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Word

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3	3	= GHC Commentary: The Word =
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5		The most important type in the runtime is {{{StgWord}}}, defined in [[GhcFile(includes/StgTypes.h)]]
6		[[HelloWorld(foo,bar)]]
	5	The most important type in the runtime is {{{StgWord}}}, defined in [[GhcFile(includes/StgTypes.h)]]. A word is defined to be the same size as a pointer on the current platform. All these types are interconvertible without losing information, and have the same size (as reported by {{{sizeof}}}):
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	7	{{{StgWord}}}::
	8	An unsiged integral type of word size
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	10	{{{StgInt}}}::
	11	A signed integral type of word size
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	13	{{{StgPtr}}}::
	14	Pointer to {{{StgWord}}}
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	16	The word is the basic unit of allocation in GHC: the heap and stack are both allocated in units of a word. Throughout the runtime we often use sizes that are in units of words, so as to abstract away from the real word size of the underlying architecture.
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	18	C-- only understands units of bytes, so we have various macros in [[GhcFile(includes/Cmm.h)]] to make manipulating things in units of words easier in {{{.cmm}}} files.