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Update per Bill's comments. Work in progress.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90271 91177308-0d34-0410-b5e6-96231b3b80d8
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Eric Christopher 2009-12-01 22:28:41 +00:00
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@ -7263,22 +7263,22 @@ LLVM</a>.</p>
<h5>Overview:</h5>
<p>The <tt>llvm.objectsize</tt> intrinsic returns the constant number of bytes
from <tt>ptr</tt> to the end of the object <tt>ptr</tt> points to if it
from <tt>ptr</tt> to the end of the object <tt>ptr</tt> points to, if it
can deduce this at compile time. If there are any side-effects in evaluating
the argument or it cannot deduce which objects <tt>ptr</tt> points to at compile
time the intrinsic returns <tt>(size_t) -1</tt> for <tt>type</tt> 0
or 1 and <tt>(size_t) 0</tt> for <tt>type</tt> 2 or 3.</p>
time, the intrinsic returns <tt>i32/i64 -1</tt> for <tt>type</tt> 0
or 1 and <tt>i32/i64 0</tt> for <tt>type</tt> 2 or 3.</p>
<h5>Arguments:</h5>
<p>The <tt>llvm.objectsize</tt> intrinsic takes two arguments. The first
argument is a pointer to the object <tt>ptr</tt> and an integer <tt>type</tt>.
<tt>type</tt> is an integer ranging from 0 to 3. The lsb corresponds to
a return value based on whole objects, the second bit whether or not we
return the maximum or minimum remaining bytes computed.</p>
argument is a pointer to the object <tt>ptr</tt>. The second argument
is an integer <tt>type</tt> which ranges from 0 to 3. The first bit
corresponds to a return value based on whole objects, and the second bit
whether or not we return the maximum or minimum remaining bytes computed.</p>
<h5>Semantics:</h5>
<p>The <tt>llvm.objectsize</tt> intrinsic is lowered to either a constant
representing the size of the object concerned or <tt>(size_t) -1</tt> if
representing the size of the object concerned or <tt>i32/i64 -1</tt> if
it cannot be determined at compile time.</p>
</div>