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Note the relationship between C99 restrict and LLVM noalias, and

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clarify a few other things.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107659 91177308-0d34-0410-b5e6-96231b3b80d8
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Dan Gohman 2010-07-06 15:26:33 +00:00
parent 36335be3b9
commit ff70fe40aa
2 changed files with 15 additions and 4 deletions
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docs/GetElementPtr.html
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@ -64,7 +64,8 @@
<div class="doc_text"> <div class="doc_text">
<p>This document seeks to dispel the mystery and confusion surrounding LLVM's <p>This document seeks to dispel the mystery and confusion surrounding LLVM's
GetElementPtr (GEP) instruction. Questions about the wily GEP instruction are <a href="LangRef.html#i_getelementptr">GetElementPtr</a> (GEP) instruction.
Questions about the wily GEP instruction are
probably the most frequently occurring questions once a developer gets down to probably the most frequently occurring questions once a developer gets down to
coding with LLVM. Here we lay out the sources of confusion and show that the coding with LLVM. Here we lay out the sources of confusion and show that the
GEP instruction is really quite simple. GEP instruction is really quite simple.
@ -653,7 +654,8 @@ idx3 = (char*) &amp;MyVar + 8
<li>Support C, C-like languages, and languages which can be <li>Support C, C-like languages, and languages which can be
conceptually lowered into C (this covers a lot).</li> conceptually lowered into C (this covers a lot).</li>
<li>Support optimizations such as those that are common in <li>Support optimizations such as those that are common in
C compilers.</li> C compilers. In particular, GEP is a cornerstone of LLVM's
<a href="LangRef.html#pointeraliasing">pointer aliasing model</a>.</li>
<li>Provide a consistent method for computing addresses so that <li>Provide a consistent method for computing addresses so that
address computations don't need to be a part of load and address computations don't need to be a part of load and
store instructions in the IR.</li> store instructions in the IR.</li>

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docs/LangRef.html
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@ -1062,7 +1062,15 @@ declare signext i8 @returns_signed_char()
The caller shares the responsibility with the callee for ensuring that The caller shares the responsibility with the callee for ensuring that
these requirements are met. these requirements are met.
For further details, please see the discussion of the NoAlias response in For further details, please see the discussion of the NoAlias response in
<a href="AliasAnalysis.html#MustMayNo">alias analysis</a>.</dd> <a href="AliasAnalysis.html#MustMayNo">alias analysis</a>.<br>
<br>
Note that this definition of <tt>noalias<tt> is intentionally
similar to the definition of <tt>restrict<tt> in C99 for function
arguments, thought it is slightly weaker.
<br>
For function return values, C99's <tt>restrict</tt> is not meaningful,
while LLVM's <tt>noalias</tt> is.
</dd>
<dt><tt><b><a name="nocapture">nocapture</a></b></tt></dt> <dt><tt><b><a name="nocapture">nocapture</a></b></tt></dt>
<dd>This indicates that the callee does not make any copies of the pointer <dd>This indicates that the callee does not make any copies of the pointer
@ -2397,7 +2405,8 @@ has undefined behavior.</p>
<li>An instruction with externally visible side effects depends on the most <li>An instruction with externally visible side effects depends on the most
recent preceding instruction with externally visible side effects, following recent preceding instruction with externally visible side effects, following
the order in the IR. (This includes volatile loads and stores.)</li> the order in the IR. (This includes
<a href="#volatile">volatile operations</a>.)</li>
<li>An instruction <i>control-depends</i> on a <li>An instruction <i>control-depends</i> on a
<a href="#terminators">terminator instruction</a> <a href="#terminators">terminator instruction</a>