From 367a0bb672807927e22aadac9d4fa8c96c3b922e Mon Sep 17 00:00:00 2001
From: MerryMage <MerryMage@users.noreply.github.com>
Date: Mon, 15 Oct 2018 21:00:48 +0100
Subject: [PATCH] JitRegCache: Add RCOpArg::ExtractWithByteOffset

---
 .../Core/PowerPC/Jit64/RegCache/JitRegCache.cpp     | 13 +++++++++++++
 .../Core/Core/PowerPC/Jit64/RegCache/JitRegCache.h  |  3 +++
 2 files changed, 16 insertions(+)

diff --git a/Source/Core/Core/PowerPC/Jit64/RegCache/JitRegCache.cpp b/Source/Core/Core/PowerPC/Jit64/RegCache/JitRegCache.cpp
index 94aad4e9e1..4add2997a5 100644
--- a/Source/Core/Core/PowerPC/Jit64/RegCache/JitRegCache.cpp
+++ b/Source/Core/Core/PowerPC/Jit64/RegCache/JitRegCache.cpp
@@ -110,6 +110,19 @@ OpArg RCOpArg::Location() const
   return {};
 }
 
+OpArg RCOpArg::ExtractWithByteOffset(int offset)
+{
+  if (offset == 0)
+    return Location();
+
+  ASSERT(rc);
+  const preg_t preg = std::get<preg_t>(contents);
+  rc->StoreFromRegister(preg, RegCache::FlushMode::MaintainState);
+  OpArg result = rc->GetDefaultLocation(preg);
+  result.AddMemOffset(offset);
+  return result;
+}
+
 void RCOpArg::Unlock()
 {
   if (const preg_t* preg = std::get_if<preg_t>(&contents))
diff --git a/Source/Core/Core/PowerPC/Jit64/RegCache/JitRegCache.h b/Source/Core/Core/PowerPC/Jit64/RegCache/JitRegCache.h
index adf8eaa438..0499bc070c 100644
--- a/Source/Core/Core/PowerPC/Jit64/RegCache/JitRegCache.h
+++ b/Source/Core/Core/PowerPC/Jit64/RegCache/JitRegCache.h
@@ -47,6 +47,9 @@ public:
   bool IsSimpleReg(Gen::X64Reg reg) const { return Location().IsSimpleReg(reg); }
   Gen::X64Reg GetSimpleReg() const { return Location().GetSimpleReg(); }
 
+  // Use to extract bytes from a register using the regcache. offset is in bytes.
+  Gen::OpArg ExtractWithByteOffset(int offset);
+
   void Unlock();
 
   bool IsImm() const;