Hooks for predication support.

llvm-svn: 37093

1 files changed, 22 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/ARMInstrInfo.cpp b/llvm/lib/Target/ARM/ARMInstrInfo.cpp
index 3f501a68ae1..de9ea48b265 100644
--- a/llvm/lib/Target/ARM/ARMInstrInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMInstrInfo.cpp
@@ -423,6 +423,28 @@ ReverseBranchCondition(std::vector<MachineOperand> &Cond) const {
   return false;
 }
 
+bool ARMInstrInfo::isPredicatable(MachineInstr *MI) const {
+  const TargetInstrDescriptor *TID = MI->getInstrDescriptor();
+  if (TID->Flags & M_PREDICATED)
+    return true;
+
+  unsigned Opc = MI->getOpcode();
+  return Opc == ARM::B || Opc == ARM::tB;
+}
+
+void ARMInstrInfo::PredicateInstruction(MachineInstr *MI,
+                                      std::vector<MachineOperand> &Cond) const {
+  unsigned Opc = MI->getOpcode();
+  if (Opc == ARM::B || Opc == ARM::tB) {
+    MI->setInstrDescriptor(get(Opc == ARM::B ? ARM::Bcc : ARM::tBcc));
+    MI->addImmOperand(Cond[0].getImmedValue());
+    return;
+  }
+
+  MachineOperand *PMO = MI->findFirstPredOperand();
+  PMO->setImm(Cond[0].getImmedValue());
+}
+
 
 /// FIXME: Works around a gcc miscompilation with -fstrict-aliasing
 static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT,