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improve the global variable alignment description. 

it is not generally valid for targets to overalign
them when an alignment is specified.

llvm-svn: 102474
This commit is contained in:
Chris Lattner 2010-04-28 00:13:42 +00:00
parent d06fb865eb
commit 78e00bcb76
1 changed files with 8 additions and 5 deletions
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13
llvm/docs/LangRef.html
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@ -851,11 +851,14 @@ define i32 @main() { <i>; i32()* </i>
<p>LLVM allows an explicit section to be specified for globals. If the target
supports it, it will emit globals to the section specified.</p>
<p>An explicit alignment may be specified for a global. If not present, or if
the alignment is set to zero, the alignment of the global is set by the
target to whatever it feels convenient. If an explicit alignment is
specified, the global is forced to have at least that much alignment. All
alignments must be a power of 2.</p>
<p>An explicit alignment may be specified for a global, which must be a power
of 2. If not present, or if the alignment is set to zero, the alignment of
the global is set by the target to whatever it feels convenient. If an
explicit alignment is specified, the global is forced to have exactly that
alignment. Targets are not allowed to over-align the global in cases where
it is observable: for example, overaligning a global is observable if it has
an assigned section and higher alignment could cause holes between
consequtive globals.</p>
<p>For example, the following defines a global in a numbered address space with
an initializer, section, and alignment:</p>