[clang] [clang][NFCI] Use TargetInfo to determine device kernel calling convention (PR #144728)

[Nick Sarnie via cfe-commits]

https://github.com/sarnex created https://github.com/llvm/llvm-project/pull/144728

None

>From da1523ec3b68d3d2a23f502df779c7e3f54320d0 Mon Sep 17 00:00:00 2001
From: "Sarnie, Nick" <nick.sarnie at intel.com>
Date: Wed, 18 Jun 2025 08:33:25 -0700
Subject: [PATCH] [clang][NFCI] Use TargetInfo to determine device kernel
 calling convention

Signed-off-by: Sarnie, Nick <nick.sarnie at intel.com>
---
 clang/lib/CodeGen/CGCall.cpp         | 13 ++-----------
 clang/lib/CodeGen/TargetInfo.cpp     |  8 ++++----
 clang/lib/CodeGen/TargetInfo.h       |  4 ++--
 clang/lib/CodeGen/Targets/AMDGPU.cpp |  4 ++--
 clang/lib/CodeGen/Targets/NVPTX.cpp  |  2 +-
 clang/lib/CodeGen/Targets/SPIR.cpp   |  4 ++--
 6 files changed, 13 insertions(+), 22 deletions(-)

diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
index a06455d25b1ef..fd75de42515da 100644
--- a/clang/lib/CodeGen/CGCall.cpp
+++ b/clang/lib/CodeGen/CGCall.cpp
@@ -83,17 +83,8 @@ unsigned CodeGenTypes::ClangCallConvToLLVMCallConv(CallingConv CC) {
     return llvm::CallingConv::AArch64_SVE_VectorCall;
   case CC_SpirFunction:
     return llvm::CallingConv::SPIR_FUNC;
-  case CC_DeviceKernel: {
-    if (CGM.getLangOpts().OpenCL)
-      return CGM.getTargetCodeGenInfo().getOpenCLKernelCallingConv();
-    if (CGM.getTriple().isSPIROrSPIRV())
-      return llvm::CallingConv::SPIR_KERNEL;
-    if (CGM.getTriple().isAMDGPU())
-      return llvm::CallingConv::AMDGPU_KERNEL;
-    if (CGM.getTriple().isNVPTX())
-      return llvm::CallingConv::PTX_Kernel;
-    llvm_unreachable("Unknown kernel calling convention");
-  }
+  case CC_DeviceKernel:
+    return CGM.getTargetCodeGenInfo().getDeviceKernelCallingConv();
   case CC_PreserveMost:
     return llvm::CallingConv::PreserveMost;
   case CC_PreserveAll:
diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
index f3df92c44bb6b..bc771c45951b3 100644
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -103,11 +103,11 @@ TargetCodeGenInfo::getDependentLibraryOption(llvm::StringRef Lib,
   Opt += Lib;
 }
 
-unsigned TargetCodeGenInfo::getOpenCLKernelCallingConv() const {
-  // OpenCL kernels are called via an explicit runtime API with arguments
-  // set with clSetKernelArg(), not as normal sub-functions.
+unsigned TargetCodeGenInfo::getDeviceKernelCallingConv() const {
+  // Device kernels are called via an explicit runtime API with arguments,
+  // such as set with clSetKernelArg() for OpenCL, not as normal sub-functions.
   // Return SPIR_KERNEL by default as the kernel calling convention to
-  // ensure the fingerprint is fixed such way that each OpenCL argument
+  // ensure the fingerprint is fixed such way that each kernel argument
   // gets one matching argument in the produced kernel function argument
   // list to enable feasible implementation of clSetKernelArg() with
   // aggregates etc. In case we would use the default C calling conv here,
diff --git a/clang/lib/CodeGen/TargetInfo.h b/clang/lib/CodeGen/TargetInfo.h
index 2783e222eb802..b4057d369f988 100644
--- a/clang/lib/CodeGen/TargetInfo.h
+++ b/clang/lib/CodeGen/TargetInfo.h
@@ -298,8 +298,8 @@ class TargetCodeGenInfo {
                                        llvm::StringRef Value,
                                        llvm::SmallString<32> &Opt) const {}
 
-  /// Get LLVM calling convention for OpenCL kernel.
-  virtual unsigned getOpenCLKernelCallingConv() const;
+  /// Get LLVM calling convention for device kernels.
+  virtual unsigned getDeviceKernelCallingConv() const;
 
   /// Get target specific null pointer.
   /// \param T is the LLVM type of the null pointer.
diff --git a/clang/lib/CodeGen/Targets/AMDGPU.cpp b/clang/lib/CodeGen/Targets/AMDGPU.cpp
index 8660373c3927f..47a552a7bf495 100644
--- a/clang/lib/CodeGen/Targets/AMDGPU.cpp
+++ b/clang/lib/CodeGen/Targets/AMDGPU.cpp
@@ -304,7 +304,7 @@ class AMDGPUTargetCodeGenInfo : public TargetCodeGenInfo {
 
   void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
                            CodeGen::CodeGenModule &M) const override;
-  unsigned getOpenCLKernelCallingConv() const override;
+  unsigned getDeviceKernelCallingConv() const override;
 
   llvm::Constant *getNullPointer(const CodeGen::CodeGenModule &CGM,
       llvm::PointerType *T, QualType QT) const override;
@@ -431,7 +431,7 @@ void AMDGPUTargetCodeGenInfo::setTargetAttributes(
     F->addFnAttr("amdgpu-ieee", "false");
 }
 
-unsigned AMDGPUTargetCodeGenInfo::getOpenCLKernelCallingConv() const {
+unsigned AMDGPUTargetCodeGenInfo::getDeviceKernelCallingConv() const {
   return llvm::CallingConv::AMDGPU_KERNEL;
 }
 
diff --git a/clang/lib/CodeGen/Targets/NVPTX.cpp b/clang/lib/CodeGen/Targets/NVPTX.cpp
index ad802c9131de0..82bdfe2666b52 100644
--- a/clang/lib/CodeGen/Targets/NVPTX.cpp
+++ b/clang/lib/CodeGen/Targets/NVPTX.cpp
@@ -78,7 +78,7 @@ class NVPTXTargetCodeGenInfo : public TargetCodeGenInfo {
     return true;
   }
 
-  unsigned getOpenCLKernelCallingConv() const override {
+  unsigned getDeviceKernelCallingConv() const override {
     return llvm::CallingConv::PTX_Kernel;
   }
 
diff --git a/clang/lib/CodeGen/Targets/SPIR.cpp b/clang/lib/CodeGen/Targets/SPIR.cpp
index 2f1e43cdc8cc3..afa23bffcd073 100644
--- a/clang/lib/CodeGen/Targets/SPIR.cpp
+++ b/clang/lib/CodeGen/Targets/SPIR.cpp
@@ -51,7 +51,7 @@ class CommonSPIRTargetCodeGenInfo : public TargetCodeGenInfo {
         getABIInfo().getDataLayout().getAllocaAddrSpace());
   }
 
-  unsigned getOpenCLKernelCallingConv() const override;
+  unsigned getDeviceKernelCallingConv() const override;
   llvm::Type *getOpenCLType(CodeGenModule &CGM, const Type *T) const override;
   llvm::Type *
   getHLSLType(CodeGenModule &CGM, const Type *Ty,
@@ -219,7 +219,7 @@ void computeSPIRKernelABIInfo(CodeGenModule &CGM, CGFunctionInfo &FI) {
 }
 }
 
-unsigned CommonSPIRTargetCodeGenInfo::getOpenCLKernelCallingConv() const {
+unsigned CommonSPIRTargetCodeGenInfo::getDeviceKernelCallingConv() const {
   return llvm::CallingConv::SPIR_KERNEL;
 }