[PATCH] D9381: llvm.noalias - SCEV can look through it

[Hal Finkel via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL275037: Teach SCEV to look through returned-argument functions (authored by hfinkel).

Changed prior to commit:
  http://reviews.llvm.org/D9381?vs=63349&id=63452#toc

Repository:
  rL LLVM

http://reviews.llvm.org/D9381

Files:
  llvm/trunk/lib/Analysis/ScalarEvolution.cpp
  llvm/trunk/test/Analysis/ScalarEvolution/returned.ll

Index: llvm/trunk/lib/Analysis/ScalarEvolution.cpp
===================================================================
--- llvm/trunk/lib/Analysis/ScalarEvolution.cpp
+++ llvm/trunk/lib/Analysis/ScalarEvolution.cpp
@@ -5225,6 +5225,13 @@
     if (isa<Instruction>(U))
       return createNodeForSelectOrPHI(cast<Instruction>(U), U->getOperand(0),
                                       U->getOperand(1), U->getOperand(2));
+    break;
+
+  case Instruction::Call:
+  case Instruction::Invoke:
+    if (Value *RV = CallSite(U).getReturnedArgOperand())
+      return getSCEV(RV);
+    break;
   }
 
   return getUnknown(V);
Index: llvm/trunk/test/Analysis/ScalarEvolution/returned.ll
===================================================================
--- llvm/trunk/test/Analysis/ScalarEvolution/returned.ll
+++ llvm/trunk/test/Analysis/ScalarEvolution/returned.ll
@@ -0,0 +1,16 @@
+; RUN: opt < %s -S -analyze -scalar-evolution | FileCheck %s
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
+
+define i8* @foo(i32 %no, i8* nocapture %d) nounwind {
+entry:
+  %v = call i8* @func1(i8* %d)
+  %w = getelementptr i8, i8* %v, i64 5
+  ret i8* %w
+}
+
+; CHECK-LABEL: Classifying expressions for: @foo
+; CHECK: %w = getelementptr i8, i8* %v, i64 5
+; CHECK-NEXT: (5 + %d)
+
+declare i8* @func1(i8* returned) nounwind argmemonly
+


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