When walking backwards to eliminate final stores to allocas at the end of a function...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138809 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Scalar/DeadStoreElimination.cpp b/lib/Transforms/Scalar/DeadStoreElimination.cpp
index 8559147b71610cda01583efe2f8074b344088625..d575a63a51f25b654483e6a6f3c5a1a583780c59 100644 (file)
--- a/lib/Transforms/Scalar/DeadStoreElimination.cpp
+++ b/lib/Transforms/Scalar/DeadStoreElimination.cpp
@@ -617,8 +617,9 @@ bool DSE::handleEndBlock(BasicBlock &BB) {
         DeleteDeadInstruction(Dead, *MD, &DeadStackObjects);
         ++NumFastStores;
         MadeChange = true;
-        continue;
       }
+
+      continue;
     }
     
     // Remove any dead non-memory-mutating instructions.

diff --git a/test/Transforms/DeadStoreElimination/2011-08-30-EndOfFunction.ll b/test/Transforms/DeadStoreElimination/2011-08-30-EndOfFunction.ll
new file mode 100644 (file)
index 0000000..c5cc101
--- /dev/null
+++ b/test/Transforms/DeadStoreElimination/2011-08-30-EndOfFunction.ll
@@ -0,0 +1,27 @@
+; RUN: opt -dse -S < %s | 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-n8:16:32:64"
+target triple = "x86_64-apple-darwin"
+
+%"class.std::auto_ptr" = type { i32* }
+
+; CHECK: @_Z3foov
+define void @_Z3foov(%"class.std::auto_ptr"* noalias nocapture sret %agg.result) uwtable ssp {
+_ZNSt8auto_ptrIiED1Ev.exit:
+  %temp.lvalue = alloca %"class.std::auto_ptr", align 8
+  call void @_Z3barv(%"class.std::auto_ptr"* sret %temp.lvalue)
+  %_M_ptr.i.i = getelementptr inbounds %"class.std::auto_ptr"* %temp.lvalue, i64 0, i32 0
+  %tmp.i.i = load i32** %_M_ptr.i.i, align 8, !tbaa !0
+; CHECK-NOT: store i32* null
+  store i32* null, i32** %_M_ptr.i.i, align 8, !tbaa !0
+  %_M_ptr.i.i4 = getelementptr inbounds %"class.std::auto_ptr"* %agg.result, i64 0, i32 0
+  store i32* %tmp.i.i, i32** %_M_ptr.i.i4, align 8, !tbaa !0
+; CHECK: ret void
+  ret void
+}
+
+declare void @_Z3barv(%"class.std::auto_ptr"* sret)
+
+!0 = metadata !{metadata !"any pointer", metadata !1}
+!1 = metadata !{metadata !"omnipotent char", metadata !2}
+!2 = metadata !{metadata !"Simple C/C++ TBAA", null}