1 files changed, 13 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp b/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
index 69ad7d7b6b3..87b2b055ab2 100644
--- a/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
+++ b/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
@@ -107,6 +107,11 @@ public:
 
   bool MayNeedRelaxation(const MCInst &Inst) const;
 
+  bool fixupNeedsRelaxation(const MCFixup &Fixup,
+                            uint64_t Value,
+                            const MCInstFragment *DF,
+                            const MCAsmLayout &Layout) const;
+
   void RelaxInstruction(const MCInst &Inst, MCInst &Res) const;
 
   bool WriteNopData(uint64_t Count, MCObjectWriter *OW) const;
@@ -244,6 +249,14 @@ bool X86AsmBackend::MayNeedRelaxation(const MCInst &Inst) const {
   return hasExp && !hasRIP;
 }
 
+bool X86AsmBackend::fixupNeedsRelaxation(const MCFixup &Fixup,
+                                         uint64_t Value,
+                                         const MCInstFragment *DF,
+                                         const MCAsmLayout &Layout) const {
+  // Relax if the value is too big for a (signed) i8.
+  return int64_t(Value) != int64_t(int8_t(Value));
+}
+
 // FIXME: Can tblgen help at all here to verify there aren't other instructions
 // we can relax?
 void X86AsmBackend::RelaxInstruction(const MCInst &Inst, MCInst &Res) const {