diff --git a/docs/DXIL.rst b/docs/DXIL.rst
index 510bb4951..86c1b83dd 100644
--- a/docs/DXIL.rst
+++ b/docs/DXIL.rst
@@ -3192,7 +3192,7 @@ SM.WAVESIZENEEDSDXIL16PLUS                WaveSize is valid only for DXIL versio
 SM.WAVESIZEVALUE                          Declared WaveSize %0 outside valid range [%1..%2], or not a power of 2.
 SM.ZEROHSINPUTCONTROLPOINTWITHINPUT       When HS input control point count is 0, no input signature should exist.
 TYPES.DEFINED                             Type must be defined based on DXIL primitives
-TYPES.I8                                  I8 can only be used as immediate value for intrinsic.
+TYPES.I8                                  I8 can only be used as immediate value for intrinsic or as i8* via bitcast by lifetime intrinsics.
 TYPES.INTWIDTH                            Int type must be of valid width
 TYPES.NOMULTIDIM                          Only one dimension allowed for array type.
 TYPES.NOPTRTOPTR                          Pointers to pointers, or pointers in structures are not allowed.
diff --git a/include/dxc/HLSL/DxilValidation.h b/include/dxc/HLSL/DxilValidation.h
index 478d004be..01a92e489 100644
--- a/include/dxc/HLSL/DxilValidation.h
+++ b/include/dxc/HLSL/DxilValidation.h
@@ -271,7 +271,7 @@ enum class ValidationRule : unsigned {
 
   // Type system
   TypesDefined, // Type must be defined based on DXIL primitives
-  TypesI8, // I8 can only be used as immediate value for intrinsic.
+  TypesI8, // I8 can only be used as immediate value for intrinsic or as i8* via bitcast by lifetime intrinsics.
   TypesIntWidth, // Int type must be of valid width
   TypesNoMultiDim, // Only one dimension allowed for array type.
   TypesNoPtrToPtr, // Pointers to pointers, or pointers in structures are not allowed.
diff --git a/include/dxc/HlslIntrinsicOp.h b/include/dxc/HlslIntrinsicOp.h
index 96ae86e7f..6f76c7c5f 100644
--- a/include/dxc/HlslIntrinsicOp.h
+++ b/include/dxc/HlslIntrinsicOp.h
@@ -230,13 +230,13 @@ import hctdb_instrhelp
   IOP_texCUBEproj,
   IOP_transpose,
   IOP_trunc,
-#ifdef ENABLE_SPIRV_CODEGEN
-  IOP_VkReadClock,
-#endif // ENABLE_SPIRV_CODEGEN
   IOP_unpack_s8s16,
   IOP_unpack_s8s32,
   IOP_unpack_u8u16,
   IOP_unpack_u8u32,
+#ifdef ENABLE_SPIRV_CODEGEN
+  IOP_VkReadClock,
+#endif // ENABLE_SPIRV_CODEGEN
   MOP_Append,
   MOP_RestartStrip,
   MOP_CalculateLevelOfDetail,
diff --git a/lib/HLSL/HLOperationLower.cpp b/lib/HLSL/HLOperationLower.cpp
index 8883cb394..39007fbc2 100644
--- a/lib/HLSL/HLOperationLower.cpp
+++ b/lib/HLSL/HLOperationLower.cpp
@@ -5511,13 +5511,13 @@ IntrinsicLower gLowerTable[] = {
     {IntrinsicOp::IOP_texCUBEproj, EmptyLower, DXIL::OpCode::NumOpCodes},
     {IntrinsicOp::IOP_transpose, EmptyLower, DXIL::OpCode::NumOpCodes},
     {IntrinsicOp::IOP_trunc, TrivialUnaryOperation, DXIL::OpCode::Round_z},
-    #ifdef ENABLE_SPIRV_CODEGEN
-    {IntrinsicOp::IOP_VkReadClock, UnsupportedVulkanIntrinsic, DXIL::OpCode::NumOpCodes},
-#endif // ENABLE_SPIRV_CODEGEN
     {IntrinsicOp::IOP_unpack_s8s16, TranslateUnpack, DXIL::OpCode::Unpack4x8},
     {IntrinsicOp::IOP_unpack_s8s32, TranslateUnpack, DXIL::OpCode::Unpack4x8},
     {IntrinsicOp::IOP_unpack_u8u16, TranslateUnpack, DXIL::OpCode::Unpack4x8},
     {IntrinsicOp::IOP_unpack_u8u32, TranslateUnpack, DXIL::OpCode::Unpack4x8},
+#ifdef ENABLE_SPIRV_CODEGEN
+    { IntrinsicOp::IOP_VkReadClock, UnsupportedVulkanIntrinsic, DXIL::OpCode::NumOpCodes },
+#endif // ENABLE_SPIRV_CODEGEN
     {IntrinsicOp::MOP_Append, StreamOutputLower, DXIL::OpCode::EmitStream},
     {IntrinsicOp::MOP_RestartStrip, StreamOutputLower, DXIL::OpCode::CutStream},
     {IntrinsicOp::MOP_CalculateLevelOfDetail, TranslateCalculateLOD, DXIL::OpCode::NumOpCodes},
diff --git a/utils/hct/hctdb.py b/utils/hct/hctdb.py
index a9afeabe0..be2a18e14 100644
--- a/utils/hct/hctdb.py
+++ b/utils/hct/hctdb.py
@@ -2561,7 +2561,7 @@ class db_dxil(object):
         self.add_valrule_msg("Types.IntWidth", "Int type must be of valid width", "Int type '%0' has an invalid width.")
         self.add_valrule("Types.NoMultiDim", "Only one dimension allowed for array type.")
         self.add_valrule("Types.NoPtrToPtr", "Pointers to pointers, or pointers in structures are not allowed.")
-        self.add_valrule("Types.I8", "I8 can only be used as immediate value for intrinsic.")
+        self.add_valrule("Types.I8", "I8 can only be used as immediate value for intrinsic or as i8* via bitcast by lifetime intrinsics.")
 
         self.add_valrule_msg("Sm.Name", "Target shader model name must be known", "Unknown shader model '%0'.")
         self.add_valrule_msg("Sm.DxilVersion", "Target shader model requires specific Dxil Version", "Shader model requires Dxil Version %0,%1.")