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linearScanEnd pragma; string case statement optimization

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Araq 2011-03-14 23:57:41 +01:00
commit 8d734244b1
26 changed files with 537 additions and 252 deletions
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24
doc/nimrodc.txt
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@ -293,10 +293,26 @@ However it is not efficient to do:
.. code-block:: Nimrod
var s = varA # assignment has to copy the whole string into a new buffer!
..
String case statements are optimized too. A hashing scheme is used for them
if several different string constants are used. This is likely to be more
efficient than any hand-coded scheme.
The compiler optimizes string case statements: A hashing scheme is used for them
if several different string constants are used. So code like this is reasonably
efficient:
.. code-block:: Nimrod
case normalize(k.key)
of "name": c.name = v
of "displayname": c.displayName = v
of "version": c.version = v
of "os": c.oses = split(v, {';'})
of "cpu": c.cpus = split(v, {';'})
of "authors": c.authors = split(v, {';'})
of "description": c.description = v
of "app":
case normalize(v)
of "console": c.app = appConsole
of "gui": c.app = appGUI
else: quit(errorStr(p, "expected: console or gui"))
of "license": c.license = UnixToNativePath(k.value)
else: quit(errorStr(p, "unknown variable: " & k.key))
..