[PATCH] D144035: [llvm] Ensure SCEV does not replace aliases with their aliasees

[Leonard Chan via Phabricator via cfe-commits]

leonardchan updated this revision to Diff 499668.
leonardchan marked an inline comment as done.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D144035/new/

https://reviews.llvm.org/D144035

Files:
  llvm/lib/Analysis/ScalarEvolution.cpp
  llvm/test/Analysis/ScalarEvolution/no-follow-alias.ll


Index: llvm/test/Analysis/ScalarEvolution/no-follow-alias.ll
===================================================================
--- /dev/null
+++ llvm/test/Analysis/ScalarEvolution/no-follow-alias.ll
@@ -0,0 +1,19 @@
+; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
+; RUN: opt -passes='print<scalar-evolution>' -disable-output %s 2>&1 | FileCheck %s
+
+target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64-unknown-linux-gnu"
+
+ at glob.private = private constant [32 x i32] zeroinitializer
+ at glob = linkonce_odr hidden alias [32 x i32], inttoptr (i64 add (i64 ptrtoint (ptr @glob.private to i64), i64 1234) to ptr)
+
+define hidden void @func(i64 %idx) local_unnamed_addr {
+; CHECK-LABEL: 'func'
+; CHECK-NEXT:  Classifying expressions for: @func
+; CHECK-NEXT:    %arrayidx = getelementptr inbounds [32 x i32], ptr @glob, i64 0, i64 %idx
+; CHECK-NEXT:    --> ((4 * %idx) + @glob) U: [0,-1) S: [-9223372036854775808,9223372036854775807)
+; CHECK-NEXT:  Determining loop execution counts for: @func
+;
+  %arrayidx = getelementptr inbounds [32 x i32], ptr @glob, i64 0, i64 %idx
+  ret void
+}
Index: llvm/lib/Analysis/ScalarEvolution.cpp
===================================================================
--- llvm/lib/Analysis/ScalarEvolution.cpp
+++ llvm/lib/Analysis/ScalarEvolution.cpp
@@ -7449,10 +7449,6 @@
   } else if (ConstantInt *CI = dyn_cast<ConstantInt>(V))
     return getConstant(CI);
   else if (GlobalAlias *GA = dyn_cast<GlobalAlias>(V)) {
-    if (!GA->isInterposable()) {
-      Ops.push_back(GA->getAliasee());
-      return nullptr;
-    }
     return getUnknown(V);
   } else if (!isa<ConstantExpr>(V))
     return getUnknown(V);
@@ -7639,7 +7635,7 @@
   } else if (ConstantInt *CI = dyn_cast<ConstantInt>(V))
     return getConstant(CI);
   else if (GlobalAlias *GA = dyn_cast<GlobalAlias>(V))
-    return GA->isInterposable() ? getUnknown(V) : getSCEV(GA->getAliasee());
+    return getUnknown(V);
   else if (!isa<ConstantExpr>(V))
     return getUnknown(V);
 


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