Index: lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp
===================================================================
--- lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp
+++ lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp
@@ -96,7 +96,7 @@
 
   switch ((unsigned)Fixup.getKind()) {
     case AMDGPU::fixup_si_sopp_br: {
-      int64_t BrImm = (Value - 4) / 4;
+      int64_t BrImm = ((int64_t)Value - 4) / 4;
       if (!isInt<16>(BrImm))
         report_fatal_error("branch size exceeds simm16");