[Orc] Slightly improve the x86-64 resolver block machine code.

Replace leaq + movq of a pointer with a single movabsq.

llvm-svn: 259968

1 files changed, 7 insertions, 8 deletions

diff --git a/llvm/lib/ExecutionEngine/Orc/OrcArchitectureSupport.cpp b/llvm/lib/ExecutionEngine/Orc/OrcArchitectureSupport.cpp
index 054fdadc800..606b5616f59 100644
--- a/llvm/lib/ExecutionEngine/Orc/OrcArchitectureSupport.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/OrcArchitectureSupport.cpp
@@ -38,11 +38,14 @@ void OrcX86_64::writeResolverCode(uint8_t *ResolverMem, JITReentryFn ReentryFn,
     0x41, 0x57,                                // 0x18: pushq     %r15
     0x48, 0x81, 0xec, 0x08, 0x02, 0x00, 0x00,  // 0x1a: subq      0x208, %rsp
     0x48, 0x0f, 0xae, 0x04, 0x24,              // 0x21: fxsave64  (%rsp)
-    0x48, 0x8d, 0x3d, 0x43, 0x00, 0x00, 0x00,  // 0x26: leaq      67(%rip), %rdi
-    0x48, 0x8b, 0x3f,                          // 0x2d: movq      (%rdi), %rdi
+    0x48, 0xbf,                                // 0x26: movabsq   <CBMgr>, %rdi
+
+    // 0x28: Callback manager addr.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
     0x48, 0x8b, 0x75, 0x08,                    // 0x30: movq      8(%rbp), %rsi
     0x48, 0x83, 0xee, 0x06,                    // 0x34: subq      $6, %rsi
-    0x48, 0xb8,                                // 0x38: movabsq   $0, %rax
+    0x48, 0xb8,                                // 0x38: movabsq   <REntry>, %rax
 
     // 0x3a: JIT re-entry fn addr:
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -67,14 +70,10 @@ void OrcX86_64::writeResolverCode(uint8_t *ResolverMem, JITReentryFn ReentryFn,
     0x58,                                      // 0x69: popq      %rax
     0x5d,                                      // 0x6a: popq      %rbp
     0xc3,                                      // 0x6b: retq
-    0x00, 0x00, 0x00, 0x00,                    // 0x6c: <padding>
-
-    // 0x70: Callback mgr address.
-    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   };
 
   const unsigned ReentryFnAddrOffset = 0x3a;
-  const unsigned CallbackMgrAddrOffset = 0x70;
+  const unsigned CallbackMgrAddrOffset = 0x28;
   
   memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode));
   memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn));