improve the global variable alignment description.
it is not generally valid for targets to overalign
them when an alignment is specified.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102474 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/LangRef.html b/docs/LangRef.html
index 414c7a0..05637ab 100644
--- a/docs/LangRef.html
+++ b/docs/LangRef.html
@@ -851,11 +851,14 @@
<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>