[dynarmic] replace mcl::bit_cast with std one (#2866)

Don't merge till it works on steamdeck :)
Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2866
Reviewed-by: Maufeat <sahyno1996@gmail.com>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: Caio Oliveira <caiooliveirafarias0@gmail.com>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

src/dynarmic/src/dynarmic/backend/arm64/a32_address_space.cpp

@@ -93,9 +93,9 @@ static void* EmitExclusiveReadCallTrampoline(oaknut::CodeGenerator& code, const
 
     code.align(8);
     code.l(l_this);
-    code.dx(mcl::bit_cast<u64>(&conf));
+    code.dx(std::bit_cast<u64>(&conf));
     code.l(l_addr);
-    code.dx(mcl::bit_cast<u64>(Common::FptrCast(fn)));
+    code.dx(std::bit_cast<u64>(Common::FptrCast(fn)));
 
     return target;
 }
@@ -151,9 +151,9 @@ static void* EmitExclusiveWriteCallTrampoline(oaknut::CodeGenerator& code, const
 
     code.align(8);
     code.l(l_this);
-    code.dx(mcl::bit_cast<u64>(&conf));
+    code.dx(std::bit_cast<u64>(&conf));
     code.l(l_addr);
-    code.dx(mcl::bit_cast<u64>(Common::FptrCast(fn)));
+    code.dx(std::bit_cast<u64>(Common::FptrCast(fn)));
 
     return target;
 }
@@ -219,7 +219,7 @@ void A32AddressSpace::EmitPrelude() {
         code.MOV(Xstate, X1);
         code.MOV(Xhalt, X2);
         if (conf.page_table) {
-            code.MOV(Xpagetable, mcl::bit_cast<u64>(conf.page_table));
+            code.MOV(Xpagetable, std::bit_cast<u64>(conf.page_table));
         }
         if (conf.fastmem_pointer) {
             code.MOV(Xfastmem, *conf.fastmem_pointer);
@@ -258,7 +258,7 @@ void A32AddressSpace::EmitPrelude() {
         code.MOV(Xstate, X1);
         code.MOV(Xhalt, X2);
         if (conf.page_table) {
-            code.MOV(Xpagetable, mcl::bit_cast<u64>(conf.page_table));
+            code.MOV(Xpagetable, std::bit_cast<u64>(conf.page_table));
         }
         if (conf.fastmem_pointer) {
             code.MOV(Xfastmem, *conf.fastmem_pointer);
@@ -317,9 +317,9 @@ void A32AddressSpace::EmitPrelude() {
 
         code.align(8);
         code.l(l_this);
-        code.dx(mcl::bit_cast<u64>(this));
+        code.dx(std::bit_cast<u64>(this));
         code.l(l_addr);
-        code.dx(mcl::bit_cast<u64>(Common::FptrCast(fn)));
+        code.dx(std::bit_cast<u64>(Common::FptrCast(fn)));
     }
 
     prelude_info.return_from_run_code = code.xptr<void*>();
@@ -347,7 +347,7 @@ void A32AddressSpace::EmitPrelude() {
 
     code.align(8);
     code.l(l_return_to_dispatcher);
-    code.dx(mcl::bit_cast<u64>(prelude_info.return_to_dispatcher));
+    code.dx(std::bit_cast<u64>(prelude_info.return_to_dispatcher));
 
     prelude_info.end_of_prelude = code.offset();
 
@@ -369,7 +369,7 @@ EmitConfig A32AddressSpace::GetEmitConfig() {
 
         .check_halt_on_memory_access = conf.check_halt_on_memory_access,
 
-        .page_table_pointer = mcl::bit_cast<u64>(conf.page_table),
+        .page_table_pointer = std::bit_cast<u64>(conf.page_table),
         .page_table_address_space_bits = 32,
         .page_table_pointer_mask_bits = conf.page_table_pointer_mask_bits,
         .silently_mirror_page_table = true,

src/dynarmic/src/dynarmic/backend/arm64/a64_address_space.cpp

@@ -92,9 +92,9 @@ static void* EmitExclusiveReadCallTrampoline(oaknut::CodeGenerator& code, const
 
     code.align(8);
     code.l(l_this);
-    code.dx(mcl::bit_cast<u64>(&conf));
+    code.dx(std::bit_cast<u64>(&conf));
     code.l(l_addr);
-    code.dx(mcl::bit_cast<u64>(Common::FptrCast(fn)));
+    code.dx(std::bit_cast<u64>(Common::FptrCast(fn)));
 
     return target;
 }
@@ -150,9 +150,9 @@ static void* EmitExclusiveWriteCallTrampoline(oaknut::CodeGenerator& code, const
 
     code.align(8);
     code.l(l_this);
-    code.dx(mcl::bit_cast<u64>(&conf));
+    code.dx(std::bit_cast<u64>(&conf));
     code.l(l_addr);
-    code.dx(mcl::bit_cast<u64>(Common::FptrCast(fn)));
+    code.dx(std::bit_cast<u64>(Common::FptrCast(fn)));
 
     return target;
 }
@@ -235,9 +235,9 @@ static void* EmitExclusiveRead128CallTrampoline(oaknut::CodeGenerator& code, con
 
     code.align(8);
     code.l(l_this);
-    code.dx(mcl::bit_cast<u64>(&conf));
+    code.dx(std::bit_cast<u64>(&conf));
     code.l(l_addr);
-    code.dx(mcl::bit_cast<u64>(Common::FptrCast(fn)));
+    code.dx(std::bit_cast<u64>(Common::FptrCast(fn)));
 
     return target;
 }
@@ -317,9 +317,9 @@ static void* EmitExclusiveWrite128CallTrampoline(oaknut::CodeGenerator& code, co
 
     code.align(8);
     code.l(l_this);
-    code.dx(mcl::bit_cast<u64>(&conf));
+    code.dx(std::bit_cast<u64>(&conf));
     code.l(l_addr);
-    code.dx(mcl::bit_cast<u64>(Common::FptrCast(fn)));
+    code.dx(std::bit_cast<u64>(Common::FptrCast(fn)));
 
     return target;
 }
@@ -396,7 +396,7 @@ void A64AddressSpace::EmitPrelude() {
         code.MOV(Xstate, X1);
         code.MOV(Xhalt, X2);
         if (conf.page_table) {
-            code.MOV(Xpagetable, mcl::bit_cast<u64>(conf.page_table));
+            code.MOV(Xpagetable, std::bit_cast<u64>(conf.page_table));
         }
         if (conf.fastmem_pointer) {
             code.MOV(Xfastmem, *conf.fastmem_pointer);
@@ -434,7 +434,7 @@ void A64AddressSpace::EmitPrelude() {
         code.MOV(Xstate, X1);
         code.MOV(Xhalt, X2);
         if (conf.page_table) {
-            code.MOV(Xpagetable, mcl::bit_cast<u64>(conf.page_table));
+            code.MOV(Xpagetable, std::bit_cast<u64>(conf.page_table));
         }
         if (conf.fastmem_pointer) {
             code.MOV(Xfastmem, *conf.fastmem_pointer);
@@ -492,9 +492,9 @@ void A64AddressSpace::EmitPrelude() {
 
         code.align(8);
         code.l(l_this);
-        code.dx(mcl::bit_cast<u64>(this));
+        code.dx(std::bit_cast<u64>(this));
         code.l(l_addr);
-        code.dx(mcl::bit_cast<u64>(Common::FptrCast(fn)));
+        code.dx(std::bit_cast<u64>(Common::FptrCast(fn)));
     }
 
     prelude_info.return_from_run_code = code.xptr<void*>();
@@ -522,7 +522,7 @@ void A64AddressSpace::EmitPrelude() {
 
     code.align(8);
     code.l(l_return_to_dispatcher);
-    code.dx(mcl::bit_cast<u64>(prelude_info.return_to_dispatcher));
+    code.dx(std::bit_cast<u64>(prelude_info.return_to_dispatcher));
 
     prelude_info.end_of_prelude = code.offset();
 
@@ -544,7 +544,7 @@ EmitConfig A64AddressSpace::GetEmitConfig() {
 
         .check_halt_on_memory_access = conf.check_halt_on_memory_access,
 
-        .page_table_pointer = mcl::bit_cast<u64>(conf.page_table),
+        .page_table_pointer = std::bit_cast<u64>(conf.page_table),
         .page_table_address_space_bits = conf.page_table_address_space_bits,
         .page_table_pointer_mask_bits = conf.page_table_pointer_mask_bits,
         .silently_mirror_page_table = conf.silently_mirror_page_table,

src/dynarmic/src/dynarmic/backend/arm64/address_space.cpp

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 /* This file is part of the dynarmic project.
  * Copyright (c) 2022 MerryMage
  * SPDX-License-Identifier: 0BSD
@@ -5,7 +8,7 @@
 
 #include <cstdio>
 
-#include <mcl/bit_cast.hpp>
+#include <bit>
 
 #include "dynarmic/backend/arm64/a64_address_space.h"
 #include "dynarmic/backend/arm64/a64_jitstate.h"
@@ -99,7 +102,7 @@ void AddressSpace::ClearCache() {
 
 void AddressSpace::DumpDisassembly() const {
     for (u32* ptr = mem.ptr(); ptr < code.xptr<u32*>(); ptr++) {
-        std::printf("%s", Common::DisassembleAArch64(*ptr, mcl::bit_cast<u64>(ptr)).c_str());
+        std::printf("%s", Common::DisassembleAArch64(*ptr, std::bit_cast<u64>(ptr)).c_str());
     }
 }
 
@@ -316,7 +319,7 @@ void AddressSpace::RelinkForDescriptor(IR::LocationDescriptor target_descriptor,
 
 FakeCall AddressSpace::FastmemCallback(u64 host_pc) {
     {
-        const auto host_ptr = mcl::bit_cast<CodePtr>(host_pc);
+        const auto host_ptr = std::bit_cast<CodePtr>(host_pc);
 
         const auto entry_point = ReverseGetEntryPoint(host_ptr);
         if (!entry_point) {

src/dynarmic/src/dynarmic/backend/arm64/devirtualize.h

@@ -8,12 +8,20 @@
 
 #pragma once
 
-#include <mcl/bit_cast.hpp>
+#include <bit>
 #include "dynarmic/common/common_types.h"
 #include <mcl/type_traits/function_info.hpp>
 
 namespace Dynarmic::Backend::Arm64 {
 
+namespace impl {
+template<typename T, typename P> inline T bit_cast_pointee(const P source_ptr) noexcept {
+    std::aligned_storage_t<sizeof(T), alignof(T)> dest;
+    std::memcpy(&dest, std::bit_cast<void*>(source_ptr), sizeof(T));
+    return reinterpret_cast<T&>(dest);
+}
+};
+
 struct DevirtualizedCall {
     u64 fn_ptr;
     u64 this_ptr;
@@ -23,7 +31,7 @@ struct DevirtualizedCall {
 template<auto mfp>
 DevirtualizedCall DevirtualizeWindows(mcl::class_type<decltype(mfp)>* this_) {
     static_assert(sizeof(mfp) == 8);
-    return DevirtualizedCall{mcl::bit_cast<u64>(mfp), reinterpret_cast<u64>(this_)};
+    return DevirtualizedCall{std::bit_cast<u64>(mfp), reinterpret_cast<u64>(this_)};
 }
 
 // https://github.com/ARM-software/abi-aa/blob/main/cppabi64/cppabi64.rst#representation-of-pointer-to-member-function
@@ -34,16 +42,16 @@ DevirtualizedCall DevirtualizeDefault(mcl::class_type<decltype(mfp)>* this_) {
         u64 ptr;
         // LSB is discriminator for if function is virtual. Other bits are this adjustment.
         u64 adj;
-    } mfp_struct = mcl::bit_cast<MemberFunctionPointer>(mfp);
+    } mfp_struct = std::bit_cast<MemberFunctionPointer>(mfp);
 
     static_assert(sizeof(MemberFunctionPointer) == 16);
     static_assert(sizeof(MemberFunctionPointer) == sizeof(mfp));
 
     u64 fn_ptr = mfp_struct.ptr;
-    u64 this_ptr = mcl::bit_cast<u64>(this_) + (mfp_struct.adj >> 1);
+    u64 this_ptr = std::bit_cast<u64>(this_) + (mfp_struct.adj >> 1);
     if (mfp_struct.adj & 1) {
-        u64 vtable = mcl::bit_cast_pointee<u64>(this_ptr);
-        fn_ptr = mcl::bit_cast_pointee<u64>(vtable + fn_ptr);
+        u64 vtable = impl::bit_cast_pointee<u64>(this_ptr);
+        fn_ptr = impl::bit_cast_pointee<u64>(vtable + fn_ptr);
     }
     return DevirtualizedCall{fn_ptr, this_ptr};
 }

src/dynarmic/src/dynarmic/backend/arm64/emit_arm64_a64.cpp

@@ -1,9 +1,12 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 /* This file is part of the dynarmic project.
  * Copyright (c) 2022 MerryMage
  * SPDX-License-Identifier: 0BSD
  */
 
-#include <mcl/bit_cast.hpp>
+#include <bit>
 #include <oaknut/oaknut.hpp>
 
 #include "dynarmic/backend/arm64/a64_jitstate.h"
@@ -495,7 +498,7 @@ template<>
 void EmitIR<IR::Opcode::A64GetTPIDR>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
     auto Xvalue = ctx.reg_alloc.WriteX(inst);
     RegAlloc::Realize(Xvalue);
-    code.MOV(Xscratch0, mcl::bit_cast<u64>(ctx.conf.tpidr_el0));
+    code.MOV(Xscratch0, std::bit_cast<u64>(ctx.conf.tpidr_el0));
     code.LDR(Xvalue, Xscratch0);
 }
 
@@ -503,7 +506,7 @@ template<>
 void EmitIR<IR::Opcode::A64GetTPIDRRO>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
     auto Xvalue = ctx.reg_alloc.WriteX(inst);
     RegAlloc::Realize(Xvalue);
-    code.MOV(Xscratch0, mcl::bit_cast<u64>(ctx.conf.tpidrro_el0));
+    code.MOV(Xscratch0, std::bit_cast<u64>(ctx.conf.tpidrro_el0));
     code.LDR(Xvalue, Xscratch0);
 }
 
@@ -512,7 +515,7 @@ void EmitIR<IR::Opcode::A64SetTPIDR>(oaknut::CodeGenerator& code, EmitContext& c
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
     auto Xvalue = ctx.reg_alloc.ReadX(args[0]);
     RegAlloc::Realize(Xvalue);
-    code.MOV(Xscratch0, mcl::bit_cast<u64>(ctx.conf.tpidr_el0));
+    code.MOV(Xscratch0, std::bit_cast<u64>(ctx.conf.tpidr_el0));
     code.STR(Xvalue, Xscratch0);
 }
 

src/dynarmic/src/dynarmic/backend/arm64/emit_arm64_memory.cpp

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 /* This file is part of the dynarmic project.
  * Copyright (c) 2022 MerryMage
  * SPDX-License-Identifier: 0BSD
@@ -8,7 +11,7 @@
 #include <optional>
 #include <utility>
 
-#include <mcl/bit_cast.hpp>
+#include <bit>
 #include <oaknut/oaknut.hpp>
 
 #include "dynarmic/backend/arm64/abi.h"
@@ -548,7 +551,7 @@ void FastmemEmitReadMemory(oaknut::CodeGenerator& code, EmitContext& ctx, IR::In
             FastmemPatchInfo{
                 .marker = marker,
                 .fc = FakeCall{
-                    .call_pc = mcl::bit_cast<u64>(code.xptr<void*>()),
+                    .call_pc = std::bit_cast<u64>(code.xptr<void*>()),
                 },
                 .recompile = ctx.conf.recompile_on_fastmem_failure,
             });
@@ -598,7 +601,7 @@ void FastmemEmitWriteMemory(oaknut::CodeGenerator& code, EmitContext& ctx, IR::I
             FastmemPatchInfo{
                 .marker = marker,
                 .fc = FakeCall{
-                    .call_pc = mcl::bit_cast<u64>(code.xptr<void*>()),
+                    .call_pc = std::bit_cast<u64>(code.xptr<void*>()),
                 },
                 .recompile = ctx.conf.recompile_on_fastmem_failure,
             });

src/dynarmic/src/dynarmic/backend/arm64/emit_arm64_vector_floating_point.cpp

@@ -6,7 +6,7 @@
  * SPDX-License-Identifier: 0BSD
  */
 
-#include <mcl/bit_cast.hpp>
+#include <bit>
 #include <mcl/mp/metavalue/lift_value.hpp>
 #include <mcl/mp/typelist/cartesian_product.hpp>
 #include <mcl/mp/typelist/get.hpp>
@@ -271,7 +271,7 @@ static void EmitTwoOpFallbackWithoutRegAlloc(oaknut::CodeGenerator& code, EmitCo
 
     ABI_PushRegisters(code, ABI_CALLER_SAVE & ~(1ull << Qresult.index()), stack_size);
 
-    code.MOV(Xscratch0, mcl::bit_cast<u64>(fn));
+    code.MOV(Xscratch0, std::bit_cast<u64>(fn));
     code.ADD(X0, SP, 0 * 16);
     code.ADD(X1, SP, 1 * 16);
     code.MOV(X2, fpcr);

src/dynarmic/src/dynarmic/backend/arm64/reg_alloc.cpp

@@ -14,7 +14,7 @@
 
 #include "dynarmic/common/assert.h"
 #include <mcl/bit/bit_field.hpp>
-#include <mcl/bit_cast.hpp>
+#include <bit>
 #include <mcl/mp/metavalue/lift_value.hpp>
 #include "dynarmic/common/common_types.h"
 
@@ -246,7 +246,7 @@ void RegAlloc::AssertNoMoreUses() const {
 }
 
 void RegAlloc::EmitVerboseDebuggingOutput() {
-    code.MOV(X19, mcl::bit_cast<u64>(&PrintVerboseDebuggingOutputLine));  // Non-volatile register
+    code.MOV(X19, std::bit_cast<u64>(&PrintVerboseDebuggingOutputLine));  // Non-volatile register
 
     const auto do_location = [&](HostLocInfo& info, HostLocType type, size_t index) {
         using namespace oaknut::util;

src/dynarmic/src/dynarmic/backend/exception_handler_macos.cpp

@@ -19,7 +19,7 @@
 
 #include <fmt/format.h>
 #include "dynarmic/common/assert.h"
-#include <mcl/bit_cast.hpp>
+#include <bit>
 #include <mcl/macro/architecture.hpp>
 #include "dynarmic/common/common_types.h"
 
@@ -146,7 +146,7 @@ kern_return_t MachHandler::HandleRequest(x86_thread_state64_t* ts) {
     FakeCall fc = iter->cb(ts->__rip);
 
     ts->__rsp -= sizeof(u64);
-    *mcl::bit_cast<u64*>(ts->__rsp) = fc.ret_rip;
+    *std::bit_cast<u64*>(ts->__rsp) = fc.ret_rip;
     ts->__rip = fc.call_rip;
 
     return KERN_SUCCESS;
@@ -271,13 +271,13 @@ ExceptionHandler::~ExceptionHandler() = default;
 
 #if defined(ARCHITECTURE_x86_64)
 void ExceptionHandler::Register(X64::BlockOfCode& code) {
-    const u64 code_begin = mcl::bit_cast<u64>(code.getCode());
+    const u64 code_begin = std::bit_cast<u64>(code.getCode());
     const u64 code_end = code_begin + code.GetTotalCodeSize();
     impl = std::make_unique<Impl>(code_begin, code_end);
 }
 #elif defined(ARCHITECTURE_arm64)
 void ExceptionHandler::Register(oaknut::CodeBlock& mem, std::size_t size) {
-    const u64 code_begin = mcl::bit_cast<u64>(mem.ptr());
+    const u64 code_begin = std::bit_cast<u64>(mem.ptr());
     const u64 code_end = code_begin + size;
     impl = std::make_unique<Impl>(code_begin, code_end);
 }

src/dynarmic/src/dynarmic/backend/exception_handler_posix.cpp

@@ -27,7 +27,7 @@
 #else
 #    error "Invalid architecture"
 #endif
-#include <mcl/bit_cast.hpp>
+#include <bit>
 
 namespace Dynarmic::Backend {
 
@@ -122,7 +122,7 @@ void SigHandler::SigAction(int sig, siginfo_t* info, void* raw_context) {
         if (auto const iter = sig_handler->FindCodeBlockInfo(CTX_RIP); iter != sig_handler->code_block_infos.end()) {
             FakeCall fc = iter->second.cb(CTX_RIP);
             CTX_RSP -= sizeof(u64);
-            *mcl::bit_cast<u64*>(CTX_RSP) = fc.ret_rip;
+            *std::bit_cast<u64*>(CTX_RSP) = fc.ret_rip;
             CTX_RIP = fc.call_rip;
             return;
         }
@@ -189,15 +189,15 @@ ExceptionHandler::~ExceptionHandler() = default;
 
 #if defined(MCL_ARCHITECTURE_X86_64)
 void ExceptionHandler::Register(X64::BlockOfCode& code) {
-    impl = std::make_unique<Impl>(mcl::bit_cast<u64>(code.getCode()), code.GetTotalCodeSize());
+    impl = std::make_unique<Impl>(std::bit_cast<u64>(code.getCode()), code.GetTotalCodeSize());
 }
 #elif defined(MCL_ARCHITECTURE_ARM64)
 void ExceptionHandler::Register(oaknut::CodeBlock& mem, std::size_t size) {
-    impl = std::make_unique<Impl>(mcl::bit_cast<u64>(mem.ptr()), size);
+    impl = std::make_unique<Impl>(std::bit_cast<u64>(mem.ptr()), size);
 }
 #elif defined(MCL_ARCHITECTURE_RISCV)
 void ExceptionHandler::Register(RV64::CodeBlock& mem, std::size_t size) {
-    impl = std::make_unique<Impl>(mcl::bit_cast<u64>(mem.ptr<u64>()), size);
+    impl = std::make_unique<Impl>(std::bit_cast<u64>(mem.ptr<u64>()), size);
 }
 #else
 #    error "Invalid architecture"

src/dynarmic/src/dynarmic/backend/x64/a32_interface.cpp

@@ -13,7 +13,7 @@
 #include <boost/icl/interval_set.hpp>
 #include <fmt/format.h>
 #include "dynarmic/common/assert.h"
-#include <mcl/bit_cast.hpp>
+#include <bit>
 #include <mcl/scope_exit.hpp>
 #include "dynarmic/common/common_types.h"
 
@@ -47,7 +47,7 @@ static RunCodeCallbacks GenRunCodeCallbacks(A32::UserCallbacks* cb, CodePtr (*Lo
 static std::function<void(BlockOfCode&)> GenRCP(const A32::UserConfig& conf) {
     return [conf](BlockOfCode& code) {
         if (conf.page_table) {
-            code.mov(code.r14, mcl::bit_cast<u64>(conf.page_table));
+            code.mov(code.r14, std::bit_cast<u64>(conf.page_table));
         }
         if (conf.fastmem_pointer) {
             code.mov(code.r13, *conf.fastmem_pointer);

src/dynarmic/src/dynarmic/backend/x64/a64_interface.cpp

@@ -12,7 +12,7 @@
 
 #include <boost/icl/interval_set.hpp>
 #include "dynarmic/common/assert.h"
-#include <mcl/bit_cast.hpp>
+#include <bit>
 #include <mcl/scope_exit.hpp>
 
 #include "dynarmic/backend/x64/a64_emit_x64.h"
@@ -43,7 +43,7 @@ static RunCodeCallbacks GenRunCodeCallbacks(A64::UserCallbacks* cb, CodePtr (*Lo
 static std::function<void(BlockOfCode&)> GenRCP(const A64::UserConfig& conf) {
     return [conf](BlockOfCode& code) {
         if (conf.page_table) {
-            code.mov(code.r14, mcl::bit_cast<u64>(conf.page_table));
+            code.mov(code.r14, std::bit_cast<u64>(conf.page_table));
         }
         if (conf.fastmem_pointer) {
             code.mov(code.r13, *conf.fastmem_pointer);

src/dynarmic/src/dynarmic/backend/x64/devirtualize.h

@@ -11,7 +11,7 @@
 #include <cstring>
 #include <utility>
 
-#include <mcl/bit_cast.hpp>
+#include <bit>
 #include "dynarmic/common/common_types.h"
 #include <mcl/type_traits/function_info.hpp>
 
@@ -32,6 +32,12 @@ struct ThunkBuilder<R (C::*)(Args...), mfp> {
     }
 };
 
+template<typename T, typename P> inline T bit_cast_pointee(const P source_ptr) noexcept {
+    std::aligned_storage_t<sizeof(T), alignof(T)> dest;
+    std::memcpy(&dest, std::bit_cast<void*>(source_ptr), sizeof(T));
+    return reinterpret_cast<T&>(dest);
+}
+
 }  // namespace impl
 
 template<auto mfp>
@@ -42,7 +48,7 @@ ArgCallback DevirtualizeGeneric(mcl::class_type<decltype(mfp)>* this_) {
 template<auto mfp>
 ArgCallback DevirtualizeWindows(mcl::class_type<decltype(mfp)>* this_) {
     static_assert(sizeof(mfp) == 8);
-    return ArgCallback{mcl::bit_cast<u64>(mfp), reinterpret_cast<u64>(this_)};
+    return ArgCallback{std::bit_cast<u64>(mfp), reinterpret_cast<u64>(this_)};
 }
 
 template<auto mfp>
@@ -53,7 +59,7 @@ ArgCallback DevirtualizeItanium(mcl::class_type<decltype(mfp)>* this_) {
         u64 ptr;
         /// The required adjustment to `this`, prior to the call.
         u64 adj;
-    } mfp_struct = mcl::bit_cast<MemberFunctionPointer>(mfp);
+    } mfp_struct = std::bit_cast<MemberFunctionPointer>(mfp);
 
     static_assert(sizeof(MemberFunctionPointer) == 16);
     static_assert(sizeof(MemberFunctionPointer) == sizeof(mfp));
@@ -61,8 +67,8 @@ ArgCallback DevirtualizeItanium(mcl::class_type<decltype(mfp)>* this_) {
     u64 fn_ptr = mfp_struct.ptr;
     u64 this_ptr = reinterpret_cast<u64>(this_) + mfp_struct.adj;
     if (mfp_struct.ptr & 1) {
-        u64 vtable = mcl::bit_cast_pointee<u64>(this_ptr);
-        fn_ptr = mcl::bit_cast_pointee<u64>(vtable + fn_ptr - 1);
+        u64 vtable = impl::bit_cast_pointee<u64>(this_ptr);
+        fn_ptr = impl::bit_cast_pointee<u64>(vtable + fn_ptr - 1);
     }
     return ArgCallback{fn_ptr, this_ptr};
 }

src/dynarmic/src/dynarmic/backend/x64/emit_x64_memory.cpp.inc

@@ -102,10 +102,10 @@ void AxxEmitX64::EmitMemoryRead(AxxEmitContext& ctx, IR::Inst* inst) {
             code.call(wrapped_fn);
 
             fastmem_patch_info.emplace(
-                mcl::bit_cast<u64>(location),
+                std::bit_cast<u64>(location),
                 FastmemPatchInfo{
-                    mcl::bit_cast<u64>(code.getCurr()),
-                    mcl::bit_cast<u64>(wrapped_fn),
+                    std::bit_cast<u64>(code.getCurr()),
+                    std::bit_cast<u64>(wrapped_fn),
                     *fastmem_marker,
                     conf.recompile_on_fastmem_failure,
                 });
@@ -189,10 +189,10 @@ void AxxEmitX64::EmitMemoryWrite(AxxEmitContext& ctx, IR::Inst* inst) {
             code.call(wrapped_fn);
 
             fastmem_patch_info.emplace(
-                mcl::bit_cast<u64>(location),
+                std::bit_cast<u64>(location),
                 FastmemPatchInfo{
-                    mcl::bit_cast<u64>(code.getCurr()),
-                    mcl::bit_cast<u64>(wrapped_fn),
+                    std::bit_cast<u64>(code.getCurr()),
+                    std::bit_cast<u64>(wrapped_fn),
                     *fastmem_marker,
                     conf.recompile_on_fastmem_failure,
                 });
@@ -349,7 +349,7 @@ void AxxEmitX64::EmitExclusiveReadMemoryInline(AxxEmitContext& ctx, IR::Inst* in
     EmitExclusiveLock(code, conf, tmp, tmp2.cvt32());
 
     code.mov(code.byte[code.ABI_JIT_PTR + offsetof(AxxJitState, exclusive_state)], u8(1));
-    code.mov(tmp, mcl::bit_cast<u64>(GetExclusiveMonitorAddressPointer(conf.global_monitor, conf.processor_id)));
+    code.mov(tmp, std::bit_cast<u64>(GetExclusiveMonitorAddressPointer(conf.global_monitor, conf.processor_id)));
     code.mov(qword[tmp], vaddr);
 
     const auto fastmem_marker = ShouldFastmem(ctx, inst);
@@ -362,10 +362,10 @@ void AxxEmitX64::EmitExclusiveReadMemoryInline(AxxEmitContext& ctx, IR::Inst* in
         const auto location = EmitReadMemoryMov<bitsize>(code, value_idx, src_ptr, ordered);
 
         fastmem_patch_info.emplace(
-            mcl::bit_cast<u64>(location),
+            std::bit_cast<u64>(location),
             FastmemPatchInfo{
-                mcl::bit_cast<u64>(code.getCurr()),
-                mcl::bit_cast<u64>(wrapped_fn),
+                std::bit_cast<u64>(code.getCurr()),
+                std::bit_cast<u64>(wrapped_fn),
                 *fastmem_marker,
                 conf.recompile_on_exclusive_fastmem_failure,
             });
@@ -383,7 +383,7 @@ void AxxEmitX64::EmitExclusiveReadMemoryInline(AxxEmitContext& ctx, IR::Inst* in
         code.call(wrapped_fn);
     }
 
-    code.mov(tmp, mcl::bit_cast<u64>(GetExclusiveMonitorValuePointer(conf.global_monitor, conf.processor_id)));
+    code.mov(tmp, std::bit_cast<u64>(GetExclusiveMonitorValuePointer(conf.global_monitor, conf.processor_id)));
     EmitWriteMemoryMov<bitsize>(code, tmp, value_idx, false);
 
     EmitExclusiveUnlock(code, conf, tmp, tmp2.cvt32());
@@ -434,14 +434,14 @@ void AxxEmitX64::EmitExclusiveWriteMemoryInline(AxxEmitContext& ctx, IR::Inst* i
     code.movzx(tmp.cvt32(), code.byte[code.ABI_JIT_PTR + offsetof(AxxJitState, exclusive_state)]);
     code.test(tmp.cvt8(), tmp.cvt8());
     code.je(*end, code.T_NEAR);
-    code.mov(tmp, mcl::bit_cast<u64>(GetExclusiveMonitorAddressPointer(conf.global_monitor, conf.processor_id)));
+    code.mov(tmp, std::bit_cast<u64>(GetExclusiveMonitorAddressPointer(conf.global_monitor, conf.processor_id)));
     code.cmp(qword[tmp], vaddr);
     code.jne(*end, code.T_NEAR);
 
     EmitExclusiveTestAndClear(code, conf, vaddr, tmp, rax);
 
     code.mov(code.byte[code.ABI_JIT_PTR + offsetof(AxxJitState, exclusive_state)], u8(0));
-    code.mov(tmp, mcl::bit_cast<u64>(GetExclusiveMonitorValuePointer(conf.global_monitor, conf.processor_id)));
+    code.mov(tmp, std::bit_cast<u64>(GetExclusiveMonitorValuePointer(conf.global_monitor, conf.processor_id)));
 
     if constexpr (bitsize == 128) {
         code.mov(rax, qword[tmp + 0]);
@@ -499,10 +499,10 @@ void AxxEmitX64::EmitExclusiveWriteMemoryInline(AxxEmitContext& ctx, IR::Inst* i
             code.call(wrapped_fn);
 
             fastmem_patch_info.emplace(
-                mcl::bit_cast<u64>(location),
+                std::bit_cast<u64>(location),
                 FastmemPatchInfo{
-                    mcl::bit_cast<u64>(code.getCurr()),
-                    mcl::bit_cast<u64>(wrapped_fn),
+                    std::bit_cast<u64>(code.getCurr()),
+                    std::bit_cast<u64>(wrapped_fn),
                     *fastmem_marker,
                     conf.recompile_on_exclusive_fastmem_failure,
                 });

src/dynarmic/src/dynarmic/backend/x64/emit_x64_memory.h

@@ -1,9 +1,12 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 /* This file is part of the dynarmic project.
  * Copyright (c) 2022 MerryMage
  * SPDX-License-Identifier: 0BSD
  */
 
-#include <mcl/bit_cast.hpp>
+#include <bit>
 #include <xbyak/xbyak.h>
 
 #include "dynarmic/backend/x64/a32_emit_x64.h"
@@ -342,7 +345,7 @@ void EmitExclusiveLock(BlockOfCode& code, const UserConfig& conf, Xbyak::Reg64 p
         return;
     }
 
-    code.mov(pointer, mcl::bit_cast<u64>(GetExclusiveMonitorLockPointer(conf.global_monitor)));
+    code.mov(pointer, std::bit_cast<u64>(GetExclusiveMonitorLockPointer(conf.global_monitor)));
     EmitSpinLockLock(code, pointer, tmp);
 }
 
@@ -352,7 +355,7 @@ void EmitExclusiveUnlock(BlockOfCode& code, const UserConfig& conf, Xbyak::Reg64
         return;
     }
 
-    code.mov(pointer, mcl::bit_cast<u64>(GetExclusiveMonitorLockPointer(conf.global_monitor)));
+    code.mov(pointer, std::bit_cast<u64>(GetExclusiveMonitorLockPointer(conf.global_monitor)));
     EmitSpinLockUnlock(code, pointer, tmp);
 }
 
@@ -369,7 +372,7 @@ void EmitExclusiveTestAndClear(BlockOfCode& code, const UserConfig& conf, Xbyak:
             continue;
         }
         Xbyak::Label ok;
-        code.mov(pointer, mcl::bit_cast<u64>(GetExclusiveMonitorAddressPointer(conf.global_monitor, processor_index)));
+        code.mov(pointer, std::bit_cast<u64>(GetExclusiveMonitorAddressPointer(conf.global_monitor, processor_index)));
         code.cmp(qword[pointer], vaddr);
         code.jne(ok, code.T_NEAR);
         code.mov(qword[pointer], tmp);

src/dynarmic/src/dynarmic/backend/x64/exception_handler_windows.cpp

@@ -13,7 +13,7 @@
 #include <vector>
 
 #include "dynarmic/common/assert.h"
-#include <mcl/bit_cast.hpp>
+#include <bit>
 #include "dynarmic/common/common_types.h"
 
 #include "dynarmic/backend/exception_handler.h"
@@ -184,20 +184,20 @@ struct ExceptionHandler::Impl final {
         // Our 3rd argument is a PCONTEXT.
 
         // If not within our codeblock, ignore this exception.
-        code.mov(code.rax, Safe::Negate(mcl::bit_cast<u64>(code.getCode())));
+        code.mov(code.rax, Safe::Negate(std::bit_cast<u64>(code.getCode())));
         code.add(code.rax, code.qword[code.ABI_PARAM3 + Xbyak::RegExp(offsetof(CONTEXT, Rip))]);
         code.cmp(code.rax, static_cast<u32>(code.GetTotalCodeSize()));
         code.ja(exception_handler_without_cb);
 
         code.lea(code.rsp, code.ptr[code.rsp - 8]);
-        code.mov(code.ABI_PARAM1, mcl::bit_cast<u64>(&cb));
+        code.mov(code.ABI_PARAM1, std::bit_cast<u64>(&cb));
         code.mov(code.ABI_PARAM2, code.ABI_PARAM3);
         code.CallLambda(
             [](const std::function<FakeCall(u64)>& cb_, PCONTEXT ctx) {
                 FakeCall fc = cb_(ctx->Rip);
 
                 ctx->Rsp -= sizeof(u64);
-                *mcl::bit_cast<u64*>(ctx->Rsp) = fc.ret_rip;
+                *std::bit_cast<u64*>(ctx->Rsp) = fc.ret_rip;
                 ctx->Rip = fc.call_rip;
             });
         code.add(code.rsp, 8);

src/dynarmic/src/dynarmic/backend/x64/perf_map.h

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 /* This file is part of the dynarmic project.
  * Copyright (c) 2018 MerryMage
  * SPDX-License-Identifier: 0BSD
@@ -7,7 +10,7 @@
 
 #include <string_view>
 
-#include <mcl/bit_cast.hpp>
+#include <bit>
 
 namespace Dynarmic::Backend::X64 {
 
@@ -17,7 +20,7 @@ void PerfMapRegister(const void* start, const void* end, std::string_view friend
 
 template<typename T>
 void PerfMapRegister(T start, const void* end, std::string_view friendly_name) {
-    detail::PerfMapRegister(mcl::bit_cast<const void*>(start), end, friendly_name);
+    detail::PerfMapRegister(std::bit_cast<const void*>(start), end, friendly_name);
 }
 
 void PerfMapClear();

src/dynarmic/src/dynarmic/backend/x64/reg_alloc.cpp

@@ -15,7 +15,7 @@
 
 #include <fmt/ostream.h>
 #include "dynarmic/common/assert.h"
-#include <mcl/bit_cast.hpp>
+#include <bit>
 #include <xbyak/xbyak.h>
 
 #include "dynarmic/backend/x64/abi.h"

src/dynarmic/src/dynarmic/common/llvm_disassemble.cpp

@@ -16,7 +16,7 @@
 #endif
 
 #include "dynarmic/common/assert.h"
-#include <mcl/bit_cast.hpp>
+#include <bit>
 #include "dynarmic/common/common_types.h"
 
 #include "dynarmic/common/llvm_disassemble.h"
@@ -53,7 +53,7 @@ std::string DisassembleX64(const void* begin, const void* end) {
     LLVMDisasmDispose(llvm_ctx);
 #else
     result += fmt::format("(recompile with DYNARMIC_USE_LLVM=ON to disassemble the generated x86_64 code)\n");
-    result += fmt::format("start: {:016x}, end: {:016x}\n", mcl::bit_cast<u64>(begin), mcl::bit_cast<u64>(end));
+    result += fmt::format("start: {:016x}, end: {:016x}\n", std::bit_cast<u64>(begin), std::bit_cast<u64>(end));
 #endif
 
     return result;

src/dynarmic/src/dynarmic/ir/ir_emitter.h

@@ -2931,19 +2931,19 @@ public:
     }
 
     void CallHostFunction(void (*fn)(void)) {
-        Inst(Opcode::CallHostFunction, Imm64(mcl::bit_cast<u64>(fn)), Value{}, Value{}, Value{});
+        Inst(Opcode::CallHostFunction, Imm64(std::bit_cast<u64>(fn)), Value{}, Value{}, Value{});
     }
 
     void CallHostFunction(void (*fn)(u64), const U64& arg1) {
-        Inst(Opcode::CallHostFunction, Imm64(mcl::bit_cast<u64>(fn)), arg1, Value{}, Value{});
+        Inst(Opcode::CallHostFunction, Imm64(std::bit_cast<u64>(fn)), arg1, Value{}, Value{});
     }
 
     void CallHostFunction(void (*fn)(u64, u64), const U64& arg1, const U64& arg2) {
-        Inst(Opcode::CallHostFunction, Imm64(mcl::bit_cast<u64>(fn)), arg1, arg2, Value{});
+        Inst(Opcode::CallHostFunction, Imm64(std::bit_cast<u64>(fn)), arg1, arg2, Value{});
     }
 
     void CallHostFunction(void (*fn)(u64, u64, u64), const U64& arg1, const U64& arg2, const U64& arg3) {
-        Inst(Opcode::CallHostFunction, Imm64(mcl::bit_cast<u64>(fn)), arg1, arg2, arg3);
+        Inst(Opcode::CallHostFunction, Imm64(std::bit_cast<u64>(fn)), arg1, arg2, arg3);
     }
 
     void SetTerm(const Terminal& terminal) {