Offload host2

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -665,6 +665,59 @@ pub(crate) unsafe fn llvm_optimize(
 
     let llvm_plugins = config.llvm_plugins.join(",");
 
+    fn adjust_offload_kernel_abis(m: &llvm::Module, llcx: &llvm::Context) {
+        unsafe {
+        // We just add a `ptr %dyn_ptr, ` as the first arg to every kernel_{i} function.
+        // for function in function 
+        for num in 0..9 { 
+            let name = format!("kernel_{num}");
+            let c_name = CString::new(name).unwrap();
+            let kernel = llvm::LLVMGetNamedFunction(m,   c_name.as_ptr());
+            if let Some(old_fn) = kernel {
+                dbg!("found kernel");
+                //let old_fn_ty = llvm::LLVMTypeOf(old_fn);
+                //let ptr_ty = llvm::LLVMPointerTypeInContext(llcx, 0);
+                //
+                //let n = unsafe { llvm::LLVMCountParamTypes(old_fn_ty) } as usize;
+                //
+                //let mut old_param_tys = Vec::with_capacity(n);
+                //unsafe { llvm::LLVMGetParamTypes(old_fn_ty, old_param_tys.as_mut_ptr()) };
+                //let ret_ty = unsafe { llvm::LLVMGetReturnType(old_fn_ty) };// new param list = [ptr] + old params
+                //let mut new_params = Vec::with_capacity(n + 1);
+                //new_params.push(ptr_ty);
+                //for elem in &old_param_tys {
+                //    new_params.push(elem);
+                //}
+                //let new_fn_ty = unsafe {
+                //    llvm::LLVMFunctionType(ret_ty, new_params.as_mut_ptr(), new_params.len() as u32, llvm::False)
+                //};
+                //let new_fn = unsafe { llvm::LLVMAddFunction(c_name.as_ptr(), new_fn_ty) };
+                //let a0 = unsafe { llvm::LLVMGetParam(new_fn, 0) };
+                //unsafe { llvm::LLVMSetValueName2(a0, b"dyn_ptr\0".as_ptr(), "dyn_ptr".len()) };// Move basic blocks
+                //let mut bb = unsafe { llvm::LLVMGetFirstBasicBlock(old_fn) };
+                //while !bb.is_null() {
+                //    let next = unsafe { llvm::LLVMGetNextBasicBlock(bb) };
+                //    unsafe { llvm::LLVMAppendExistingBasicBlock(new_fn, bb) };
+                //    bb = next;
+                //}// Shift argument uses: old %0 -> new %1, old %1 -> new %2, ...
+                //let old_n = unsafe { llvm::LLVMCountParams(old_fn) };
+                //for i in 0..old_n {
+                //    let old_arg = unsafe { llvm::LLVMGetParam(old_fn, i) };
+                //    let new_arg = unsafe { llvm::LLVMGetParam(new_fn, i + 1) };
+                //    unsafe { llvm::LLVMReplaceAllUsesWith(old_arg, new_arg) };
+                //}
+                //unsafe { llvm::LLVMReplaceAllUsesWith(old_fn, new_fn) };
+            }
+        }
+        }
+
+    }
+    if cgcx.target_arch == "amdgpu" {
+        adjust_offload_kernel_abis(module.module_llvm.llmod(), &*module.module_llvm.llc);
+    } else {
+        dbg!(&cgcx.target_arch);
+    }
+
     let result = unsafe {
         llvm::LLVMRustOptimize(
             module.module_llvm.llmod(),