https://bugzilla.novell.com/show_bug.cgi?id=354238
Summary: Future Optimization: Use Dictionary<string,int> for
switch on string
Product: Mono: Compilers
Version: SVN
Platform: Other
OS/Version: Other
Status: NEW
Severity: Enhancement
Priority: P5 - None
Component: C#
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
QAContact: [email protected]
Found By: ---
Created an attachment (id=190742)
--> (https://bugzilla.novell.com/attachment.cgi?id=190742)
test case
Attached you'll find a simple C# program using a switch() on string.
- gmcs emits code equivalent to a chain of if-else statements
- csc emits the construction and initialization of a static
Dictionary<string,int> object, and the switch opcode which uses the output of
Dictionary<string,int>.TryGetValue.
The CIL generated by gmcs and csc is attached as well.
Issuing 'find -name "*.cs" | grep -v "Test" | xargs grep "case \""' in
mcs/class will give you a rough idea how often a switch() on strings (with many
case-values) is used (and whether it's worthwhile to implement this
optimization).
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