<div dir="ltr"><br><br><div class="gmail_quote">On Mon, Apr 13, 2015 at 4:32 PM Daniel Berlin <<a href="mailto:dberlin@dberlin.org">dberlin@dberlin.org</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Author: dannyb<br>
Date: Mon Apr 13 18:25:41 2015<br>
New Revision: 234814<br>
<br>
URL: <a href="http://llvm.org/viewvc/llvm-project?rev=234814&view=rev" target="_blank">http://llvm.org/viewvc/llvm-project?rev=234814&view=rev</a><br>
Log:<br>
Add new getModRefInfo API to determine whether an Instruction and a call modify the same memory<br>
<br>
Modified:<br>
    llvm/trunk/include/llvm/Analysis/AliasAnalysis.h<br>
    llvm/trunk/lib/Analysis/AliasAnalysis.cpp<br>
<br>
Modified: llvm/trunk/include/llvm/Analysis/AliasAnalysis.h<br>
URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Analysis/AliasAnalysis.h?rev=234814&r1=234813&r2=234814&view=diff" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Analysis/AliasAnalysis.h?rev=234814&r1=234813&r2=234814&view=diff</a><br>
==============================================================================<br>
--- llvm/trunk/include/llvm/Analysis/AliasAnalysis.h (original)<br>
+++ llvm/trunk/include/llvm/Analysis/AliasAnalysis.h Mon Apr 13 18:25:41 2015<br>
@@ -503,6 +503,10 @@ public:<br>
   ModRefResult getModRefInfo(const VAArgInst* I, const Value* P, uint64_t Size){<br>
     return getModRefInfo(I, Location(P, Size));<br>
   }<br>
+  /// getModRefInfo - Return information about whether a call and an instruction<br>
+  /// may refer to the same memory locations.<br></blockquote><div><br></div><div>Please follow the new doxygen coding standards.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
+  ModRefResult getModRefInfo(Instruction *I,<br>
+                             ImmutableCallSite Call);<br>
<br>
   /// getModRefInfo - Return information about whether two call sites may refer<br>
   /// to the same set of memory locations.  See<br>
<br>
Modified: llvm/trunk/lib/Analysis/AliasAnalysis.cpp<br>
URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/AliasAnalysis.cpp?rev=234814&r1=234813&r2=234814&view=diff" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/AliasAnalysis.cpp?rev=234814&r1=234813&r2=234814&view=diff</a><br>
==============================================================================<br>
--- llvm/trunk/lib/Analysis/AliasAnalysis.cpp (original)<br>
+++ llvm/trunk/lib/Analysis/AliasAnalysis.cpp Mon Apr 13 18:25:41 2015<br>
@@ -82,6 +82,23 @@ void AliasAnalysis::addEscapingUse(Use &<br>
   AA->addEscapingUse(U);<br>
 }<br>
<br>
+AliasAnalysis::ModRefResult<br>
+AliasAnalysis::getModRefInfo(Instruction *I, ImmutableCallSite Call) {<br>
+  // We may have two calls<br>
+  if (auto CS = ImmutableCallSite(I)) {<br>
+    // Check if the two calls modify the same memory<br>
+    return getModRefInfo(Call, CS);<br>
+  } else {<br>
+    // Otherwise, check if the call modifies or references the<br>
+    // location this memory access defines.  The best we can say<br>
+    // is that if the call references what this instruction<br>
+    // defines, it must be clobbered by this location.<br>
+    const AliasAnalysis::Location DefLoc = AA->getLocation(I);<br>
+    if (getModRefInfo(Call, DefLoc) != AliasAnalysis::NoModRef)<br>
+      return AliasAnalysis::ModRef;<br>
+  }<br>
+  return AliasAnalysis::NoModRef;<br>
+}<br>
<br>
 AliasAnalysis::ModRefResult<br>
 AliasAnalysis::getModRefInfo(ImmutableCallSite CS,<br>
<br>
<br>
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</blockquote></div></div>