Index: lib/Object/ELFYAML.cpp
===================================================================
--- lib/Object/ELFYAML.cpp
+++ lib/Object/ELFYAML.cpp
@@ -193,6 +193,7 @@
   ECase(EM_VIDEOCORE5)
   ECase(EM_78KOR)
   ECase(EM_56800EX)
+  ECase(EM_AMDGPU)
 #undef ECase
 }
 
Index: test/Object/AMDGPU/elf-definitios.yaml
===================================================================
--- /dev/null
+++ test/Object/AMDGPU/elf-definitios.yaml
@@ -0,0 +1,12 @@
+# RUN: yaml2obj -format=elf %s > %t.o
+# RUN: llvm-readobj -file-headers %t.o | FileCheck %s
+
+# CHECK:  Machine: EM_AMDGPU (0xE0)
+
+---
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_REL
+  Machine: EM_AMDGPU
+...