diff --git a/llvm/include/llvm/ADT/APInt.h b/llvm/include/llvm/ADT/APInt.h
--- a/llvm/include/llvm/ADT/APInt.h
+++ b/llvm/include/llvm/ADT/APInt.h
@@ -1109,6 +1109,8 @@
   APInt uadd_sat(const APInt &RHS) const;
   APInt ssub_sat(const APInt &RHS) const;
   APInt usub_sat(const APInt &RHS) const;
+  APInt smul_sat(const APInt &RHS) const;
+  APInt umul_sat(const APInt &RHS) const;
 
   /// Array-indexing support.
   ///
diff --git a/llvm/lib/Support/APInt.cpp b/llvm/lib/Support/APInt.cpp
--- a/llvm/lib/Support/APInt.cpp
+++ b/llvm/lib/Support/APInt.cpp
@@ -2048,6 +2048,27 @@
   return APInt(BitWidth, 0);
 }
 
+APInt APInt::smul_sat(const APInt &RHS) const {
+  bool Overflow;
+  APInt Res = smul_ov(RHS, Overflow);
+  if (!Overflow)
+    return Res;
+
+  // The result is negative if one and only one of inputs is negative.
+  bool ResIsNegative = isNegative() ^ RHS.isNegative();
+
+  return ResIsNegative ? APInt::getSignedMinValue(BitWidth)
+                       : APInt::getSignedMaxValue(BitWidth);
+}
+
+APInt APInt::umul_sat(const APInt &RHS) const {
+  bool Overflow;
+  APInt Res = umul_ov(RHS, Overflow);
+  if (!Overflow)
+    return Res;
+
+  return APInt::getMaxValue(BitWidth);
+}
 
 void APInt::fromString(unsigned numbits, StringRef str, uint8_t radix) {
   // Check our assumptions here
diff --git a/llvm/unittests/ADT/APIntTest.cpp b/llvm/unittests/ADT/APIntTest.cpp
--- a/llvm/unittests/ADT/APIntTest.cpp
+++ b/llvm/unittests/ADT/APIntTest.cpp
@@ -1197,6 +1197,24 @@
   EXPECT_EQ(APInt(8, 127), AP_100.ssub_sat(-AP_100));
   EXPECT_EQ(APInt(8, -128), (-AP_100).ssub_sat(AP_100));
   EXPECT_EQ(APInt(8, -128), APInt(8, -128).ssub_sat(APInt(8, 127)));
+
+  EXPECT_EQ(APInt(8, 250), APInt(8, 50).umul_sat(APInt(8, 5)));
+  EXPECT_EQ(APInt(8, 255), APInt(8, 50).umul_sat(APInt(8, 6)));
+  EXPECT_EQ(APInt(8, 255), APInt(8, -128).umul_sat(APInt(8, 3)));
+  EXPECT_EQ(APInt(8, 255), APInt(8, 3).umul_sat(APInt(8, -128)));
+  EXPECT_EQ(APInt(8, 255), APInt(8, -128).umul_sat(APInt(8, -128)));
+
+  EXPECT_EQ(APInt(8, 125), APInt(8, 25).smul_sat(APInt(8, 5)));
+  EXPECT_EQ(APInt(8, 127), APInt(8, 25).smul_sat(APInt(8, 6)));
+  EXPECT_EQ(APInt(8, 127), APInt(8, 127).smul_sat(APInt(8, 127)));
+  EXPECT_EQ(APInt(8, -125), APInt(8, -25).smul_sat(APInt(8, 5)));
+  EXPECT_EQ(APInt(8, -125), APInt(8, 25).smul_sat(APInt(8, -5)));
+  EXPECT_EQ(APInt(8, 125), APInt(8, -25).smul_sat(APInt(8, -5)));
+  EXPECT_EQ(APInt(8, 125), APInt(8, 25).smul_sat(APInt(8, 5)));
+  EXPECT_EQ(APInt(8, -128), APInt(8, -25).smul_sat(APInt(8, 6)));
+  EXPECT_EQ(APInt(8, -128), APInt(8, 25).smul_sat(APInt(8, -6)));
+  EXPECT_EQ(APInt(8, 127), APInt(8, -25).smul_sat(APInt(8, -6)));
+  EXPECT_EQ(APInt(8, 127), APInt(8, 25).smul_sat(APInt(8, 6)));
 }
 
 TEST(APIntTest, FromArray) {