1 files changed, 7 insertions, 1 deletions
diff --git a/lib/Target/R600/SIShrinkInstructions.cpp b/lib/Target/R600/SIShrinkInstructions.cpp
index 97bbd78..51e72cd 100644
--- a/lib/Target/R600/SIShrinkInstructions.cpp
+++ b/lib/Target/R600/SIShrinkInstructions.cpp
@@ -18,9 +18,10 @@
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/IR/Constants.h"
-#include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Function.h"
+#include "llvm/IR/LLVMContext.h"
 #include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetMachine.h"
 
 #define DEBUG_TYPE "si-shrink-instructions"
@@ -88,6 +89,11 @@ static bool canShrink(MachineInstr &MI, const SIInstrInfo *TII,
 
   const MachineOperand *Src2 = TII->getNamedOperand(MI, AMDGPU::OpName::src2);
   // Can't shrink instruction with three operands.
+  // FIXME: v_cndmask_b32 has 3 operands and is shrinkable, but we need to add
+  // a special case for it.  It can only be shrunk if the third operand
+  // is vcc.  We should handle this the same way we handle vopc, by addding
+  // a register allocation hint pre-regalloc and then do the shrining
+  // post-regalloc.
   if (Src2)
     return false;