diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -200,6 +200,8 @@
   implies -mtune=<cpu>. -mtune=generic is the default with no -march or -mtune
   specified.
 
+- Support for ISA HRESET has been added.
+
 Internal API Changes
 --------------------
 
diff --git a/clang/test/Preprocessor/predefined-arch-macros.c b/clang/test/Preprocessor/predefined-arch-macros.c
--- a/clang/test/Preprocessor/predefined-arch-macros.c
+++ b/clang/test/Preprocessor/predefined-arch-macros.c
@@ -1664,6 +1664,7 @@
 // CHECK_SPR_M32: #define __F16C__ 1
 // CHECK_SPR_M32: #define __FMA__ 1
 // CHECK_SPR_M32: #define __GFNI__ 1
+// CHECK_SPR_M32: #define __HRESET__ 1
 // CHECK_SPR_M32: #define __INVPCID__ 1
 // CHECK_SPR_M32: #define __LZCNT__ 1
 // CHECK_SPR_M32: #define __MMX__ 1
@@ -1733,6 +1734,7 @@
 // CHECK_SPR_M64: #define __F16C__ 1
 // CHECK_SPR_M64: #define __FMA__ 1
 // CHECK_SPR_M64: #define __GFNI__ 1
+// CHECK_SPR_M64: #define __HRESET__ 1
 // CHECK_SPR_M64: #define __INVPCID__ 1
 // CHECK_SPR_M64: #define __LZCNT__ 1
 // CHECK_SPR_M64: #define __MMX__ 1
diff --git a/llvm/lib/Support/X86TargetParser.cpp b/llvm/lib/Support/X86TargetParser.cpp
--- a/llvm/lib/Support/X86TargetParser.cpp
+++ b/llvm/lib/Support/X86TargetParser.cpp
@@ -204,7 +204,8 @@
     FeaturesICLServer | FeatureAMX_TILE | FeatureAMX_INT8 | FeatureAMX_BF16 |
     FeatureAVX512BF16 | FeatureAVX512VP2INTERSECT | FeatureCLDEMOTE |
     FeatureENQCMD | FeatureMOVDIR64B | FeatureMOVDIRI | FeaturePTWRITE |
-    FeatureSERIALIZE | FeatureSHSTK | FeatureTSXLDTRK | FeatureWAITPKG;
+    FeatureSERIALIZE | FeatureSHSTK | FeatureTSXLDTRK | FeatureWAITPKG |
+    FeatureHRESET;
 
 // Intel Atom processors.
 // Bonnell has feature parity with Core2 and adds MOVBE.
diff --git a/llvm/lib/Target/X86/X86.td b/llvm/lib/Target/X86/X86.td
--- a/llvm/lib/Target/X86/X86.td
+++ b/llvm/lib/Target/X86/X86.td
@@ -767,6 +767,7 @@
                                                   FeatureCLDEMOTE,
                                                   FeatureWAITPKG,
                                                   FeaturePTWRITE,
+                                                  FeatureHRESET,
                                                   FeatureTSXLDTRK,
                                                   FeatureENQCMD,
                                                   FeatureSHSTK,