Index: llvm/trunk/include/llvm/Support/AArch64TargetParser.h
===================================================================
--- llvm/trunk/include/llvm/Support/AArch64TargetParser.h
+++ llvm/trunk/include/llvm/Support/AArch64TargetParser.h
@@ -49,6 +49,7 @@
   AEK_MTE =         1 << 19,
   AEK_SSBS =        1 << 20,
   AEK_SB =          1 << 21,
+  AEK_PREDRES =     1 << 22,
 };
 
 enum class ArchKind {
Index: llvm/trunk/include/llvm/Support/AArch64TargetParser.def
===================================================================
--- llvm/trunk/include/llvm/Support/AArch64TargetParser.def
+++ llvm/trunk/include/llvm/Support/AArch64TargetParser.def
@@ -74,6 +74,7 @@
 AARCH64_ARCH_EXT_NAME("memtag",   AArch64::AEK_MTE,      "+mte",   "-mte")
 AARCH64_ARCH_EXT_NAME("ssbs",     AArch64::AEK_SSBS,     "+ssbs",  "-ssbs")
 AARCH64_ARCH_EXT_NAME("sb",       AArch64::AEK_SB,       "+sb",    "-sb")
+AARCH64_ARCH_EXT_NAME("predres",  AArch64::AEK_PREDRES,  "+predres", "-predres")
 #undef AARCH64_ARCH_EXT_NAME
 
 #ifndef AARCH64_CPU_NAME
Index: llvm/trunk/unittests/Support/TargetParserTest.cpp
===================================================================
--- llvm/trunk/unittests/Support/TargetParserTest.cpp
+++ llvm/trunk/unittests/Support/TargetParserTest.cpp
@@ -990,7 +990,9 @@
                               {"rng", "norng", "+rand", "-rand"},
                               {"memtag", "nomemtag", "+mte", "-mte"},
                               {"ssbs", "nossbs", "+ssbs", "-ssbs"},
-                              {"sb", "nosb", "+sb", "-sb"}};
+                              {"sb", "nosb", "+sb", "-sb"},
+                              {"predres", "nopredres", "+predres", "-predres"}
+};
 
   for (unsigned i = 0; i < array_lengthof(ArchExt); i++) {
     EXPECT_EQ(StringRef(ArchExt[i][2]),