Index: include/llvm/MC/MCExpr.h
===================================================================
--- include/llvm/MC/MCExpr.h
+++ include/llvm/MC/MCExpr.h
@@ -286,6 +286,7 @@
     VK_AMDGPU_GOTPCREL32_HI, // symbol@gotpcrel32@hi
     VK_AMDGPU_REL32_LO,      // symbol@rel32@lo
     VK_AMDGPU_REL32_HI,      // symbol@rel32@hi
+    VK_AMDGPU_REL64,         // symbol@rel64
 
     VK_TPREL,
     VK_DTPREL
Index: lib/MC/MCExpr.cpp
===================================================================
--- lib/MC/MCExpr.cpp
+++ lib/MC/MCExpr.cpp
@@ -303,6 +303,7 @@
   case VK_AMDGPU_GOTPCREL32_HI: return "gotpcrel32@hi";
   case VK_AMDGPU_REL32_LO: return "rel32@lo";
   case VK_AMDGPU_REL32_HI: return "rel32@hi";
+  case VK_AMDGPU_REL64: return "rel64";
   }
   llvm_unreachable("Invalid variant kind");
 }
@@ -410,6 +411,7 @@
     .Case("gotpcrel32@hi", VK_AMDGPU_GOTPCREL32_HI)
     .Case("rel32@lo", VK_AMDGPU_REL32_LO)
     .Case("rel32@hi", VK_AMDGPU_REL32_HI)
+    .Case("rel64", VK_AMDGPU_REL64)
     .Default(VK_Invalid);
 }
 
Index: lib/Target/AMDGPU/MCTargetDesc/AMDGPUELFObjectWriter.cpp
===================================================================
--- lib/Target/AMDGPU/MCTargetDesc/AMDGPUELFObjectWriter.cpp
+++ lib/Target/AMDGPU/MCTargetDesc/AMDGPUELFObjectWriter.cpp
@@ -66,6 +66,8 @@
     return ELF::R_AMDGPU_REL32_LO;
   case MCSymbolRefExpr::VK_AMDGPU_REL32_HI:
     return ELF::R_AMDGPU_REL32_HI;
+  case MCSymbolRefExpr::VK_AMDGPU_REL64:
+    return ELF::R_AMDGPU_REL64;
   }
 
   switch (Fixup.getKind()) {
Index: test/MC/AMDGPU/reloc.s
===================================================================
--- test/MC/AMDGPU/reloc.s
+++ test/MC/AMDGPU/reloc.s
@@ -13,6 +13,7 @@
 // CHECK: }
 // CHECK: .rel.data {
 // CHECK: R_AMDGPU_ABS64 temp 0x0
+// CHECK: R_AMDGPU_REL64 temp 0x0
 // CHECK: }
 // CHECK: ]
 
@@ -36,12 +37,15 @@
 .section nonalloc, "w", @progbits
   .long var, common_var
 
-
 // 8 byte relocations
 	.type	ptr,@object
 	.data
 	.globl	ptr
+	.globl	foo
 	.p2align	3
 ptr:
 	.quad	temp
 	.size	ptr, 8
+foo:
+	.quad	temp@rel64
+	.size	foo, 8