1 files changed, 10 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrFormats.td b/lib/Target/X86/X86InstrFormats.td
index c2fe786732dcd..bfcbf71d252f3 100644
--- a/lib/Target/X86/X86InstrFormats.td
+++ b/lib/Target/X86/X86InstrFormats.td
@@ -225,6 +225,12 @@ class Has3DNow0F0FOpcode  { bit has3DNow0F0FOpcode = 1; }
 class XOP { Encoding OpEnc = EncXOP; }
 class XOP_4V : XOP { bit hasVEX_4V = 1; }
 
+// Specify the alternative register form instruction to replace the current
+// instruction in case it was picked during generation of memory folding tables
+class FoldGenData<string _RegisterForm> {
+    string FoldGenRegForm = _RegisterForm;
+}
+
 class X86Inst<bits<8> opcod, Format f, ImmType i, dag outs, dag ins,
               string AsmStr,
               InstrItinClass itin,
@@ -304,6 +310,10 @@ class X86Inst<bits<8> opcod, Format f, ImmType i, dag outs, dag ins,
                                      CD8_EltSize,
                                      !srl(VectSize, CD8_Form{1-0}))), 0);
 
+  // Used in the memory folding generation (TableGen backend) to point to an alternative
+  // instruction to replace the current one in case it got picked during generation.
+  string FoldGenRegForm = ?;
+
   // TSFlags layout should be kept in sync with X86BaseInfo.h.
   let TSFlags{6-0}   = FormBits;
   let TSFlags{8-7}   = OpSizeBits;