diff --git a/clang/include/clang/Basic/TargetInfo.h b/clang/include/clang/Basic/TargetInfo.h
index 374595edd2ce4..e1ef7454f0166 100644
--- a/clang/include/clang/Basic/TargetInfo.h
+++ b/clang/include/clang/Basic/TargetInfo.h
@@ -267,6 +267,9 @@ class TargetInfo : public TransferrableTargetInfo,
   LLVM_PREFERRED_TYPE(bool)
   unsigned AllowAMDGPUUnsafeFPAtomics : 1;
 
+  LLVM_PREFERRED_TYPE(bool)
+  unsigned HasUnalignedAccess : 1;
+
   unsigned ARMCDECoprocMask : 8;
 
   unsigned MaxOpenCLWorkGroupSize;
@@ -859,6 +862,18 @@ class TargetInfo : public TransferrableTargetInfo,
     return PointerWidth;
   }
 
+  /// Return true iff unaligned accesses are a single instruction (rather than
+  /// a synthesized sequence).
+  bool hasUnalignedAccess() const { return HasUnalignedAccess; }
+
+  /// Return true iff unaligned accesses are cheap. This affects placement and
+  /// size of bitfield loads/stores. (Not the ABI-mandated placement of
+  /// the bitfields themselves.)
+  bool hasCheapUnalignedBitFieldAccess() const {
+    // Simply forward to the unaligned access getter.
+    return hasUnalignedAccess();
+  }
+
   /// \brief Returns the default value of the __USER_LABEL_PREFIX__ macro,
   /// which is the prefix given to user symbols by default.
   ///
diff --git a/clang/lib/Basic/TargetInfo.cpp b/clang/lib/Basic/TargetInfo.cpp
index 5d9055174c089..f96956f31d50d 100644
--- a/clang/lib/Basic/TargetInfo.cpp
+++ b/clang/lib/Basic/TargetInfo.cpp
@@ -157,6 +157,7 @@ TargetInfo::TargetInfo(const llvm::Triple &T) : Triple(T) {
   HasAArch64SVETypes = false;
   HasRISCVVTypes = false;
   AllowAMDGPUUnsafeFPAtomics = false;
+  HasUnalignedAccess = false;
   ARMCDECoprocMask = 0;
 
   // Default to no types using fpret.
diff --git a/clang/lib/Basic/Targets/AArch64.cpp b/clang/lib/Basic/Targets/AArch64.cpp
index 1c3199bd76eed..1569b5e04b770 100644
--- a/clang/lib/Basic/Targets/AArch64.cpp
+++ b/clang/lib/Basic/Targets/AArch64.cpp
@@ -188,6 +188,8 @@ AArch64TargetInfo::AArch64TargetInfo(const llvm::Triple &Triple,
   assert(UseBitFieldTypeAlignment && "bitfields affect type alignment");
   UseZeroLengthBitfieldAlignment = true;
 
+  HasUnalignedAccess = true;
+
   // AArch64 targets default to using the ARM C++ ABI.
   TheCXXABI.set(TargetCXXABI::GenericAArch64);
 
@@ -496,7 +498,7 @@ void AArch64TargetInfo::getTargetDefines(const LangOptions &Opts,
   if (HasPAuthLR)
     Builder.defineMacro("__ARM_FEATURE_PAUTH_LR", "1");
 
-  if (HasUnaligned)
+  if (HasUnalignedAccess)
     Builder.defineMacro("__ARM_FEATURE_UNALIGNED", "1");
 
   if ((FPU & NeonMode) && HasFullFP16)
@@ -921,7 +923,8 @@ bool AArch64TargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
       HasSM4 = true;
     }
     if (Feature == "+strict-align")
-      HasUnaligned = false;
+      HasUnalignedAccess = false;
+
     // All predecessor archs are added but select the latest one for ArchKind.
     if (Feature == "+v8a" && ArchInfo->Version < llvm::AArch64::ARMV8A.Version)
       ArchInfo = &llvm::AArch64::ARMV8A;
diff --git a/clang/lib/Basic/Targets/AArch64.h b/clang/lib/Basic/Targets/AArch64.h
index 542894c66412d..12fb50286f751 100644
--- a/clang/lib/Basic/Targets/AArch64.h
+++ b/clang/lib/Basic/Targets/AArch64.h
@@ -38,7 +38,6 @@ class LLVM_LIBRARY_VISIBILITY AArch64TargetInfo : public TargetInfo {
   bool HasSHA2 = false;
   bool HasSHA3 = false;
   bool HasSM4 = false;
-  bool HasUnaligned = true;
   bool HasFullFP16 = false;
   bool HasDotProd = false;
   bool HasFP16FML = false;
diff --git a/clang/lib/Basic/Targets/ARM.cpp b/clang/lib/Basic/Targets/ARM.cpp
index 55b71557452fa..877799c66ec4f 100644
--- a/clang/lib/Basic/Targets/ARM.cpp
+++ b/clang/lib/Basic/Targets/ARM.cpp
@@ -509,7 +509,7 @@ bool ARMTargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
   SHA2 = 0;
   AES = 0;
   DSP = 0;
-  Unaligned = 1;
+  HasUnalignedAccess = true;
   SoftFloat = false;
   // Note that SoftFloatABI is initialized in our constructor.
   HWDiv = 0;
@@ -576,7 +576,7 @@ bool ARMTargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
         return false;
       }
     } else if (Feature == "+strict-align") {
-      Unaligned = 0;
+      HasUnalignedAccess = false;
     } else if (Feature == "+fp16") {
       HW_FP |= HW_FP_HP;
     } else if (Feature == "+fullfp16") {
@@ -785,7 +785,7 @@ void ARMTargetInfo::getTargetDefines(const LangOptions &Opts,
     Builder.defineMacro("__ARM_ARCH_PROFILE", "'" + CPUProfile + "'");
 
   // ACLE 6.4.3 Unaligned access supported in hardware
-  if (Unaligned)
+  if (HasUnalignedAccess)
     Builder.defineMacro("__ARM_FEATURE_UNALIGNED", "1");
 
   // ACLE 6.4.4 LDREX/STREX
diff --git a/clang/lib/Basic/Targets/ARM.h b/clang/lib/Basic/Targets/ARM.h
index 71322a094f5ed..e69adbe754739 100644
--- a/clang/lib/Basic/Targets/ARM.h
+++ b/clang/lib/Basic/Targets/ARM.h
@@ -88,8 +88,6 @@ class LLVM_LIBRARY_VISIBILITY ARMTargetInfo : public TargetInfo {
   LLVM_PREFERRED_TYPE(bool)
   unsigned DSP : 1;
   LLVM_PREFERRED_TYPE(bool)
-  unsigned Unaligned : 1;
-  LLVM_PREFERRED_TYPE(bool)
   unsigned DotProd : 1;
   LLVM_PREFERRED_TYPE(bool)
   unsigned HasMatMul : 1;
diff --git a/clang/lib/Basic/Targets/LoongArch.cpp b/clang/lib/Basic/Targets/LoongArch.cpp
index 88537989a0512..280bd1d8033cc 100644
--- a/clang/lib/Basic/Targets/LoongArch.cpp
+++ b/clang/lib/Basic/Targets/LoongArch.cpp
@@ -285,6 +285,8 @@ bool LoongArchTargetInfo::handleTargetFeatures(
       HasFeatureLSX = true;
     else if (Feature == "+lasx")
       HasFeatureLASX = true;
+    else if (Feature == "-ual")
+      HasUnalignedAccess = false;
   }
   return true;
 }
diff --git a/clang/lib/Basic/Targets/LoongArch.h b/clang/lib/Basic/Targets/LoongArch.h
index 3313102492cb8..68572843f2d74 100644
--- a/clang/lib/Basic/Targets/LoongArch.h
+++ b/clang/lib/Basic/Targets/LoongArch.h
@@ -132,6 +132,7 @@ class LLVM_LIBRARY_VISIBILITY LoongArch64TargetInfo
       : LoongArchTargetInfo(Triple, Opts) {
     LongWidth = LongAlign = PointerWidth = PointerAlign = 64;
     IntMaxType = Int64Type = SignedLong;
+    HasUnalignedAccess = true;
     resetDataLayout("e-m:e-p:64:64-i64:64-i128:128-n64-S128");
     // TODO: select appropriate ABI.
     setABI("lp64d");
diff --git a/clang/lib/Basic/Targets/Mips.h b/clang/lib/Basic/Targets/Mips.h
index 23d4e1b598fa1..c9dcf434c93b0 100644
--- a/clang/lib/Basic/Targets/Mips.h
+++ b/clang/lib/Basic/Targets/Mips.h
@@ -328,6 +328,8 @@ class LLVM_LIBRARY_VISIBILITY MipsTargetInfo : public TargetInfo {
         IsMips16 = true;
       else if (Feature == "+micromips")
         IsMicromips = true;
+      else if (Feature == "+mips32r6" || Feature == "+mips64r6")
+        HasUnalignedAccess = true;
       else if (Feature == "+dsp")
         DspRev = std::max(DspRev, DSP1);
       else if (Feature == "+dspr2")
diff --git a/clang/lib/Basic/Targets/PPC.h b/clang/lib/Basic/Targets/PPC.h
index 70683916a8b04..fa2f442e25846 100644
--- a/clang/lib/Basic/Targets/PPC.h
+++ b/clang/lib/Basic/Targets/PPC.h
@@ -92,6 +92,7 @@ class LLVM_LIBRARY_VISIBILITY PPCTargetInfo : public TargetInfo {
     LongDoubleFormat = &llvm::APFloat::PPCDoubleDouble();
     HasStrictFP = true;
     HasIbm128 = true;
+    HasUnalignedAccess = true;
   }
 
   // Set the language option for altivec based on our value.
diff --git a/clang/lib/Basic/Targets/SystemZ.h b/clang/lib/Basic/Targets/SystemZ.h
index 3e08b27972fa3..8e302acd51b8a 100644
--- a/clang/lib/Basic/Targets/SystemZ.h
+++ b/clang/lib/Basic/Targets/SystemZ.h
@@ -47,6 +47,7 @@ class LLVM_LIBRARY_VISIBILITY SystemZTargetInfo : public TargetInfo {
     LongDoubleFormat = &llvm::APFloat::IEEEquad();
     DefaultAlignForAttributeAligned = 64;
     MinGlobalAlign = 16;
+    HasUnalignedAccess = true;
     if (Triple.isOSzOS()) {
       TLSSupported = false;
       // All vector types are default aligned on an 8-byte boundary, even if the
diff --git a/clang/lib/Basic/Targets/VE.h b/clang/lib/Basic/Targets/VE.h
index ea9a092cad809..7e8fdf6096ef2 100644
--- a/clang/lib/Basic/Targets/VE.h
+++ b/clang/lib/Basic/Targets/VE.h
@@ -40,6 +40,7 @@ class LLVM_LIBRARY_VISIBILITY VETargetInfo : public TargetInfo {
     Int64Type = SignedLong;
     RegParmMax = 8;
     MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 64;
+    HasUnalignedAccess = true;
 
     WCharType = UnsignedInt;
     WIntType = UnsignedInt;
diff --git a/clang/lib/Basic/Targets/WebAssembly.h b/clang/lib/Basic/Targets/WebAssembly.h
index 83b1711f9fdf6..5568aa28eaefa 100644
--- a/clang/lib/Basic/Targets/WebAssembly.h
+++ b/clang/lib/Basic/Targets/WebAssembly.h
@@ -84,6 +84,7 @@ class LLVM_LIBRARY_VISIBILITY WebAssemblyTargetInfo : public TargetInfo {
     SizeType = UnsignedLong;
     PtrDiffType = SignedLong;
     IntPtrType = SignedLong;
+    HasUnalignedAccess = true;
   }
 
   StringRef getABI() const override;
diff --git a/clang/lib/Basic/Targets/X86.h b/clang/lib/Basic/Targets/X86.h
index d2232c7d5275a..c14e4d5f433d8 100644
--- a/clang/lib/Basic/Targets/X86.h
+++ b/clang/lib/Basic/Targets/X86.h
@@ -188,6 +188,7 @@ class LLVM_LIBRARY_VISIBILITY X86TargetInfo : public TargetInfo {
     LongDoubleFormat = &llvm::APFloat::x87DoubleExtended();
     AddrSpaceMap = &X86AddrSpaceMap;
     HasStrictFP = true;
+    HasUnalignedAccess = true;
 
     bool IsWinCOFF =
         getTriple().isOSWindows() && getTriple().isOSBinFormatCOFF();