Index: llvm/docs/Extensions.rst
===================================================================
--- llvm/docs/Extensions.rst
+++ llvm/docs/Extensions.rst
@@ -207,6 +207,17 @@
 Target Specific Behaviour
 =========================
 
+X86
+---
+
+Relocations
+^^^^^^^^^^^
+
+``@ABS8`` can be applied to symbols which appear as immediate operands to
+instructions that have a 8-bit immediate form for that operand. It causes
+the assembler to use the 8-bit form and an 8-bit relocation (e.g. ``R_386_8``
+or ``R_X86_64_8``) for the symbol.
+
 Windows on ARM
 --------------
 
Index: llvm/include/llvm/MC/MCExpr.h
===================================================================
--- llvm/include/llvm/MC/MCExpr.h
+++ llvm/include/llvm/MC/MCExpr.h
@@ -190,6 +190,7 @@
     VK_SECREL,
     VK_SIZE,      // symbol@SIZE
     VK_WEAKREF,   // The link between the symbols in .weakref foo, bar
+    VK_ABS8,
 
     VK_ARM_NONE,
     VK_ARM_GOT_PREL,
Index: llvm/lib/MC/MCAssembler.cpp
===================================================================
--- llvm/lib/MC/MCAssembler.cpp
+++ llvm/lib/MC/MCAssembler.cpp
@@ -741,6 +741,10 @@
   MCValue Target;
   uint64_t Value;
   bool Resolved = evaluateFixup(Layout, Fixup, DF, Target, Value);
+  if (Target.getSymA() &&
+      Target.getSymA()->getKind() == MCSymbolRefExpr::VK_ABS8 &&
+      Fixup.getKind() == FK_Data_1)
+    return false;
   return getBackend().fixupNeedsRelaxationAdvanced(Fixup, Resolved, Value, DF,
                                                    Layout);
 }
Index: llvm/lib/MC/MCExpr.cpp
===================================================================
--- llvm/lib/MC/MCExpr.cpp
+++ llvm/lib/MC/MCExpr.cpp
@@ -205,6 +205,7 @@
   case VK_SECREL: return "SECREL32";
   case VK_SIZE: return "SIZE";
   case VK_WEAKREF: return "WEAKREF";
+  case VK_ABS8: return "ABS8";
   case VK_ARM_NONE: return "none";
   case VK_ARM_GOT_PREL: return "GOT_PREL";
   case VK_ARM_TARGET1: return "target1";
@@ -314,6 +315,7 @@
     .Case("imgrel", VK_COFF_IMGREL32)
     .Case("secrel32", VK_SECREL)
     .Case("size", VK_SIZE)
+    .Case("abs8", VK_ABS8)
     .Case("l", VK_PPC_LO)
     .Case("h", VK_PPC_HI)
     .Case("ha", VK_PPC_HA)
Index: llvm/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp
===================================================================
--- llvm/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp
+++ llvm/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp
@@ -96,6 +96,7 @@
   default:
     llvm_unreachable("Unimplemented");
   case MCSymbolRefExpr::VK_None:
+  case MCSymbolRefExpr::VK_ABS8:
     switch (Type) {
     case RT64_64:
       return IsPCRel ? ELF::R_X86_64_PC64 : ELF::R_X86_64_64;
@@ -219,6 +220,7 @@
   default:
     llvm_unreachable("Unimplemented");
   case MCSymbolRefExpr::VK_None:
+  case MCSymbolRefExpr::VK_ABS8:
     switch (Type) {
     case RT32_32:
       return IsPCRel ? ELF::R_386_PC32 : ELF::R_386_32;
Index: llvm/test/MC/X86/abs8.s
===================================================================
--- /dev/null
+++ llvm/test/MC/X86/abs8.s
@@ -0,0 +1,8 @@
+// RUN: llvm-mc -filetype=obj %s -o - -triple i686-pc-linux | llvm-objdump -d -r - | FileCheck --check-prefix=32 %s
+// RUN: llvm-mc -filetype=obj %s -o - -triple x86_64-pc-linux | llvm-objdump -d -r - | FileCheck --check-prefix=64 %s
+
+// 32: 0: 83 ff 00  cmpl $0, %edi
+// 32:   00000002:  R_386_8 foo
+// 64: 0: 83 ff 00  cmpl $0, %edi
+// 64:  0000000000000002:  R_X86_64_8 foo+0
+cmp $foo@ABS8, %edi