[PATCH] D87685: [Scalarizer] Avoid changing name of non-instructions

[Bjorn Pettersson via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rGaa8be5aeead7: [Scalarizer] Avoid changing name of non-instructions (authored by bjope).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D87685/new/

https://reviews.llvm.org/D87685

Files:
  llvm/lib/Transforms/Scalar/Scalarizer.cpp
  llvm/test/Transforms/Scalarizer/global-bug-2.ll


Index: llvm/test/Transforms/Scalarizer/global-bug-2.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/Scalarizer/global-bug-2.ll
@@ -0,0 +1,20 @@
+; RUN: opt < %s -scalarizer -S -o - | FileCheck %s
+; RUN: opt < %s -passes='function(scalarizer)' -S | FileCheck %s
+
+; The scalarizer used to change the name of the global variable
+; Check that the we don't do that any longer.
+;
+; CHECK: @c.a = global i16 0, align 1
+
+ at c.a = global i16 0, align 1
+
+define void @c() {
+entry:
+  br label %for.cond1
+
+for.cond1:                                        ; preds = %for.cond1, %entry
+  %d.sroa.0.0 = phi <4 x i16*> [ <i16* @c.a, i16* @c.a, i16* @c.a, i16* @c.a>, %entry ], [ %d.sroa.0.1.vec.insert, %for.cond1 ]
+  %d.sroa.0.0.vec.extract = extractelement <4 x i16*> %d.sroa.0.0, i32 0
+  %d.sroa.0.1.vec.insert = shufflevector <4 x i16*> <i16* @c.a, i16* null, i16* undef, i16* undef>, <4 x i16*> %d.sroa.0.0, <4 x i32> <i32 0, i32 1, i32 6, i32 7>
+  br label %for.cond1
+}
Index: llvm/lib/Transforms/Scalar/Scalarizer.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/Scalarizer.cpp
+++ llvm/lib/Transforms/Scalar/Scalarizer.cpp
@@ -398,7 +398,8 @@
         continue;
 
       Instruction *Old = cast<Instruction>(V);
-      CV[I]->takeName(Old);
+      if (isa<Instruction>(CV[I]))
+        CV[I]->takeName(Old);
       Old->replaceAllUsesWith(CV[I]);
       PotentiallyDeadInstrs.emplace_back(Old);
     }


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