Modernize `std::fill` with ranges

In DSPCore.cpp, there were two `std::fill` uses that could be simplified using `std::fill_n`. Due to their proximity with other `std::fill` algorithms being modernized with ranges, I chose to make these examples into the rare `std::ranges::fill_n`.

Source/Core/Core/DSP/DSPCore.cpp

@@ -143,20 +143,20 @@ bool SDSP::Initialize(const DSPInitOptions& opts)
 
   std::memset(&r, 0, sizeof(r));
 
-  std::fill(std::begin(reg_stack_ptrs), std::end(reg_stack_ptrs), 0);
+  std::ranges::fill(reg_stack_ptrs, 0);
 
   for (auto& stack : reg_stacks)
-    std::fill(std::begin(stack), std::end(stack), 0);
+    std::ranges::fill(stack, 0);
 
   // Fill IRAM with HALT opcodes.
-  std::fill(iram, iram + DSP_IRAM_SIZE, 0x0021);
+  std::ranges::fill_n(iram, DSP_IRAM_SIZE, 0x0021);
 
   // Just zero out DRAM.
-  std::fill(dram, dram + DSP_DRAM_SIZE, 0);
+  std::ranges::fill_n(dram, DSP_DRAM_SIZE, 0);
 
   // Copied from a real console after the custom UCode has been loaded.
   // These are the indexing wrapping registers.
-  std::fill(std::begin(r.wr), std::end(r.wr), 0xffff);
+  std::ranges::fill(r.wr, 0xffff);
 
   r.sr |= SR_INT_ENABLE;
   r.sr |= SR_EXT_INT_ENABLE;
@@ -172,7 +172,7 @@ bool SDSP::Initialize(const DSPInitOptions& opts)
 void SDSP::Reset()
 {
   pc = DSP_RESET_VECTOR;
-  std::fill(std::begin(r.wr), std::end(r.wr), 0xffff);
+  std::ranges::fill(r.wr, 0xffff);
 }
 
 void SDSP::Shutdown()

Source/Core/Core/DSP/Jit/x64/DSPEmitter.cpp

@@ -40,7 +40,7 @@ DSPEmitter::DSPEmitter(DSPCore& dsp)
   m_stub_entry_point = CompileStub();
 
   // Clear all of the block references
-  std::fill(m_blocks.begin(), m_blocks.end(), (DSPCompiledCode)m_stub_entry_point);
+  std::ranges::fill(m_blocks, (DSPCompiledCode)m_stub_entry_point);
 }
 
 DSPEmitter::~DSPEmitter()

Source/Core/Core/FifoPlayer/FifoRecorder.cpp

@@ -240,8 +240,8 @@ void FifoRecorder::StartRecording(s32 numFrames, CallbackFunc finishedCb)
   m_Ram.resize(memory.GetRamSize());
   m_ExRam.resize(memory.GetExRamSize());
 
-  std::fill(m_Ram.begin(), m_Ram.end(), 0);
-  std::fill(m_ExRam.begin(), m_ExRam.end(), 0);
+  std::ranges::fill(m_Ram, 0);
+  std::ranges::fill(m_ExRam, 0);
 
   m_File->SetIsWii(m_system.IsWii());
 

Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp

@@ -452,7 +452,7 @@ bool Wiimote::ProcessReadDataRequest()
   reply.address = Common::swap16(m_read_request.address);
 
   // Pre-fill with zeros in case of read-error or read < 16-bytes:
-  std::fill(std::begin(reply.data), std::end(reply.data), 0x00);
+  std::ranges::fill(reply.data, 0x00);
 
   ErrorCode error_code = ErrorCode::Success;
 

Source/Core/Core/PowerPC/PPCCache.cpp

@@ -100,9 +100,9 @@ void Cache::Reset()
   valid.fill(0);
   plru.fill(0);
   modified.fill(0);
-  std::fill(lookup_table.begin(), lookup_table.end(), 0xFF);
-  std::fill(lookup_table_ex.begin(), lookup_table_ex.end(), 0xFF);
-  std::fill(lookup_table_vmem.begin(), lookup_table_vmem.end(), 0xFF);
+  std::ranges::fill(lookup_table, 0xFF);
+  std::ranges::fill(lookup_table_ex, 0xFF);
+  std::ranges::fill(lookup_table_vmem, 0xFF);
 }
 
 void InstructionCache::Reset(JitInterface& jit_interface)

Source/Core/Core/PowerPC/PowerPC.cpp

@@ -128,10 +128,10 @@ void PowerPCManager::DoState(PointerWrap& p)
 
 void PowerPCManager::ResetRegisters()
 {
-  std::fill(std::begin(m_ppc_state.ps), std::end(m_ppc_state.ps), PairedSingle{});
-  std::fill(std::begin(m_ppc_state.sr), std::end(m_ppc_state.sr), 0U);
-  std::fill(std::begin(m_ppc_state.gpr), std::end(m_ppc_state.gpr), 0U);
-  std::fill(std::begin(m_ppc_state.spr), std::end(m_ppc_state.spr), 0U);
+  std::ranges::fill(m_ppc_state.ps, PairedSingle{});
+  std::ranges::fill(m_ppc_state.sr, 0U);
+  std::ranges::fill(m_ppc_state.gpr, 0U);
+  std::ranges::fill(m_ppc_state.spr, 0U);
 
   // Gamecube:
   // 0x00080200 = lonestar 2.0

Source/Core/InputCommon/ControllerInterface/DInput/DInputJoystick.cpp

@@ -183,7 +183,7 @@ Joystick::Joystick(const LPDIRECTINPUTDEVICE8 device) : m_device(device)
 
   // Set hats to center:
   // "The center position is normally reported as -1" -MSDN
-  std::fill(std::begin(m_state_in.rgdwPOV), std::end(m_state_in.rgdwPOV), -1);
+  std::ranges::fill(m_state_in.rgdwPOV, -1);
 }
 
 Joystick::~Joystick()

Source/Core/VideoCommon/FramebufferManager.cpp

@@ -764,9 +764,9 @@ bool FramebufferManager::CreateReadbackFramebuffer()
   }
 
   m_efb_color_cache.tiles.resize(total_tiles);
-  std::fill(m_efb_color_cache.tiles.begin(), m_efb_color_cache.tiles.end(), EFBCacheTile{false, 0});
+  std::ranges::fill(m_efb_color_cache.tiles, EFBCacheTile{false, 0});
   m_efb_depth_cache.tiles.resize(total_tiles);
-  std::fill(m_efb_depth_cache.tiles.begin(), m_efb_depth_cache.tiles.end(), EFBCacheTile{false, 0});
+  std::ranges::fill(m_efb_depth_cache.tiles, EFBCacheTile{false, 0});
 
   return true;
 }