[clang] [CIR] Add calling convention values to CIR_CallingConv (PR #188715)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang

@llvm/pr-subscribers-clangir

Author: Rana Pratap Reddy (ranapratap55)

<details>
<summary>Changes</summary>

Populates the `CIR_CallingConv` enum with calling convention values: `C`, `SpirKernel`, `SpirFunction`, `OpenCLKernel`, `PTXKernel`, and `AMDGPUKernel`.

This is a partial upstreaming of [clangir#<!-- -->760](https://github.com/llvm/clangir/pull/760/).

Follow-up PRs:

1. Add `calling_conv` attribute to `FuncOp`
2. Add LLVM lowering support for calling conventions

Tests will be added in follow-up PRs.

---
Full diff: https://github.com/llvm/llvm-project/pull/188715.diff


1 Files Affected:

- (modified) clang/include/clang/CIR/Dialect/IR/CIROps.td (+8-3) 


``````````diff
diff --git a/clang/include/clang/CIR/Dialect/IR/CIROps.td b/clang/include/clang/CIR/Dialect/IR/CIROps.td
index b15dc30ffb87d..0f3d2c10cf678 100644
--- a/clang/include/clang/CIR/Dialect/IR/CIROps.td
+++ b/clang/include/clang/CIR/Dialect/IR/CIROps.td
@@ -3586,9 +3586,14 @@ def CIR_OptionalPriorityAttr : OptionalAttr<
   >
 >;
 
-// TODO(CIR): CallingConv is a placeholder here so we can use it in
-// infrastructure calls, but it currently has no values.
-def CIR_CallingConv : CIR_I32EnumAttr<"CallingConv", "calling convention", []>;
+def CIR_CallingConv : CIR_I32EnumAttr<"CallingConv", "calling convention", [
+  I32EnumAttrCase<"C", 1, "c">,
+  I32EnumAttrCase<"SpirKernel", 2, "spir_kernel">,
+  I32EnumAttrCase<"SpirFunction", 3, "spir_function">,
+  I32EnumAttrCase<"OpenCLKernel", 4, "opencl_kernel">,
+  I32EnumAttrCase<"PTXKernel", 5, "ptx_kernel">,
+  I32EnumAttrCase<"AMDGPUKernel", 6, "amdgpu_kernel">
+]>;
 
 def CIR_FuncOp : CIR_Op<"func", [
   AutomaticAllocationScope, CallableOpInterface, FunctionOpInterface,

``````````

</details>


https://github.com/llvm/llvm-project/pull/188715