <DrDiettrich1@aol.com> |
| Newsgroups: | comp.compilers |
| Date: | Thu, 15 Jan 2009 02:32:06 +0100 |
| Organization: | Compilers Central |
| References: | 09-01-031 |
| Keywords: | code, optimize |
| Posted-Date: | 15 Jan 2009 05:37:06 EST |
glen herrmannsfeldt schrieb:
> I know compilers have done compile time evaluation of scalar constant
> expressions for many years. I wonder about the state of the art in
> compile time evaluation of constant array expressions. I would
> include the case of arrays in initialized variables that are known at
> compile time not to change.
It's a matter of the operations, that are allowed in constant
expressions. When array member selection is considered such a
"constant operation", then a compiler has to implement indexing into
constant arrays as part of the evaluation of constant expressions.
> Do any compilers now do compile time
> evaluation of complicated array expressions?
The "constant expression evaluator" can be seen as part of a
compiler, interpreting any expression and returning both a flag,
whether the expression really was a constant expression, and, if true,
also returning the according constant value.
DoDi
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