Introduce two command-line flags for the instrumentation pass to control whether...

The new command line flags are -dfsan-ignore-pointer-label-on-store and -dfsan-ignore-pointer-label-on-load. Their default value matches the current labelling scheme.

Additionally, the function __dfsan_union_load is marked as readonly.

Patch by Lorenzo Martignoni!

Differential Revision: http://llvm-reviews.chandlerc.com/D2187

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195382 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp b/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
index 9b9e725cde81bb8f45d429408ff8f2ef591ba898..c539be93a7a33c70e5f64da71b945ca951a774c3 100644 (file)
--- a/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
+++ b/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
@@ -96,6 +96,22 @@ static cl::opt<bool> ClArgsABI(
     cl::desc("Use the argument ABI rather than the TLS ABI"),
     cl::Hidden);
 
+// Controls whether the pass includes or ignores the labels of pointers in load
+// instructions.
+static cl::opt<bool> ClCombinePointerLabelsOnLoad(
+    "dfsan-combine-pointer-labels-on-load",
+    cl::desc("Combine the label of the pointer with the label of the data when "
+             "loading from memory."),
+    cl::Hidden, cl::init(true));
+
+// Controls whether the pass includes or ignores the labels of pointers in
+// stores instructions.
+static cl::opt<bool> ClCombinePointerLabelsOnStore(
+    "dfsan-combine-pointer-labels-on-store",
+    cl::desc("Combine the label of the pointer with the label of the data when "
+             "storing in memory."),
+    cl::Hidden, cl::init(false));
+
 static cl::opt<bool> ClDebugNonzeroLabels(
     "dfsan-debug-nonzero-labels",
     cl::desc("Insert calls to __dfsan_nonzero_label on observing a parameter, "
@@ -505,6 +521,7 @@ bool DataFlowSanitizer::runOnModule(Module &M) {
   DFSanUnionLoadFn =
       Mod->getOrInsertFunction("__dfsan_union_load", DFSanUnionLoadFnTy);
   if (Function *F = dyn_cast<Function>(DFSanUnionLoadFn)) {
+    F->addAttribute(AttributeSet::FunctionIndex, Attribute::ReadOnly);
     F->addAttribute(AttributeSet::ReturnIndex, Attribute::ZExt);
   }
   DFSanUnimplementedFn =
@@ -978,14 +995,15 @@ void DFSanVisitor::visitLoadInst(LoadInst &LI) {
     Align = 1;
   }
   IRBuilder<> IRB(&LI);
-  Value *LoadedShadow =
-      DFSF.loadShadow(LI.getPointerOperand(), Size, Align, &LI);
-  Value *PtrShadow = DFSF.getShadow(LI.getPointerOperand());
-  Value *CombinedShadow = DFSF.DFS.combineShadows(LoadedShadow, PtrShadow, &LI);
-  if (CombinedShadow != DFSF.DFS.ZeroShadow)
-    DFSF.NonZeroChecks.insert(CombinedShadow);
-
-  DFSF.setShadow(&LI, CombinedShadow);
+  Value *Shadow = DFSF.loadShadow(LI.getPointerOperand(), Size, Align, &LI);
+  if (ClCombinePointerLabelsOnLoad) {
+    Value *PtrShadow = DFSF.getShadow(LI.getPointerOperand());
+    Shadow = DFSF.DFS.combineShadows(Shadow, PtrShadow, &LI);
+  }
+  if (Shadow != DFSF.DFS.ZeroShadow)
+    DFSF.NonZeroChecks.insert(Shadow);
+
+  DFSF.setShadow(&LI, Shadow);
 }
 
 void DFSanFunction::storeShadow(Value *Addr, uint64_t Size, uint64_t Align,
@@ -1050,8 +1068,13 @@ void DFSanVisitor::visitStoreInst(StoreInst &SI) {
   } else {
     Align = 1;
   }
-  DFSF.storeShadow(SI.getPointerOperand(), Size, Align,
-                   DFSF.getShadow(SI.getValueOperand()), &SI);
+
+  Value* Shadow = DFSF.getShadow(SI.getValueOperand());
+  if (ClCombinePointerLabelsOnStore) {
+    Value *PtrShadow = DFSF.getShadow(SI.getPointerOperand());
+    Shadow = DFSF.DFS.combineShadows(Shadow, PtrShadow, &SI);
+  }
+  DFSF.storeShadow(SI.getPointerOperand(), Size, Align, Shadow, &SI);
 }
 
 void DFSanVisitor::visitBinaryOperator(BinaryOperator &BO) {

diff --git a/test/Instrumentation/DataFlowSanitizer/load.ll b/test/Instrumentation/DataFlowSanitizer/load.ll
index 6431213f8be5e8a51eb3818dec8f8adca00065d3..6cd5151b1260b814ff3de2b5c936b307aec29dc1 100644 (file)
--- a/test/Instrumentation/DataFlowSanitizer/load.ll
+++ b/test/Instrumentation/DataFlowSanitizer/load.ll
@@ -1,81 +1,155 @@
-; RUN: opt < %s -dfsan -S | FileCheck %s
+; RUN: opt < %s -dfsan -dfsan-combine-pointer-labels-on-load=1 -S | FileCheck %s --check-prefix=COMBINE_PTR_LABEL
+; RUN: opt < %s -dfsan -dfsan-combine-pointer-labels-on-load=0 -S | FileCheck %s --check-prefix=NO_COMBINE_PTR_LABEL
 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-S128"
 
 define i8 @load8(i8* %p) {
-  ; CHECK: @"dfs$load8"
-  ; CHECK: ptrtoint
-  ; CHECK: and
-  ; CHECK: mul
-  ; CHECK: inttoptr
-  ; CHECK: load
-  ; CHECK: store{{.*}}__dfsan_retval_tls
-  ; CHECK: ret i8
+  ; COMBINE_PTR_LABEL: @"dfs$load8"
+  ; COMBINE_PTR_LABEL: load i16*
+  ; COMBINE_PTR_LABEL: ptrtoint i8* {{.*}} to i64
+  ; COMBINE_PTR_LABEL: and i64
+  ; COMBINE_PTR_LABEL: mul i64
+  ; COMBINE_PTR_LABEL: inttoptr i64
+  ; COMBINE_PTR_LABEL: load i16*
+  ; COMBINE_PTR_LABEL: icmp ne i16
+  ; COMBINE_PTR_LABEL: call zeroext i16 @__dfsan_union
+  ; COMBINE_PTR_LABEL: load i8*
+  ; COMBINE_PTR_LABEL: store i16 {{.*}} @__dfsan_retval_tls
+  ; COMBINE_PTR_LABEL: ret i8
+
+  ; NO_COMBINE_PTR_LABEL: @"dfs$load8"
+  ; NO_COMBINE_PTR_LABEL: ptrtoint i8*
+  ; NO_COMBINE_PTR_LABEL: and i64
+  ; NO_COMBINE_PTR_LABEL: mul i64
+  ; NO_COMBINE_PTR_LABEL: inttoptr i64 {{.*}} to i16*
+  ; NO_COMBINE_PTR_LABEL: load i16*
+  ; NO_COMBINE_PTR_LABEL: load i8*
+  ; NO_COMBINE_PTR_LABEL: store i16 {{.*}} @__dfsan_retval_tls
+  ; NO_COMBINE_PTR_LABEL: ret i8
+
   %a = load i8* %p
   ret i8 %a
 }
 
 define i16 @load16(i16* %p) {
-  ; CHECK: @"dfs$load16"
-  ; CHECK: ptrtoint
-  ; CHECK: and
-  ; CHECK: mul
-  ; CHECK: inttoptr
-  ; CHECK: load
-  ; CHECK: load
-  ; CHECK: icmp ne
-  ; CHECK: call{{.*}}__dfsan_union
-  ; CHECK: store{{.*}}__dfsan_retval_tls
-  ; CHECK: ret i16
+  ; COMBINE_PTR_LABEL: @"dfs$load16"
+  ; COMBINE_PTR_LABEL: ptrtoint i16*
+  ; COMBINE_PTR_LABEL: and i64
+  ; COMBINE_PTR_LABEL: mul i64
+  ; COMBINE_PTR_LABEL: inttoptr i64 {{.*}} i16*
+  ; COMBINE_PTR_LABEL: getelementptr i16
+  ; COMBINE_PTR_LABEL: load i16*
+  ; COMBINE_PTR_LABEL: load i16*
+  ; COMBINE_PTR_LABEL: icmp ne
+  ; COMBINE_PTR_LABEL: call {{.*}} @__dfsan_union
+  ; COMBINE_PTR_LABEL: icmp ne i16
+  ; COMBINE_PTR_LABEL: call {{.*}} @__dfsan_union
+  ; COMBINE_PTR_LABEL: load i16*
+  ; COMBINE_PTR_LABEL: store {{.*}} @__dfsan_retval_tls
+  ; COMBINE_PTR_LABEL: ret i16
+
+  ; NO_COMBINE_PTR_LABEL: @"dfs$load16"
+  ; NO_COMBINE_PTR_LABEL: ptrtoint i16*
+  ; NO_COMBINE_PTR_LABEL: and i64
+  ; NO_COMBINE_PTR_LABEL: mul i64
+  ; NO_COMBINE_PTR_LABEL: inttoptr i64 {{.*}} i16*
+  ; NO_COMBINE_PTR_LABEL: getelementptr i16*
+  ; NO_COMBINE_PTR_LABEL: load i16*
+  ; NO_COMBINE_PTR_LABEL: load i16*
+  ; NO_COMBINE_PTR_LABEL: icmp ne i16
+  ; NO_COMBINE_PTR_LABEL: call {{.*}} @__dfsan_union
+  ; NO_COMBINE_PTR_LABEL: load i16*
+  ; NO_COMBINE_PTR_LABEL: store i16 {{.*}} @__dfsan_retval_tls
+  ; NO_COMBINE_PTR_LABEL: ret i16
+
   %a = load i16* %p
   ret i16 %a
 }
 
 define i32 @load32(i32* %p) {
-  ; CHECK: @"dfs$load32"
-  ; CHECK: ptrtoint
-  ; CHECK: and
-  ; CHECK: mul
-  ; CHECK: inttoptr
-  ; CHECK: bitcast
-  ; CHECK: load
-  ; CHECK: trunc
-  ; CHECK: shl
-  ; CHECK: lshr
-  ; CHECK: or
-  ; CHECK: icmp eq
+  ; COMBINE_PTR_LABEL: @"dfs$load32"
+  ; COMBINE_PTR_LABEL: ptrtoint i32*
+  ; COMBINE_PTR_LABEL: and i64
+  ; COMBINE_PTR_LABEL: mul i64
+  ; COMBINE_PTR_LABEL: inttoptr i64 {{.*}} i16*
+  ; COMBINE_PTR_LABEL: bitcast i16* {{.*}} i64*
+  ; COMBINE_PTR_LABEL: load i64*
+  ; COMBINE_PTR_LABEL: trunc i64 {{.*}} i16
+  ; COMBINE_PTR_LABEL: shl i64
+  ; COMBINE_PTR_LABEL: lshr i64
+  ; COMBINE_PTR_LABEL: or i64
+  ; COMBINE_PTR_LABEL: icmp eq i64
+  ; COMBINE_PTR_LABEL: icmp ne i16
+  ; COMBINE_PTR_LABEL: call {{.*}} @__dfsan_union
+  ; COMBINE_PTR_LABEL: load i32*
+  ; COMBINE_PTR_LABEL: store i16 {{.*}} @__dfsan_retval_tls
+  ; COMBINE_PTR_LABEL: ret i32
+  ; COMBINE_PTR_LABEL: call {{.*}} @__dfsan_union_load
 
-  ; CHECK: store{{.*}}__dfsan_retval_tls
-  ; CHECK: ret i32
-
-  ; CHECK: call{{.*}}__dfsan_union_load
+  ; NO_COMBINE_PTR_LABEL: @"dfs$load32"
+  ; NO_COMBINE_PTR_LABEL: ptrtoint i32*
+  ; NO_COMBINE_PTR_LABEL: and i64
+  ; NO_COMBINE_PTR_LABEL: mul i64
+  ; NO_COMBINE_PTR_LABEL: inttoptr i64 {{.*}} i16*
+  ; NO_COMBINE_PTR_LABEL: bitcast i16* {{.*}} i64*
+  ; NO_COMBINE_PTR_LABEL: load i64*
+  ; NO_COMBINE_PTR_LABEL: trunc i64 {{.*}} i16
+  ; NO_COMBINE_PTR_LABEL: shl i64
+  ; NO_COMBINE_PTR_LABEL: lshr i64
+  ; NO_COMBINE_PTR_LABEL: or i64
+  ; NO_COMBINE_PTR_LABEL: icmp eq i64
+  ; NO_COMBINE_PTR_LABEL: load i32*
+  ; NO_COMBINE_PTR_LABEL: store i16 {{.*}} @__dfsan_retval_tls
+  ; NO_COMBINE_PTR_LABEL: ret i32
+  ; NO_COMBINE_PTR_LABEL: call {{.*}} @__dfsan_union_load
+  
 
   %a = load i32* %p
   ret i32 %a
 }
 
 define i64 @load64(i64* %p) {
-  ; CHECK: @"dfs$load64"
-  ; CHECK: ptrtoint
-  ; CHECK: and
-  ; CHECK: mul
-  ; CHECK: inttoptr
-  ; CHECK: bitcast
-  ; CHECK: load
-  ; CHECK: trunc
-  ; CHECK: shl
-  ; CHECK: lshr
-  ; CHECK: or
-  ; CHECK: icmp eq
-
-  ; CHECK: store{{.*}}__dfsan_retval_tls
-  ; CHECK: ret i64
+  ; COMBINE_PTR_LABEL: @"dfs$load64"
+  ; COMBINE_PTR_LABEL: ptrtoint i64*
+  ; COMBINE_PTR_LABEL: and i64
+  ; COMBINE_PTR_LABEL: mul i64
+  ; COMBINE_PTR_LABEL: inttoptr i64 {{.*}} i16*
+  ; COMBINE_PTR_LABEL: bitcast i16* {{.*}} i64*
+  ; COMBINE_PTR_LABEL: load i64*
+  ; COMBINE_PTR_LABEL: trunc i64 {{.*}} i16
+  ; COMBINE_PTR_LABEL: shl i64
+  ; COMBINE_PTR_LABEL: lshr i64
+  ; COMBINE_PTR_LABEL: or i64
+  ; COMBINE_PTR_LABEL: icmp eq i64
+  ; COMBINE_PTR_LABEL: icmp ne i16
+  ; COMBINE_PTR_LABEL: call {{.*}} @__dfsan_union
+  ; COMBINE_PTR_LABEL: load i64*
+  ; COMBINE_PTR_LABEL: store i16 {{.*}} @__dfsan_retval_tls
+  ; COMBINE_PTR_LABEL: ret i64
+  ; COMBINE_PTR_LABEL: call {{.*}} @__dfsan_union_load
+  ; COMBINE_PTR_LABEL: getelementptr i64* {{.*}} i64
+  ; COMBINE_PTR_LABEL: load i64*
+  ; COMBINE_PTR_LABEL: icmp eq i64
 
-  ; CHECK: call{{.*}}__dfsan_union_load
-
-  ; CHECK: getelementptr
-  ; CHECK: load
-  ; CHECK: icmp eq
+  ; NO_COMBINE_PTR_LABEL: @"dfs$load64"
+  ; NO_COMBINE_PTR_LABEL: ptrtoint i64*
+  ; NO_COMBINE_PTR_LABEL: and i64
+  ; NO_COMBINE_PTR_LABEL: mul i64
+  ; NO_COMBINE_PTR_LABEL: inttoptr i64 {{.*}} i16*
+  ; NO_COMBINE_PTR_LABEL: bitcast i16* {{.*}} i64*
+  ; NO_COMBINE_PTR_LABEL: load i64*
+  ; NO_COMBINE_PTR_LABEL: trunc i64 {{.*}} i16
+  ; NO_COMBINE_PTR_LABEL: shl i64
+  ; NO_COMBINE_PTR_LABEL: lshr i64
+  ; NO_COMBINE_PTR_LABEL: or i64
+  ; NO_COMBINE_PTR_LABEL: icmp eq i64
+  ; NO_COMBINE_PTR_LABEL: load i64*
+  ; NO_COMBINE_PTR_LABEL: store i16 {{.*}} @__dfsan_retval_tls
+  ; NO_COMBINE_PTR_LABEL: ret i64
+  ; NO_COMBINE_PTR_LABEL: call {{.*}} @__dfsan_union_load
+  ; NO_COMBINE_PTR_LABEL: getelementptr i64* {{.*}} i64
+  ; NO_COMBINE_PTR_LABEL: load i64*
+  ; NO_COMBINE_PTR_LABEL: icmp eq i64
 
   %a = load i64* %p
   ret i64 %a
-}
+}
\ No newline at end of file

diff --git a/test/Instrumentation/DataFlowSanitizer/store.ll b/test/Instrumentation/DataFlowSanitizer/store.ll
index 95091777a326664f4a4a08b2d7a460e7eb139d6d..8060537f3152af51f5270f61710e77648659a2b2 100644 (file)
--- a/test/Instrumentation/DataFlowSanitizer/store.ll
+++ b/test/Instrumentation/DataFlowSanitizer/store.ll
@@ -1,75 +1,146 @@
-; RUN: opt < %s -dfsan -S | FileCheck %s
+; RUN: opt < %s -dfsan -dfsan-combine-pointer-labels-on-store=1 -S | FileCheck %s --check-prefix=COMBINE_PTR_LABEL
+; RUN: opt < %s -dfsan -dfsan-combine-pointer-labels-on-store=0 -S | FileCheck %s --check-prefix=NO_COMBINE_PTR_LABEL
 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-S128"
 
 define void @store8(i8 %v, i8* %p) {
-  ; CHECK: @"dfs$store8"
-  ; CHECK: load{{.*}}__dfsan_arg_tls
-  ; CHECK: ptrtoint
-  ; CHECK: and
-  ; CHECK: mul
-  ; CHECK: inttoptr
-  ; CHECK: getelementptr
-  ; CHECK: store
-  ; CHECK: store
+  ; NO_COMBINE_PTR_LABEL: @"dfs$store8"
+  ; NO_COMBINE_PTR_LABEL: load i16* {{.*}} @__dfsan_arg_tls
+  ; NO_COMBINE_PTR_LABEL: ptrtoint i8* {{.*}} i64
+  ; NO_COMBINE_PTR_LABEL: and i64
+  ; NO_COMBINE_PTR_LABEL: mul i64
+  ; NO_COMBINE_PTR_LABEL: inttoptr i64 {{.*}} i16*
+  ; NO_COMBINE_PTR_LABEL: getelementptr i16*
+  ; NO_COMBINE_PTR_LABEL: store i16
+  ; NO_COMBINE_PTR_LABEL: store i8
+
+  ; COMBINE_PTR_LABEL: @"dfs$store8"
+  ; COMBINE_PTR_LABEL: load i16*
+  ; COMBINE_PTR_LABEL: load i16*
+  ; COMBINE_PTR_LABEL: icmp ne i16
+  ; COMBINE_PTR_LABEL: call {{.*}} @__dfsan_union
+  ; COMBINE_PTR_LABEL: ptrtoint i8* {{.*}} i64
+  ; COMBINE_PTR_LABEL: and i64
+  ; COMBINE_PTR_LABEL: mul i64
+  ; COMBINE_PTR_LABEL: inttoptr i64 {{.*}} i16*
+  ; COMBINE_PTR_LABEL: getelementptr i16*
+  ; COMBINE_PTR_LABEL: store i16
+  ; COMBINE_PTR_LABEL: store i8
+
   store i8 %v, i8* %p
   ret void
 }
 
 define void @store16(i16 %v, i16* %p) {
-  ; CHECK: @"dfs$store16"
-  ; CHECK: load{{.*}}__dfsan_arg_tls
-  ; CHECK: ptrtoint
-  ; CHECK: and
-  ; CHECK: mul
-  ; CHECK: inttoptr
-  ; CHECK: getelementptr
-  ; CHECK: store
-  ; CHECK: getelementptr
-  ; CHECK: store
-  ; CHECK: store
+  ; NO_COMBINE_PTR_LABEL: @"dfs$store16"
+  ; NO_COMBINE_PTR_LABEL: load i16* {{.*}} @__dfsan_arg_tls
+  ; NO_COMBINE_PTR_LABEL: ptrtoint i16* {{.*}} i64
+  ; NO_COMBINE_PTR_LABEL: and i64
+  ; NO_COMBINE_PTR_LABEL: mul i64
+  ; NO_COMBINE_PTR_LABEL: inttoptr i64 {{.*}} i16*
+  ; NO_COMBINE_PTR_LABEL: getelementptr i16*
+  ; NO_COMBINE_PTR_LABEL: store i16
+  ; NO_COMBINE_PTR_LABEL: getelementptr i16*
+  ; NO_COMBINE_PTR_LABEL: store i16
+  ; NO_COMBINE_PTR_LABEL: store i16
+
+  ; COMBINE_PTR_LABEL: @"dfs$store16"
+  ; COMBINE_PTR_LABEL: load i16* {{.*}} @__dfsan_arg_tls
+  ; COMBINE_PTR_LABEL: load i16* {{.*}} @__dfsan_arg_tls
+  ; COMBINE_PTR_LABEL: icmp ne i16
+  ; COMBINE_PTR_LABEL: call {{.*}} @__dfsan_union
+  ; COMBINE_PTR_LABEL: ptrtoint i16* {{.*}} i64
+  ; COMBINE_PTR_LABEL: and i64
+  ; COMBINE_PTR_LABEL: mul i64
+  ; COMBINE_PTR_LABEL: inttoptr i64 {{.*}} i16*
+  ; COMBINE_PTR_LABEL: getelementptr i16*
+  ; COMBINE_PTR_LABEL: store i16
+  ; COMBINE_PTR_LABEL: getelementptr i16*
+  ; COMBINE_PTR_LABEL: store i16
+  ; COMBINE_PTR_LABEL: store i16
+
   store i16 %v, i16* %p
   ret void
 }
 
 define void @store32(i32 %v, i32* %p) {
-  ; CHECK: @"dfs$store32"
-  ; CHECK: load{{.*}}__dfsan_arg_tls
-  ; CHECK: ptrtoint
-  ; CHECK: and
-  ; CHECK: mul
-  ; CHECK: inttoptr
-  ; CHECK: getelementptr
-  ; CHECK: store
-  ; CHECK: getelementptr
-  ; CHECK: store
-  ; CHECK: getelementptr
-  ; CHECK: store
-  ; CHECK: getelementptr
-  ; CHECK: store
-  ; CHECK: store
+  ; NO_COMBINE_PTR_LABEL: @"dfs$store32"
+  ; NO_COMBINE_PTR_LABEL: load i16* {{.*}} @__dfsan_arg_tls
+  ; NO_COMBINE_PTR_LABEL: ptrtoint i32* {{.*}} i64
+  ; NO_COMBINE_PTR_LABEL: and i64
+  ; NO_COMBINE_PTR_LABEL: mul i64
+  ; NO_COMBINE_PTR_LABEL: inttoptr i64 {{.*}} i16*
+  ; NO_COMBINE_PTR_LABEL: getelementptr i16*
+  ; NO_COMBINE_PTR_LABEL: store i16
+  ; NO_COMBINE_PTR_LABEL: getelementptr i16*
+  ; NO_COMBINE_PTR_LABEL: store i16
+  ; NO_COMBINE_PTR_LABEL: getelementptr i16*
+  ; NO_COMBINE_PTR_LABEL: store i16
+  ; NO_COMBINE_PTR_LABEL: getelementptr i16*
+  ; NO_COMBINE_PTR_LABEL: store i16
+  ; NO_COMBINE_PTR_LABEL: store i32
+
+  ; COMBINE_PTR_LABEL: @"dfs$store32"
+  ; COMBINE_PTR_LABEL: load i16* {{.*}} @__dfsan_arg_tls
+  ; COMBINE_PTR_LABEL: load i16* {{.*}} @__dfsan_arg_tls
+  ; COMBINE_PTR_LABEL: icmp ne i16
+  ; COMBINE_PTR_LABEL: call {{.*}} @__dfsan_union
+  ; COMBINE_PTR_LABEL: ptrtoint i32* {{.*}} i64
+  ; COMBINE_PTR_LABEL: and i64
+  ; COMBINE_PTR_LABEL: mul i64
+  ; COMBINE_PTR_LABEL: inttoptr i64 {{.*}} i16*
+  ; COMBINE_PTR_LABEL: getelementptr i16*
+  ; COMBINE_PTR_LABEL: store i16
+  ; COMBINE_PTR_LABEL: getelementptr i16*
+  ; COMBINE_PTR_LABEL: store i16
+  ; COMBINE_PTR_LABEL: getelementptr i16*
+  ; COMBINE_PTR_LABEL: store i16
+  ; COMBINE_PTR_LABEL: getelementptr i16*
+  ; COMBINE_PTR_LABEL: store i16
+  ; COMBINE_PTR_LABEL: store i32
+
   store i32 %v, i32* %p
   ret void
 }
 
 define void @store64(i64 %v, i64* %p) {
-  ; CHECK: @"dfs$store64"
-  ; CHECK: load{{.*}}__dfsan_arg_tls
-  ; CHECK: ptrtoint
-  ; CHECK: and
-  ; CHECK: mul
-  ; CHECK: inttoptr
-  ; CHECK: insertelement
-  ; CHECK: insertelement
-  ; CHECK: insertelement
-  ; CHECK: insertelement
-  ; CHECK: insertelement
-  ; CHECK: insertelement
-  ; CHECK: insertelement
-  ; CHECK: insertelement
-  ; CHECK: bitcast
-  ; CHECK: getelementptr
-  ; CHECK: store
-  ; CHECK: store
+  ; NO_COMBINE_PTR_LABEL: @"dfs$store64"
+  ; NO_COMBINE_PTR_LABEL: load i16* {{.*}} @__dfsan_arg_tls
+  ; NO_COMBINE_PTR_LABEL: ptrtoint i64* {{.*}} i64
+  ; NO_COMBINE_PTR_LABEL: and i64
+  ; NO_COMBINE_PTR_LABEL: mul i64
+  ; NO_COMBINE_PTR_LABEL: inttoptr i64 {{.*}} i16*
+  ; NO_COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; NO_COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; NO_COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; NO_COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; NO_COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; NO_COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; NO_COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; NO_COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; NO_COMBINE_PTR_LABEL: bitcast i16* {{.*}} <8 x i16>*
+  ; NO_COMBINE_PTR_LABEL: store i64
+
+  ; COMBINE_PTR_LABEL: @"dfs$store64"
+  ; COMBINE_PTR_LABEL: load i16* {{.*}} @__dfsan_arg_tls
+  ; COMBINE_PTR_LABEL: load i16* {{.*}} @__dfsan_arg_tls
+  ; COMBINE_PTR_LABEL: icmp ne i16
+  ; COMBINE_PTR_LABEL: call {{.*}} @__dfsan_union
+  ; COMBINE_PTR_LABEL: ptrtoint i64* {{.*}} i64
+  ; COMBINE_PTR_LABEL: and i64
+  ; COMBINE_PTR_LABEL: mul i64
+  ; COMBINE_PTR_LABEL: inttoptr i64 {{.*}} i16*
+  ; COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; COMBINE_PTR_LABEL: insertelement {{.*}} i16
+  ; COMBINE_PTR_LABEL: bitcast i16* {{.*}} <8 x i16>*
+  ; COMBINE_PTR_LABEL: store <8 x i16>
+  ; COMBINE_PTR_LABEL: store i64
+
   store i64 %v, i64* %p
   ret void
 }