[llvm-commits] [llvm] r155896 - /llvm/trunk/lib/Target/X86/X86CodeEmitter.cpp

[Craig Topper]

Author: ctopper
Date: Tue May  1 01:34:01 2012
New Revision: 155896

URL: http://llvm.org/viewvc/llvm-project?rev=155896&view=rev
Log:
Attempt to handle MRMInitReg in emitVEXOpcodePrefix. Hopefully fixes PR12711.

Modified:
    llvm/trunk/lib/Target/X86/X86CodeEmitter.cpp

Modified: llvm/trunk/lib/Target/X86/X86CodeEmitter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86CodeEmitter.cpp?rev=155896&r1=155895&r2=155896&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86CodeEmitter.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86CodeEmitter.cpp Tue May  1 01:34:01 2012
@@ -939,7 +939,18 @@
   // Classify VEX_B, VEX_4V, VEX_R, VEX_X
   unsigned CurOp = 0;
   switch (TSFlags & X86II::FormMask) {
-    case X86II::MRMInitReg: llvm_unreachable("FIXME: Remove this!");
+    case X86II::MRMInitReg:
+      // Duplicate register.
+      if (X86II::isX86_64ExtendedReg(MI.getOperand(CurOp).getReg()))
+        VEX_R = 0x0;
+
+      if (HasVEX_4V)
+        VEX_4V = getVEXRegisterEncoding(MI, CurOp);
+      if (X86II::isX86_64ExtendedReg(MI.getOperand(CurOp).getReg()))
+        VEX_B = 0x0;
+      if (HasVEX_4VOp3)
+        VEX_4V = getVEXRegisterEncoding(MI, CurOp);
+      break;
     case X86II::MRMDestMem: {
       // MRMDestMem instructions forms:
       //  MemAddr, src1(ModR/M)