diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -53,6 +53,7 @@
 #include "llvm/IR/Intrinsics.h"
 #include "llvm/IR/IntrinsicsAArch64.h"
 #include "llvm/IR/IntrinsicsX86.h"
+#include "llvm/IR/KnowledgeRetention.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Metadata.h"
 #include "llvm/IR/Module.h"
@@ -660,6 +661,22 @@
     return !TrueValues.contains(APInt::getNullValue(CI->getBitWidth()));
   };
 
+  if (Q.DT)
+    for (auto &U : V->uses()) {
+      if (auto *Intr = dyn_cast<IntrinsicInst>(U.getUser()))
+        if (Intr->getIntrinsicID() == Intrinsic::assume) {
+          RetainedKnowledge RK =
+              getKnowledgeFromOperandInAssume(*Intr, U.getOperandNo());
+          if ((RK.AttrKind == Attribute::NonNull ||
+               (RK.AttrKind == Attribute::Dereferenceable &&
+                !llvm::NullPointerIsDefined(
+                    Intr->getFunction(),
+                    V->getType()->getPointerAddressSpace()))) &&
+              Q.DT->dominates(Intr, Q.CxtI))
+            return true;
+        }
+    }
+
   for (auto &AssumeVH : Q.AC->assumptionsFor(V)) {
     if (!AssumeVH)
       continue;
diff --git a/llvm/test/Analysis/ValueTracking/assume.ll b/llvm/test/Analysis/ValueTracking/assume.ll
--- a/llvm/test/Analysis/ValueTracking/assume.ll
+++ b/llvm/test/Analysis/ValueTracking/assume.ll
@@ -21,9 +21,14 @@
 
 define void @assume_not() {
 ; CHECK-LABEL: @assume_not(
+; CHECK-NEXT:  entry-block:
+; CHECK-NEXT:    [[TMP0:%.*]] = call i1 @get_val()
+; CHECK-NEXT:    [[TMP1:%.*]] = xor i1 [[TMP0]], true
+; CHECK-NEXT:    call void @llvm.assume(i1 [[TMP1]])
+; CHECK-NEXT:    ret void
+;
 entry-block:
   %0 = call i1 @get_val()
-; CHECK: call void @llvm.assume
   %1 = xor i1 %0, true
   call void @llvm.assume(i1 %1)
   ret void
@@ -31,3 +36,60 @@
 
 declare i1 @get_val()
 declare void @llvm.assume(i1)
+
+define dso_local i1 @test1(i32* readonly %0) {
+; CHECK-LABEL: @test1(
+; CHECK-NEXT:    call void @llvm.assume(i1 true) [ "nonnull"(i32* [[TMP0:%.*]]) ]
+; CHECK-NEXT:    ret i1 false
+;
+  call void @llvm.assume(i1 true) ["nonnull"(i32* %0)]
+  %2 = icmp eq i32* %0, null
+  ret i1 %2
+}
+
+; FIXME: We could fold the icmp in the following example.
+; because if the icmp is reached the assume will necessarly be reached.
+define dso_local i1 @test2(i32* readonly %0) {
+; CHECK-LABEL: @test2(
+; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i32* [[TMP0:%.*]], null
+; CHECK-NEXT:    call void @llvm.assume(i1 true) [ "nonnull"(i32* [[TMP0]]) ]
+; CHECK-NEXT:    ret i1 [[TMP2]]
+;
+  %2 = icmp eq i32* %0, null
+  call void @llvm.assume(i1 true) ["nonnull"(i32* %0)]
+  ret i1 %2
+}
+
+define dso_local i32 @test4(i32* readonly %0, i1 %cond) {
+; CHECK-LABEL: @test4(
+; CHECK-NEXT:    call void @llvm.assume(i1 true) [ "dereferenceable"(i32* [[TMP0:%.*]], i32 4) ]
+; CHECK-NEXT:    br i1 [[COND:%.*]], label [[A:%.*]], label [[B:%.*]]
+; CHECK:       B:
+; CHECK-NEXT:    br label [[A]]
+; CHECK:       A:
+; CHECK-NEXT:    br i1 false, label [[TMP4:%.*]], label [[TMP2:%.*]]
+; CHECK:       2:
+; CHECK-NEXT:    [[TMP3:%.*]] = load i32, i32* [[TMP0]], align 4
+; CHECK-NEXT:    br label [[TMP4]]
+; CHECK:       4:
+; CHECK-NEXT:    [[TMP5:%.*]] = phi i32 [ [[TMP3]], [[TMP2]] ], [ 0, [[A]] ]
+; CHECK-NEXT:    ret i32 [[TMP5]]
+;
+  call void @llvm.assume(i1 true) ["dereferenceable"(i32* %0, i32 4)]
+  br i1 %cond, label %A, label %B
+
+B:
+  br label %A
+
+A:
+  %2 = icmp eq i32* %0, null
+  br i1 %2, label %5, label %3
+
+3:                                                ; preds = %1
+  %4 = load i32, i32* %0, align 4
+  br label %5
+
+5:                                                ; preds = %1, %3
+  %6 = phi i32 [ %4, %3 ], [ 0, %A ]
+  ret i32 %6
+}