[libc] Remove leftover 'gpu/' source directory

[jhuber6]

Summary:
This isn't used anymore, I moved the GPU extensions into offload/.

[llvmbot]

@llvm/pr-subscribers-libc

Author: Joseph Huber (jhuber6)

Changes

Summary:
This isn't used anymore, I moved the GPU extensions into offload/.

---

Full diff: https://github.com/llvm/llvm-project/pull/122368.diff

4 Files Affected:

• (modified) libc/src/CMakeLists.txt (-4)
• (removed) libc/src/gpu/CMakeLists.txt (-10)
• (removed) libc/src/gpu/rpc_host_call.cpp (-35)
• (removed) libc/src/gpu/rpc_host_call.h (-21)

diff --git a/libc/src/CMakeLists.txt b/libc/src/CMakeLists.txt
index 9fc331ad18a391..32308ba147940c 100644
--- a/libc/src/CMakeLists.txt
+++ b/libc/src/CMakeLists.txt
@@ -26,10 +26,6 @@ if(${LIBC_TARGET_OS} STREQUAL "linux")
   add_subdirectory(unistd)
 endif()
 
-if(${LIBC_TARGET_OS} STREQUAL "gpu")
-  add_subdirectory(gpu)
-endif()
-
 if(NOT LLVM_LIBC_FULL_BUILD)
   return()
 endif()
diff --git a/libc/src/gpu/CMakeLists.txt b/libc/src/gpu/CMakeLists.txt
deleted file mode 100644
index e20228516b5112..00000000000000
--- a/libc/src/gpu/CMakeLists.txt
+++ /dev/null
@@ -1,10 +0,0 @@
-add_entrypoint_object(
-  rpc_host_call
-  SRCS
-    rpc_host_call.cpp
-  HDRS
-    rpc_host_call.h
-  DEPENDS
-    libc.src.__support.RPC.rpc_client
-    libc.src.__support.GPU.utils
-)
diff --git a/libc/src/gpu/rpc_host_call.cpp b/libc/src/gpu/rpc_host_call.cpp
deleted file mode 100644
index 676031d16e1540..00000000000000
--- a/libc/src/gpu/rpc_host_call.cpp
+++ /dev/null
@@ -1,35 +0,0 @@
-//===---------- GPU implementation of the external RPC call function ------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#include "src/gpu/rpc_host_call.h"
-
-#include "src/__support/GPU/utils.h"
-#include "src/__support/RPC/rpc_client.h"
-#include "src/__support/common.h"
-#include "src/__support/macros/config.h"
-
-namespace LIBC_NAMESPACE_DECL {
-
-// This calls the associated function pointer on the RPC server with the given
-// arguments. We expect that the pointer here is a valid pointer on the server.
-LLVM_LIBC_FUNCTION(unsigned long long, rpc_host_call,
-                   (void *fn, void *data, size_t size)) {
-  rpc::Client::Port port = rpc::client.open<LIBC_HOST_CALL>();
-  port.send_n(data, size);
-  port.send([=](rpc::Buffer *buffer, uint32_t) {
-    buffer->data[0] = reinterpret_cast<uintptr_t>(fn);
-  });
-  unsigned long long ret;
-  port.recv([&](rpc::Buffer *buffer, uint32_t) {
-    ret = static_cast<unsigned long long>(buffer->data[0]);
-  });
-  port.close();
-  return ret;
-}
-
-} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/gpu/rpc_host_call.h b/libc/src/gpu/rpc_host_call.h
deleted file mode 100644
index 861149dead561e..00000000000000
--- a/libc/src/gpu/rpc_host_call.h
+++ /dev/null
@@ -1,21 +0,0 @@
-//===-- Implementation header for RPC functions -----------------*- C++ -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_LIBC_SRC_GPU_RPC_HOST_CALL_H
-#define LLVM_LIBC_SRC_GPU_RPC_HOST_CALL_H
-
-#include "src/__support/macros/config.h"
-#include <stddef.h> // size_t
-
-namespace LIBC_NAMESPACE_DECL {
-
-unsigned long long rpc_host_call(void *fn, void *buffer, size_t size);
-
-} // namespace LIBC_NAMESPACE_DECL
-
-#endif // LLVM_LIBC_SRC_GPU_RPC_HOST_CALL_H