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improve description of alignment, patch by Alain Frisch.

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llvm-svn: 45662
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Chris Lattner 2008-01-06 21:04:43 +00:00
parent f8d3ea59f3
commit 2b8bb9d2a4
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@ -2843,6 +2843,16 @@ marked as <tt>volatile</tt>, then the optimizer is not allowed to modify
the number or order of execution of this <tt>load</tt> with other the number or order of execution of this <tt>load</tt> with other
volatile <tt>load</tt> and <tt><a href="#i_store">store</a></tt> volatile <tt>load</tt> and <tt><a href="#i_store">store</a></tt>
instructions. </p> instructions. </p>
<p>
The optional "align" argument specifies the alignment of the operation
(that is, the alignment of the memory address). A value of 0 or an
omitted "align" argument means that the operation has the preferential
alignment for the target. It is the responsibility of the code emitter
to ensure that the alignment information is correct. Overestimating
the alignment results in an undefined behavior. Underestimating the
alignment may produce less efficient code. An alignment of 1 is always
safe.
</p>
<h5>Semantics:</h5> <h5>Semantics:</h5>
<p>The location of memory pointed to is loaded.</p> <p>The location of memory pointed to is loaded.</p>
<h5>Examples:</h5> <h5>Examples:</h5>
@ -2870,6 +2880,16 @@ operand. If the <tt>store</tt> is marked as <tt>volatile</tt>, then the
optimizer is not allowed to modify the number or order of execution of optimizer is not allowed to modify the number or order of execution of
this <tt>store</tt> with other volatile <tt>load</tt> and <tt><a this <tt>store</tt> with other volatile <tt>load</tt> and <tt><a
href="#i_store">store</a></tt> instructions.</p> href="#i_store">store</a></tt> instructions.</p>
<p>
The optional "align" argument specifies the alignment of the operation
(that is, the alignment of the memory address). A value of 0 or an
omitted "align" argument means that the operation has the preferential
alignment for the target. It is the responsibility of the code emitter
to ensure that the alignment information is correct. Overestimating
the alignment results in an undefined behavior. Underestimating the
alignment may produce less efficient code. An alignment of 1 is always
safe.
</p>
<h5>Semantics:</h5> <h5>Semantics:</h5>
<p>The contents of memory are updated to contain '<tt>&lt;value&gt;</tt>' <p>The contents of memory are updated to contain '<tt>&lt;value&gt;</tt>'
at the location specified by the '<tt>&lt;pointer&gt;</tt>' operand.</p> at the location specified by the '<tt>&lt;pointer&gt;</tt>' operand.</p>