diff --git a/clang/lib/Basic/Targets/PPC.h b/clang/lib/Basic/Targets/PPC.h
--- a/clang/lib/Basic/Targets/PPC.h
+++ b/clang/lib/Basic/Targets/PPC.h
@@ -74,6 +74,7 @@
   bool HasP10Vector = false;
   bool HasPCRelativeMemops = false;
   bool HasPrefixInstrs = false;
+  bool IsISA2_06 = false;
   bool IsISA2_07 = false;
   bool IsISA3_0 = false;
   bool IsISA3_1 = false;
diff --git a/clang/lib/Basic/Targets/PPC.cpp b/clang/lib/Basic/Targets/PPC.cpp
--- a/clang/lib/Basic/Targets/PPC.cpp
+++ b/clang/lib/Basic/Targets/PPC.cpp
@@ -73,6 +73,8 @@
       HasROPProtect = true;
     } else if (Feature == "+privileged") {
       HasPrivileged = true;
+    } else if (Feature == "+isa-v206-instructions") {
+      IsISA2_06 = true;
     } else if (Feature == "+isa-v207-instructions") {
       IsISA2_07 = true;
     } else if (Feature == "+isa-v30-instructions") {
@@ -521,6 +523,13 @@
                         .Case("e500", true)
                         .Default(false);
 
+  Features["isa-v206-instructions"] = llvm::StringSwitch<bool>(CPU)
+                                          .Case("ppc64le", true)
+                                          .Case("pwr9", true)
+                                          .Case("pwr8", true)
+                                          .Case("pwr7", true)
+                                          .Default(false);
+
   Features["isa-v207-instructions"] = llvm::StringSwitch<bool>(CPU)
                                           .Case("ppc64le", true)
                                           .Case("pwr9", true)
@@ -617,6 +626,7 @@
       .Case("mma", HasMMA)
       .Case("rop-protect", HasROPProtect)
       .Case("privileged", HasPrivileged)
+      .Case("isa-v206-instructions", IsISA2_06)
       .Case("isa-v207-instructions", IsISA2_07)
       .Case("isa-v30-instructions", IsISA3_0)
       .Case("isa-v31-instructions", IsISA3_1)
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -3512,6 +3512,10 @@
                             diag::err_ppc_builtin_requires_vsx) ||
            SemaBuiltinConstantArgRange(TheCall, 1, 0, 127);
   }
+  case PPC::BI__builtin_ppc_load8r:
+  case PPC::BI__builtin_ppc_store8r:
+    return SemaFeatureCheck(*this, TheCall, "isa-v206-instructions",
+                            diag::err_ppc_builtin_only_on_arch, "7");
 #define CUSTOM_BUILTIN(Name, Intr, Types, Acc) \
   case PPC::BI__builtin_##Name: \
     return SemaBuiltinPPCMMACall(TheCall, Types);
diff --git a/clang/test/Driver/ppc-isa-features.cpp b/clang/test/Driver/ppc-isa-features.cpp
--- a/clang/test/Driver/ppc-isa-features.cpp
+++ b/clang/test/Driver/ppc-isa-features.cpp
@@ -1,8 +1,14 @@
+// RUN: %clang -target powerpc64-unknown-unknown -mcpu=pwr6 -S -emit-llvm %s -o - | FileCheck %s -check-prefix=CHECK-PWR6
 // RUN: %clang -target powerpc64-unknown-unknown -mcpu=pwr7 -S -emit-llvm %s -o - | FileCheck %s -check-prefix=CHECK-PWR7
 // RUN: %clang -target powerpc64le-unknown-unknown -mcpu=pwr8 -S -emit-llvm %s -o - | FileCheck %s -check-prefix=CHECK-PWR8
 // RUN: %clang -target powerpc64-unknown-aix -mcpu=pwr9 -S -emit-llvm %s -o - | FileCheck %s -check-prefix=CHECK-PWR9
 // RUN: %clang -target powerpc-unknown-aix -mcpu=pwr10 -S -emit-llvm %s -o - | FileCheck %s -check-prefix=CHECK-PWR10
 
+// CHECK-PWR6: -isa-v206-instructions
+// CHECK-PWR6: -isa-v207-instructions
+// CHECK-PWR6: -isa-v30-instructions
+
+// CHECK-PWR7: +isa-v206-instructions
 // CHECK-PWR7: -isa-v207-instructions
 // CHECK-PWR7: -isa-v30-instructions
 
diff --git a/llvm/lib/Target/PowerPC/PPC.td b/llvm/lib/Target/PowerPC/PPC.td
--- a/llvm/lib/Target/PowerPC/PPC.td
+++ b/llvm/lib/Target/PowerPC/PPC.td
@@ -213,6 +213,9 @@
 def DeprecatedDST    : SubtargetFeature<"", "DeprecatedDST", "true",
   "Treat vector data stream cache control instructions as deprecated">;
 
+def FeatureISA2_06 : SubtargetFeature<"isa-v206-instructions", "IsISA2_06",
+                                      "true",
+                                      "Enable instructions in ISA 2.06.">;
 def FeatureISA2_07 : SubtargetFeature<"isa-v207-instructions", "IsISA2_07",
                                       "true",
                                       "Enable instructions in ISA 2.07.">;
@@ -319,7 +322,8 @@
                                                   FeatureMFTB,
                                                   DeprecatedDST,
                                                   FeatureTwoConstNR,
-                                                  FeatureUnalignedFloats];
+                                                  FeatureUnalignedFloats,
+                                                  FeatureISA2_06];
   list<SubtargetFeature> P7SpecificFeatures = [];
   list<SubtargetFeature> P7Features =
     !listconcat(P7InheritableFeatures, P7SpecificFeatures);
diff --git a/llvm/lib/Target/PowerPC/PPCInstr64Bit.td b/llvm/lib/Target/PowerPC/PPCInstr64Bit.td
--- a/llvm/lib/Target/PowerPC/PPCInstr64Bit.td
+++ b/llvm/lib/Target/PowerPC/PPCInstr64Bit.td
@@ -1302,9 +1302,12 @@
 def LDX  : XForm_1_memOp<31,  21, (outs g8rc:$rD), (ins memrr:$src),
                         "ldx $rD, $src", IIC_LdStLD,
                         [(set i64:$rD, (load XForm:$src))]>, isPPC64;
+
+let Predicates = [IsISA2_06] in {
 def LDBRX : XForm_1_memOp<31,  532, (outs g8rc:$rD), (ins memrr:$src),
                           "ldbrx $rD, $src", IIC_LdStLoad,
                           [(set i64:$rD, (PPClbrx ForceXForm:$src, i64))]>, isPPC64;
+}
 
 let mayLoad = 1, hasSideEffects = 0, isCodeGenOnly = 1 in {
 def LHBRX8 : XForm_1_memOp<31, 790, (outs g8rc:$rD), (ins memrr:$src),
@@ -1538,10 +1541,13 @@
                           "stdx $rS, $dst", IIC_LdStSTD,
                           [(store i64:$rS, XForm:$dst)]>, isPPC64,
                           PPC970_DGroup_Cracked;
+
+let Predicates = [IsISA2_06] in {
 def STDBRX: XForm_8_memOp<31, 660, (outs), (ins g8rc:$rS, memrr:$dst),
                           "stdbrx $rS, $dst", IIC_LdStStore,
                           [(PPCstbrx i64:$rS, ForceXForm:$dst, i64)]>, isPPC64,
                           PPC970_DGroup_Cracked;
+}
 
 let mayStore = 1, hasNoSchedulingInfo = 1 in {
 // Normal 16-byte stores.
diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.td b/llvm/lib/Target/PowerPC/PPCInstrInfo.td
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.td
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.td
@@ -1182,6 +1182,7 @@
     : Predicate<"!Subtarget->getTargetMachine().Options.NoNaNsFPMath">;
 def HasBPERMD : Predicate<"Subtarget->hasBPERMD()">;
 def HasExtDiv : Predicate<"Subtarget->hasExtDiv()">;
+def IsISA2_06 : Predicate<"Subtarget->isISA2_06()">;
 def IsISA2_07 : Predicate<"Subtarget->isISA2_07()">;
 def IsISA3_0 : Predicate<"Subtarget->isISA3_0()">;
 def HasFPU : Predicate<"Subtarget->hasFPU()">;
diff --git a/llvm/lib/Target/PowerPC/PPCSubtarget.h b/llvm/lib/Target/PowerPC/PPCSubtarget.h
--- a/llvm/lib/Target/PowerPC/PPCSubtarget.h
+++ b/llvm/lib/Target/PowerPC/PPCSubtarget.h
@@ -147,6 +147,7 @@
   bool HasStoreFusion;
   bool HasAddiLoadFusion;
   bool HasAddisLoadFusion;
+  bool IsISA2_06;
   bool IsISA2_07;
   bool IsISA3_0;
   bool IsISA3_1;
@@ -322,6 +323,7 @@
 
   bool hasHTM() const { return HasHTM; }
   bool hasFloat128() const { return HasFloat128; }
+  bool isISA2_06() const { return IsISA2_06; }
   bool isISA2_07() const { return IsISA2_07; }
   bool isISA3_0() const { return IsISA3_0; }
   bool isISA3_1() const { return IsISA3_1; }
diff --git a/llvm/lib/Target/PowerPC/PPCSubtarget.cpp b/llvm/lib/Target/PowerPC/PPCSubtarget.cpp
--- a/llvm/lib/Target/PowerPC/PPCSubtarget.cpp
+++ b/llvm/lib/Target/PowerPC/PPCSubtarget.cpp
@@ -127,6 +127,7 @@
   HasStoreFusion = false;
   HasAddiLoadFusion = false;
   HasAddisLoadFusion = false;
+  IsISA2_06 = false;
   IsISA2_07 = false;
   IsISA3_0 = false;
   IsISA3_1 = false;