From 8510dc086ea828f08b1d58813130e62a14eedc0b Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 14 Mar 2007 10:48:08 +0000
Subject: [PATCH] x86-64 JIT stub codegen.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35096 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86JITInfo.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/Target/X86/X86JITInfo.cpp b/lib/Target/X86/X86JITInfo.cpp
index b32fab21db0..3fb3da788db 100644
--- a/lib/Target/X86/X86JITInfo.cpp
+++ b/lib/Target/X86/X86JITInfo.cpp
@@ -306,10 +306,21 @@ void *X86JITInfo::emitFunctionStub(void *Fn, MachineCodeEmitter &MCE) {
   bool NotCC = Fn != (void*)(intptr_t)X86CompilationCallback;
 #endif
   if (NotCC) {
+#ifdef __x86_64__
+    MCE.startFunctionStub(13, 4);
+    MCE.emitByte(0x49);          // REX prefix
+    MCE.emitByte(0xB8+2);        // movabsq r10
+    MCE.emitWordLE(((unsigned *)&Fn)[0]);
+    MCE.emitWordLE(((unsigned *)&Fn)[1]);
+    MCE.emitByte(0x41);          // REX prefix
+    MCE.emitByte(0xFF);          // jmpq *r10
+    MCE.emitByte(2 | (4 << 3) | (3 << 6));
+#else
     MCE.startFunctionStub(5, 4);
     MCE.emitByte(0xE9);
     MCE.emitWordLE((intptr_t)Fn-MCE.getCurrentPCValue()-4);
     return MCE.finishFunctionStub(0);
+#endif
   }
 
 #ifdef __x86_64__