Core: Drop custom `copymem`/`zeromem` defines

We've been using standard C library functions `memcpy`/`memset` for these since
2016 with 67f65f66391327b2967a20a89c3627e1dd6e84eb.

There was still the possibility for third-party platform ports to override the
definitions with a custom header, but this doesn't seem useful anymore.

27 files changed, 47 insertions, 113 deletions

diff --git a/core/input/input_event.h b/core/input/input_event.h
index a1e7df5969..94aa68db33 100644
--- a/core/input/input_event.h
+++ b/core/input/input_event.h
@@ -33,7 +33,6 @@
 
 #include "core/io/resource.h"
 #include "core/math/transform_2d.h"
-#include "core/os/copymem.h"
 #include "core/string/ustring.h"
 #include "core/typedefs.h"
 
diff --git a/core/io/compression.cpp b/core/io/compression.cpp
index 980234cbfc..6de626db99 100644
--- a/core/io/compression.cpp
+++ b/core/io/compression.cpp
@@ -32,7 +32,6 @@
 
 #include "core/config/project_settings.h"
 #include "core/io/zip_io.h"
-#include "core/os/copymem.h"
 
 #include "thirdparty/misc/fastlz.h"
 
@@ -44,8 +43,8 @@ int Compression::compress(uint8_t *p_dst, const uint8_t *p_src, int p_src_size,
 		case MODE_FASTLZ: {
 			if (p_src_size < 16) {
 				uint8_t src[16];
-				zeromem(&src[p_src_size], 16 - p_src_size);
-				copymem(src, p_src, p_src_size);
+				memset(&src[p_src_size], 0, 16 - p_src_size);
+				memcpy(src, p_src, p_src_size);
 				return fastlz_compress(src, 16, p_dst);
 			} else {
 				return fastlz_compress(p_src, p_src_size, p_dst);
@@ -136,7 +135,7 @@ int Compression::decompress(uint8_t *p_dst, int p_dst_max_size, const uint8_t *p
 			if (p_dst_max_size < 16) {
 				uint8_t dst[16];
 				ret_size = fastlz_decompress(p_src, p_src_size, dst, 16);
-				copymem(p_dst, dst, p_dst_max_size);
+				memcpy(p_dst, dst, p_dst_max_size);
 			} else {
 				ret_size = fastlz_decompress(p_src, p_src_size, p_dst, p_dst_max_size);
 			}
diff --git a/core/io/file_access_encrypted.cpp b/core/io/file_access_encrypted.cpp
index 8ace897f18..13377a3a25 100644
--- a/core/io/file_access_encrypted.cpp
+++ b/core/io/file_access_encrypted.cpp
@@ -31,7 +31,6 @@
 #include "file_access_encrypted.h"
 
 #include "core/crypto/crypto_core.h"
-#include "core/os/copymem.h"
 #include "core/string/print_string.h"
 #include "core/variant/variant.h"
 
@@ -151,7 +150,7 @@ void FileAccessEncrypted::_release() {
 		ERR_FAIL_COND(CryptoCore::md5(data.ptr(), data.size(), hash) != OK); // Bug?
 
 		compressed.resize(len);
-		zeromem(compressed.ptrw(), len);
+		memset(compressed.ptrw(), 0, len);
 		for (int i = 0; i < data.size(); i++) {
 			compressed.write[i] = data[i];
 		}
diff --git a/core/io/file_access_memory.cpp b/core/io/file_access_memory.cpp
index 58670d5246..af155a77a8 100644
--- a/core/io/file_access_memory.cpp
+++ b/core/io/file_access_memory.cpp
@@ -31,7 +31,6 @@
 #include "file_access_memory.h"
 
 #include "core/config/project_settings.h"
-#include "core/os/copymem.h"
 #include "core/os/dir_access.h"
 #include "core/templates/map.h"
 
@@ -149,7 +148,7 @@ int FileAccessMemory::get_buffer(uint8_t *p_dst, int p_length) const {
 		WARN_PRINT("Reading less data than requested");
 	}
 
-	copymem(p_dst, &data[pos], read);
+	memcpy(p_dst, &data[pos], read);
 	pos += p_length;
 
 	return read;
@@ -176,6 +175,6 @@ void FileAccessMemory::store_buffer(const uint8_t *p_src, int p_length) {
 		WARN_PRINT("Writing less data than requested");
 	}
 
-	copymem(&data[pos], p_src, write);
+	memcpy(&data[pos], p_src, write);
 	pos += p_length;
 }
diff --git a/core/io/file_access_zip.cpp b/core/io/file_access_zip.cpp
index 586c988974..397b577612 100644
--- a/core/io/file_access_zip.cpp
+++ b/core/io/file_access_zip.cpp
@@ -32,7 +32,6 @@
 
 #include "file_access_zip.h"
 
-#include "core/os/copymem.h"
 #include "core/os/file_access.h"
 
 ZipArchive *ZipArchive::instance = nullptr;
@@ -120,7 +119,7 @@ unzFile ZipArchive::get_file_handle(String p_file) const {
 	ERR_FAIL_COND_V_MSG(!f, nullptr, "Cannot open file '" + packages[file.package].filename + "'.");
 
 	zlib_filefunc_def io;
-	zeromem(&io, sizeof(io));
+	memset(&io, 0, sizeof(io));
 
 	io.opaque = f;
 	io.zopen_file = godot_open;
diff --git a/core/io/http_client.cpp b/core/io/http_client.cpp
index 3863dce0f6..4b053d576c 100644
--- a/core/io/http_client.cpp
+++ b/core/io/http_client.cpp
@@ -633,7 +633,7 @@ PackedByteArray HTTPClient::read_response_body_chunk() {
 
 					ret.resize(chunk.size() - 2);
 					uint8_t *w = ret.ptrw();
-					copymem(w, chunk.ptr(), chunk.size() - 2);
+					memcpy(w, chunk.ptr(), chunk.size() - 2);
 					chunk.clear();
 				}
 
diff --git a/core/io/image.cpp b/core/io/image.cpp
index 873eb66f33..c36fa6e45f 100644
--- a/core/io/image.cpp
+++ b/core/io/image.cpp
@@ -34,7 +34,6 @@
 #include "core/io/image_loader.h"
 #include "core/io/resource_loader.h"
 #include "core/math/math_funcs.h"
-#include "core/os/copymem.h"
 #include "core/string/print_string.h"
 #include "core/templates/hash_map.h"
 
@@ -1537,7 +1536,7 @@ void Image::shrink_x2() {
 			uint8_t *w = new_img.ptrw();
 			const uint8_t *r = data.ptr();
 
-			copymem(w, &r[ofs], new_size);
+			memcpy(w, &r[ofs], new_size);
 		}
 
 		width = MAX(width / 2, 1);
@@ -1932,7 +1931,7 @@ Error Image::generate_mipmap_roughness(RoughnessChannel p_roughness_channel, con
 
 
 			uint8_t* wr = imgdata.ptrw();
-			copymem(wr.ptr(), ptr, size);
+			memcpy(wr.ptr(), ptr, size);
 			wr = uint8_t*();
 			Ref<Image> im;
 			im.instance();
@@ -1982,7 +1981,7 @@ void Image::create(int p_width, int p_height, bool p_use_mipmaps, Format p_forma
 
 	{
 		uint8_t *w = data.ptrw();
-		zeromem(w, size);
+		memset(w, 0, size);
 	}
 
 	width = p_width;
@@ -3295,7 +3294,7 @@ Ref<Image> Image::get_image_from_mipmap(int p_mipamp) const {
 	{
 		uint8_t *wr = new_data.ptrw();
 		const uint8_t *rd = data.ptr();
-		copymem(wr, rd + ofs, size);
+		memcpy(wr, rd + ofs, size);
 	}
 
 	Ref<Image> image;
@@ -3622,5 +3621,5 @@ Ref<Resource> Image::duplicate(bool p_subresources) const {
 }
 
 void Image::set_as_black() {
-	zeromem(data.ptrw(), data.size());
+	memset(data.ptrw(), 0, data.size());
 }
diff --git a/core/io/marshalls.cpp b/core/io/marshalls.cpp
index 218a612da2..0282609270 100644
--- a/core/io/marshalls.cpp
+++ b/core/io/marshalls.cpp
@@ -851,7 +851,7 @@ static void _encode_string(const String &p_string, uint8_t *&buf, int &r_len) {
 	if (buf) {
 		encode_uint32(utf8.length(), buf);
 		buf += 4;
-		copymem(buf, utf8.get_data(), utf8.length());
+		memcpy(buf, utf8.get_data(), utf8.length());
 		buf += utf8.length();
 	}
 
@@ -995,7 +995,7 @@ Error encode_variant(const Variant &p_variant, uint8_t *r_buffer, int &r_len, bo
 				if (buf) {
 					encode_uint32(utf8.length(), buf);
 					buf += 4;
-					copymem(buf, utf8.get_data(), utf8.length());
+					memcpy(buf, utf8.get_data(), utf8.length());
 					buf += pad + utf8.length();
 				}
 
@@ -1079,7 +1079,7 @@ Error encode_variant(const Variant &p_variant, uint8_t *r_buffer, int &r_len, bo
 				Transform2D val = p_variant;
 				for (int i = 0; i < 3; i++) {
 					for (int j = 0; j < 2; j++) {
-						copymem(&buf[(i * 2 + j) * 4], &val.elements[i][j], sizeof(float));
+						memcpy(&buf[(i * 2 + j) * 4], &val.elements[i][j], sizeof(float));
 					}
 				}
 			}
@@ -1130,7 +1130,7 @@ Error encode_variant(const Variant &p_variant, uint8_t *r_buffer, int &r_len, bo
 				Basis val = p_variant;
 				for (int i = 0; i < 3; i++) {
 					for (int j = 0; j < 3; j++) {
-						copymem(&buf[(i * 3 + j) * 4], &val.elements[i][j], sizeof(float));
+						memcpy(&buf[(i * 3 + j) * 4], &val.elements[i][j], sizeof(float));
 					}
 				}
 			}
@@ -1143,7 +1143,7 @@ Error encode_variant(const Variant &p_variant, uint8_t *r_buffer, int &r_len, bo
 				Transform val = p_variant;
 				for (int i = 0; i < 3; i++) {
 					for (int j = 0; j < 3; j++) {
-						copymem(&buf[(i * 3 + j) * 4], &val.basis.elements[i][j], sizeof(float));
+						memcpy(&buf[(i * 3 + j) * 4], &val.basis.elements[i][j], sizeof(float));
 					}
 				}
 
@@ -1258,7 +1258,7 @@ Error encode_variant(const Variant &p_variant, uint8_t *r_buffer, int &r_len, bo
 				if (buf) {
 					encode_uint32(utf8.length()+1,buf);
 					buf+=4;
-					copymem(buf,utf8.get_data(),utf8.length()+1);
+					memcpy(buf,utf8.get_data(),utf8.length()+1);
 				}
 
 				r_len+=4+utf8.length()+1;
@@ -1314,7 +1314,7 @@ Error encode_variant(const Variant &p_variant, uint8_t *r_buffer, int &r_len, bo
 				encode_uint32(datalen, buf);
 				buf += 4;
 				const uint8_t *r = data.ptr();
-				copymem(buf, &r[0], datalen * datasize);
+				memcpy(buf, &r[0], datalen * datasize);
 				buf += datalen * datasize;
 			}
 
@@ -1412,7 +1412,7 @@ Error encode_variant(const Variant &p_variant, uint8_t *r_buffer, int &r_len, bo
 				if (buf) {
 					encode_uint32(utf8.length() + 1, buf);
 					buf += 4;
-					copymem(buf, utf8.get_data(), utf8.length() + 1);
+					memcpy(buf, utf8.get_data(), utf8.length() + 1);
 					buf += utf8.length() + 1;
 				}
 
diff --git a/core/io/multiplayer_api.cpp b/core/io/multiplayer_api.cpp
index 94060cfe0b..8414ee7c0c 100644
--- a/core/io/multiplayer_api.cpp
+++ b/core/io/multiplayer_api.cpp
@@ -897,7 +897,7 @@ void MultiplayerAPI::_send_rpc(Node *p_from, int p_to, bool p_unreliable, bool p
 			// Special optimization when only the byte vector is sent.
 			const Vector<uint8_t> data = *p_arg[0];
 			MAKE_ROOM(ofs + data.size());
-			copymem(&(packet_cache.write[ofs]), data.ptr(), sizeof(uint8_t) * data.size());
+			memcpy(&(packet_cache.write[ofs]), data.ptr(), sizeof(uint8_t) * data.size());
 			ofs += data.size();
 		} else {
 			// Arguments
diff --git a/core/io/packed_data_container.cpp b/core/io/packed_data_container.cpp
index a0b97772e6..c6354b11b7 100644
--- a/core/io/packed_data_container.cpp
+++ b/core/io/packed_data_container.cpp
@@ -317,7 +317,7 @@ Error PackedDataContainer::pack(const Variant &p_data) {
 	datalen = tmpdata.size();
 	data.resize(tmpdata.size());
 	uint8_t *w = data.ptrw();
-	copymem(w, tmpdata.ptr(), tmpdata.size());
+	memcpy(w, tmpdata.ptr(), tmpdata.size());
 
 	return OK;
 }
diff --git a/core/io/stream_peer.cpp b/core/io/stream_peer.cpp
index 8407d55196..74154321b3 100644
--- a/core/io/stream_peer.cpp
+++ b/core/io/stream_peer.cpp
@@ -433,7 +433,7 @@ Error StreamPeerBuffer::put_data(const uint8_t *p_data, int p_bytes) {
 	}
 
 	uint8_t *w = data.ptrw();
-	copymem(&w[pointer], p_data, p_bytes);
+	memcpy(&w[pointer], p_data, p_bytes);
 
 	pointer += p_bytes;
 	return OK;
@@ -466,7 +466,7 @@ Error StreamPeerBuffer::get_partial_data(uint8_t *p_buffer, int p_bytes, int &r_
 	}
 
 	const uint8_t *r = data.ptr();
-	copymem(p_buffer, r + pointer, r_received);
+	memcpy(p_buffer, r + pointer, r_received);
 
 	pointer += r_received;
 	// FIXME: return what? OK or ERR_*
diff --git a/core/io/xml_parser.cpp b/core/io/xml_parser.cpp
index d5eb32513b..a1f8e79adc 100644
--- a/core/io/xml_parser.cpp
+++ b/core/io/xml_parser.cpp
@@ -433,7 +433,7 @@ Error XMLParser::open_buffer(const Vector<uint8_t> &p_buffer) {
 
 	length = p_buffer.size();
 	data = memnew_arr(char, length + 1);
-	copymem(data, p_buffer.ptr(), length);
+	memcpy(data, p_buffer.ptr(), length);
 	data[length] = 0;
 	P = data;
 	return OK;
diff --git a/core/io/zip_io.cpp b/core/io/zip_io.cpp
index 4b4a46e198..fe46868dd0 100644
--- a/core/io/zip_io.cpp
+++ b/core/io/zip_io.cpp
@@ -30,8 +30,6 @@
 
 #include "zip_io.h"
 
-#include "core/os/copymem.h"
-
 void *zipio_open(void *data, const char *p_fname, int mode) {
 	FileAccess *&f = *(FileAccess **)data;
 
@@ -103,7 +101,7 @@ int zipio_testerror(voidpf opaque, voidpf stream) {
 
 voidpf zipio_alloc(voidpf opaque, uInt items, uInt size) {
 	voidpf ptr = memalloc(items * size);
-	zeromem(ptr, items * size);
+	memset(ptr, 0, items * size);
 	return ptr;
 }
 
diff --git a/core/math/basis.cpp b/core/math/basis.cpp
index cc2b7c6611..50299902eb 100644
--- a/core/math/basis.cpp
+++ b/core/math/basis.cpp
@@ -31,7 +31,6 @@
 #include "basis.h"
 
 #include "core/math/math_funcs.h"
-#include "core/os/copymem.h"
 #include "core/string/print_string.h"
 
 #define cofac(row1, col1, row2, col2) \
diff --git a/core/math/dynamic_bvh.h b/core/math/dynamic_bvh.h
index 3fb22515a2..0b6286cd9d 100644
--- a/core/math/dynamic_bvh.h
+++ b/core/math/dynamic_bvh.h
@@ -343,7 +343,7 @@ void DynamicBVH::aabb_query(const AABB &p_box, QueryResult &r_result) {
 				if (depth > threshold) {
 					if (aux_stack.is_empty()) {
 						aux_stack.resize(ALLOCA_STACK_SIZE * 2);
-						copymem(aux_stack.ptr(), stack, ALLOCA_STACK_SIZE * sizeof(const Node *));
+						memcpy(aux_stack.ptr(), stack, ALLOCA_STACK_SIZE * sizeof(const Node *));
 					} else {
 						aux_stack.resize(aux_stack.size() * 2);
 					}
@@ -399,7 +399,7 @@ void DynamicBVH::convex_query(const Plane *p_planes, int p_plane_count, const Ve
 				if (depth > threshold) {
 					if (aux_stack.is_empty()) {
 						aux_stack.resize(ALLOCA_STACK_SIZE * 2);
-						copymem(aux_stack.ptr(), stack, ALLOCA_STACK_SIZE * sizeof(const Node *));
+						memcpy(aux_stack.ptr(), stack, ALLOCA_STACK_SIZE * sizeof(const Node *));
 					} else {
 						aux_stack.resize(aux_stack.size() * 2);
 					}
@@ -456,7 +456,7 @@ void DynamicBVH::ray_query(const Vector3 &p_from, const Vector3 &p_to, QueryResu
 				if (depth > threshold) {
 					if (aux_stack.is_empty()) {
 						aux_stack.resize(ALLOCA_STACK_SIZE * 2);
-						copymem(aux_stack.ptr(), stack, ALLOCA_STACK_SIZE * sizeof(const Node *));
+						memcpy(aux_stack.ptr(), stack, ALLOCA_STACK_SIZE * sizeof(const Node *));
 					} else {
 						aux_stack.resize(aux_stack.size() * 2);
 					}
diff --git a/core/math/geometry_2d.cpp b/core/math/geometry_2d.cpp
index feb1fb2fb8..7b2630b4ff 100644
--- a/core/math/geometry_2d.cpp
+++ b/core/math/geometry_2d.cpp
@@ -358,7 +358,7 @@ Vector<Point2i> Geometry2D::pack_rects(const Vector<Size2i> &p_sizes, const Size
 Vector<Vector3i> Geometry2D::partial_pack_rects(const Vector<Vector2i> &p_sizes, const Size2i &p_atlas_size) {
 	Vector<stbrp_node> nodes;
 	nodes.resize(p_atlas_size.width);
-	zeromem(nodes.ptrw(), sizeof(stbrp_node) * nodes.size());
+	memset(nodes.ptrw(), 0, sizeof(stbrp_node) * nodes.size());
 
 	stbrp_context context;
 	stbrp_init_target(&context, p_atlas_size.width, p_atlas_size.height, nodes.ptrw(), p_atlas_size.width);
diff --git a/core/math/transform.cpp b/core/math/transform.cpp
index fab5d124fa..d4d7ff6d28 100644
--- a/core/math/transform.cpp
+++ b/core/math/transform.cpp
@@ -31,7 +31,6 @@
 #include "transform.h"
 
 #include "core/math/math_funcs.h"
-#include "core/os/copymem.h"
 #include "core/string/print_string.h"
 
 void Transform::affine_invert() {
diff --git a/core/object/callable_method_pointer.h b/core/object/callable_method_pointer.h
index 115797a00c..8ba01be4e4 100644
--- a/core/object/callable_method_pointer.h
+++ b/core/object/callable_method_pointer.h
@@ -32,7 +32,6 @@
 #define CALLABLE_METHOD_POINTER_H
 
 #include "core/object/object.h"
-#include "core/os/copymem.h"
 #include "core/templates/hashfuncs.h"
 #include "core/templates/simple_type.h"
 #include "core/variant/binder_common.h"
@@ -98,7 +97,7 @@ public:
 	}
 
 	CallableCustomMethodPointer(T *p_instance, void (T::*p_method)(P...)) {
-		zeromem(&data, sizeof(Data)); // Clear beforehand, may have padding bytes.
+		memset(&data, 0, sizeof(Data)); // Clear beforehand, may have padding bytes.
 		data.instance = p_instance;
 #ifdef DEBUG_ENABLED
 		data.object_id = p_instance->get_instance_id();
@@ -153,7 +152,7 @@ public:
 	}
 
 	CallableCustomMethodPointerRet(T *p_instance, R (T::*p_method)(P...)) {
-		zeromem(&data, sizeof(Data)); // Clear beforehand, may have padding bytes.
+		memset(&data, 0, sizeof(Data)); // Clear beforehand, may have padding bytes.
 		data.instance = p_instance;
 #ifdef DEBUG_ENABLED
 		data.object_id = p_instance->get_instance_id();
@@ -208,7 +207,7 @@ public:
 	}
 
 	CallableCustomMethodPointerRetC(T *p_instance, R (T::*p_method)(P...) const) {
-		zeromem(&data, sizeof(Data)); // Clear beforehand, may have padding bytes.
+		memset(&data, 0, sizeof(Data)); // Clear beforehand, may have padding bytes.
 		data.instance = p_instance;
 #ifdef DEBUG_ENABLED
 		data.object_id = p_instance->get_instance_id();
diff --git a/core/os/copymem.h b/core/os/copymem.h
deleted file mode 100644
index 6fd559356c..0000000000
--- a/core/os/copymem.h
+++ /dev/null
@@ -1,50 +0,0 @@
-/*************************************************************************/
-/*  copymem.h                                                            */
-/*************************************************************************/
-/*                       This file is part of:                           */
-/*                           GODOT ENGINE                                */
-/*                      https://godotengine.org                          */
-/*************************************************************************/
-/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
-/*                                                                       */
-/* Permission is hereby granted, free of charge, to any person obtaining */
-/* a copy of this software and associated documentation files (the       */
-/* "Software"), to deal in the Software without restriction, including   */
-/* without limitation the rights to use, copy, modify, merge, publish,   */
-/* distribute, sublicense, and/or sell copies of the Software, and to    */
-/* permit persons to whom the Software is furnished to do so, subject to */
-/* the following conditions:                                             */
-/*                                                                       */
-/* The above copyright notice and this permission notice shall be        */
-/* included in all copies or substantial portions of the Software.       */
-/*                                                                       */
-/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
-/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
-/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
-/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
-/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
-/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
-/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
-/*************************************************************************/
-
-#ifndef COPYMEM_H
-#define COPYMEM_H
-
-#include "core/typedefs.h"
-
-#ifdef PLATFORM_COPYMEM
-
-#include "platform_copymem.h" // included from platform/<current_platform>/platform_copymem.h"
-
-#else
-
-#include <string.h>
-
-#define copymem(to, from, count) memcpy(to, from, count)
-#define zeromem(to, count) memset(to, 0, count)
-#define movemem(to, from, count) memmove(to, from, count)
-
-#endif
-
-#endif // COPYMEM_H
diff --git a/core/os/memory.cpp b/core/os/memory.cpp
index 5910cb0e7b..a756c1d5dd 100644
--- a/core/os/memory.cpp
+++ b/core/os/memory.cpp
@@ -31,7 +31,6 @@
 #include "memory.h"
 
 #include "core/error/error_macros.h"
-#include "core/os/copymem.h"
 #include "core/templates/safe_refcount.h"
 
 #include <stdio.h>
diff --git a/core/os/pool_allocator.cpp b/core/os/pool_allocator.cpp
index 9be3a62e2f..74e9c24e04 100644
--- a/core/os/pool_allocator.cpp
+++ b/core/os/pool_allocator.cpp
@@ -31,7 +31,6 @@
 #include "pool_allocator.h"
 
 #include "core/error/error_macros.h"
-#include "core/os/copymem.h"
 #include "core/os/memory.h"
 #include "core/os/os.h"
 #include "core/string/print_string.h"
@@ -42,7 +41,7 @@
 	do {                                                      \
 		void *_dst = &((unsigned char *)pool)[m_to_pos];      \
 		void *_src = &((unsigned char *)pool)[(m_entry).pos]; \
-		movemem(_dst, _src, aligned((m_entry).len));          \
+		memmove(_dst, _src, aligned((m_entry).len));          \
 		(m_entry).pos = m_to_pos;                             \
 	} while (0);
 
diff --git a/core/string/ustring.cpp b/core/string/ustring.cpp
index cf0040353d..c8d71c3236 100644
--- a/core/string/ustring.cpp
+++ b/core/string/ustring.cpp
@@ -4765,7 +4765,7 @@ Vector<uint8_t> String::to_ascii_buffer() const {
 	size_t len = charstr.length();
 	retval.resize(len);
 	uint8_t *w = retval.ptrw();
-	copymem(w, charstr.ptr(), len);
+	memcpy(w, charstr.ptr(), len);
 
 	return retval;
 }
@@ -4781,7 +4781,7 @@ Vector<uint8_t> String::to_utf8_buffer() const {
 	size_t len = charstr.length();
 	retval.resize(len);
 	uint8_t *w = retval.ptrw();
-	copymem(w, charstr.ptr(), len);
+	memcpy(w, charstr.ptr(), len);
 
 	return retval;
 }
@@ -4797,7 +4797,7 @@ Vector<uint8_t> String::to_utf16_buffer() const {
 	size_t len = charstr.length() * sizeof(char16_t);
 	retval.resize(len);
 	uint8_t *w = retval.ptrw();
-	copymem(w, (const void *)charstr.ptr(), len);
+	memcpy(w, (const void *)charstr.ptr(), len);
 
 	return retval;
 }
@@ -4812,7 +4812,7 @@ Vector<uint8_t> String::to_utf32_buffer() const {
 	size_t len = s->length() * sizeof(char32_t);
 	retval.resize(len);
 	uint8_t *w = retval.ptrw();
-	copymem(w, (const void *)s->ptr(), len);
+	memcpy(w, (const void *)s->ptr(), len);
 
 	return retval;
 }
diff --git a/core/templates/local_vector.h b/core/templates/local_vector.h
index ffd17b7ee9..5f22e08eb8 100644
--- a/core/templates/local_vector.h
+++ b/core/templates/local_vector.h
@@ -32,7 +32,6 @@
 #define LOCAL_VECTOR_H
 
 #include "core/error/error_macros.h"
-#include "core/os/copymem.h"
 #include "core/os/memory.h"
 #include "core/templates/sort_array.h"
 #include "core/templates/vector.h"
@@ -216,7 +215,7 @@ public:
 		Vector<T> ret;
 		ret.resize(size());
 		T *w = ret.ptrw();
-		copymem(w, data, sizeof(T) * count);
+		memcpy(w, data, sizeof(T) * count);
 		return ret;
 	}
 
@@ -224,7 +223,7 @@ public:
 		Vector<uint8_t> ret;
 		ret.resize(count * sizeof(T));
 		uint8_t *w = ret.ptrw();
-		copymem(w, data, sizeof(T) * count);
+		memcpy(w, data, sizeof(T) * count);
 		return ret;
 	}
 
diff --git a/core/templates/oa_hash_map.h b/core/templates/oa_hash_map.h
index 1d4176eb10..2c7c64cd78 100644
--- a/core/templates/oa_hash_map.h
+++ b/core/templates/oa_hash_map.h
@@ -32,7 +32,6 @@
 #define OA_HASH_MAP_H
 
 #include "core/math/math_funcs.h"
-#include "core/os/copymem.h"
 #include "core/os/memory.h"
 #include "core/templates/hashfuncs.h"
 
diff --git a/core/templates/vector.h b/core/templates/vector.h
index a56a941dbc..4cd68aeb5c 100644
--- a/core/templates/vector.h
+++ b/core/templates/vector.h
@@ -38,7 +38,6 @@
 */
 
 #include "core/error/error_macros.h"
-#include "core/os/copymem.h"
 #include "core/os/memory.h"
 #include "core/templates/cowdata.h"
 #include "core/templates/sort_array.h"
@@ -134,7 +133,7 @@ public:
 	Vector<uint8_t> to_byte_array() const {
 		Vector<uint8_t> ret;
 		ret.resize(size() * sizeof(T));
-		copymem(ret.ptrw(), ptr(), sizeof(T) * size());
+		memcpy(ret.ptrw(), ptr(), sizeof(T) * size());
 		return ret;
 	}
 
diff --git a/core/variant/variant_call.cpp b/core/variant/variant_call.cpp
index 7f83e27dfe..c8d26f02cb 100644
--- a/core/variant/variant_call.cpp
+++ b/core/variant/variant_call.cpp
@@ -500,7 +500,7 @@ struct _VariantCall {
 			const uint8_t *r = p_instance->ptr();
 			CharString cs;
 			cs.resize(p_instance->size() + 1);
-			copymem(cs.ptrw(), r, p_instance->size());
+			memcpy(cs.ptrw(), r, p_instance->size());
 			cs[p_instance->size()] = 0;
 
 			s = cs.get_data();
diff --git a/core/variant/variant_op.cpp b/core/variant/variant_op.cpp
index e0a3cf4215..6cbc98d14d 100644
--- a/core/variant/variant_op.cpp
+++ b/core/variant/variant_op.cpp
@@ -1365,10 +1365,10 @@ void register_op(Variant::Operator p_op, Variant::Type p_type_a, Variant::Type p
 }
 
 void Variant::_register_variant_operators() {
-	zeromem(operator_return_type_table, sizeof(operator_return_type_table));
-	zeromem(operator_evaluator_table, sizeof(operator_evaluator_table));
-	zeromem(validated_operator_evaluator_table, sizeof(validated_operator_evaluator_table));
-	zeromem(ptr_operator_evaluator_table, sizeof(ptr_operator_evaluator_table));
+	memset(operator_return_type_table, 0, sizeof(operator_return_type_table));
+	memset(operator_evaluator_table, 0, sizeof(operator_evaluator_table));
+	memset(validated_operator_evaluator_table, 0, sizeof(validated_operator_evaluator_table));
+	memset(ptr_operator_evaluator_table, 0, sizeof(ptr_operator_evaluator_table));
 
 	register_op<OperatorEvaluatorAdd<int64_t, int64_t, int64_t>>(Variant::OP_ADD, Variant::INT, Variant::INT);
 	register_op<OperatorEvaluatorAdd<double, int64_t, double>>(Variant::OP_ADD, Variant::INT, Variant::FLOAT);