[HLSL][SPIR-V] Add create.handle intrinsic (#81038)

Add a SPIR-V target-specific intrinsic for creating handles, which is
used for lowering HLSL resources types like RWBuffer.

`llvm/lib/TargetParser/Triple.cpp`: SPIR-V intrinsics use "spv" as the
target prefix, not "spirv". As far as I can tell, this is the first one
that is used via the `CGBuiltin` codepath, which relies on
`getArchTypePrefix`, so I've corrected it here.

`clang/lib/Basic/Targets/SPIR.h`: When records are laid out in the
lowering from AST to IR, they were incorrectly offset because these
Pointer attributes were defaulting to 32.

Related to #81036

clang/lib/Basic/Targets/SPIR.h

@@ -310,6 +310,7 @@ class LLVM_LIBRARY_VISIBILITY SPIRVTargetInfo : public BaseSPIRVTargetInfo {
     assert(Triple.getEnvironment() >= llvm::Triple::Pixel &&
            Triple.getEnvironment() <= llvm::Triple::Amplification &&
            "Logical SPIR-V environment must be a valid shader stage.");
+    PointerWidth = PointerAlign = 64;
 
     // SPIR-V IDs are represented with a single 32-bit word.
     SizeType = TargetInfo::UnsignedInt;

clang/test/CodeGenHLSL/builtins/RWBuffer-constructor.hlsl

@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-library -x hlsl -emit-llvm -disable-llvm-passes -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple spirv-vulkan-library -x hlsl -emit-llvm -disable-llvm-passes -o - %s | FileCheck %s --check-prefix=CHECK-SPIRV
 
 RWBuffer<float> Buf;
 
@@ -7,3 +8,6 @@ RWBuffer<float> Buf;
 
 // CHECK: %[[HandleRes:[0-9]+]] = call ptr @llvm.dx.create.handle(i8 1)
 // CHECK: store ptr %[[HandleRes]], ptr %h, align 4
+
+// CHECK-SPIRV: %[[HandleRes:[0-9]+]] = call ptr @llvm.spv.create.handle(i8 1)
+// CHECK-SPIRV: store ptr %[[HandleRes]], ptr %h, align 8

llvm/include/llvm/IR/IntrinsicsSPIRV.td

@@ -38,4 +38,8 @@ let TargetPrefix = "spv" in {
   // Expect, Assume Intrinsics
   def int_spv_assume : Intrinsic<[], [llvm_i1_ty]>;
   def int_spv_expect : Intrinsic<[llvm_anyint_ty], [LLVMMatchType<0>, LLVMMatchType<0>]>;
+
+  // The following intrinsic(s) are mirrored from IntrinsicsDirectX.td for HLSL support.
+  def int_spv_create_handle : ClangBuiltin<"__builtin_hlsl_create_handle">,
+      Intrinsic<[ llvm_ptr_ty ], [llvm_i8_ty], [IntrWillReturn]>;
 }

llvm/lib/IR/Function.cpp

@@ -44,6 +44,7 @@
 #include "llvm/IR/IntrinsicsR600.h"
 #include "llvm/IR/IntrinsicsRISCV.h"
 #include "llvm/IR/IntrinsicsS390.h"
+#include "llvm/IR/IntrinsicsSPIRV.h"
 #include "llvm/IR/IntrinsicsVE.h"
 #include "llvm/IR/IntrinsicsWebAssembly.h"
 #include "llvm/IR/IntrinsicsX86.h"

llvm/lib/TargetParser/Triple.cpp

@@ -188,7 +188,7 @@ StringRef Triple::getArchTypePrefix(ArchType Kind) {
 
   case spirv:
   case spirv32:
-  case spirv64:     return "spirv";
+  case spirv64:     return "spv";
 
   case kalimba:     return "kalimba";
   case lanai:       return "lanai";