[Hexagon] Use constant extenders to fix up hardware loops

Use a loop instruction with a constant extender for a hardware
loop instruction that is too far away from the start of the loop.
This is cheaper than changing the SA register value.

Differential Revision: http://reviews.llvm.org/D9262

llvm-svn: 235882

2 files changed, 15 insertions, 0 deletions

diff --git a/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonInstPrinter.cpp b/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonInstPrinter.cpp
index e19910ed32f..15cda717cf1 100644
--- a/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonInstPrinter.cpp
+++ b/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonInstPrinter.cpp
@@ -249,3 +249,17 @@ void HexagonInstPrinter::printSymbol(const MCInst *MI, unsigned OpNo,
   printOperand(MI, OpNo, O);
   O << ')';
 }
+
+void HexagonInstPrinter::printExtBrtarget(const MCInst *MI, unsigned OpNo,
+                                          raw_ostream &O) const {
+  const MCOperand &MO = MI->getOperand(OpNo);
+  const MCInstrDesc &MII = getMII().get(MI->getOpcode());
+
+  assert((isExtendable(MII.TSFlags) || isExtended(MII.TSFlags)) &&
+         "Expecting an extendable operand");
+
+  if (MO.isExpr() || isExtended(MII.TSFlags)) {
+    O << "##";
+  }
+  printOperand(MI, OpNo, O);
+}
diff --git a/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonInstPrinter.h b/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonInstPrinter.h
index e9a548fa2b0..3fedaed8fbf 100644
--- a/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonInstPrinter.h
+++ b/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonInstPrinter.h
@@ -56,6 +56,7 @@ namespace llvm {
     void printGlobalOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O)
            const;
     void printJumpTable(const MCInst *MI, unsigned OpNo, raw_ostream &O) const;
+    void printExtBrtarget(const MCInst *MI, unsigned OpNo, raw_ostream &O) const;
 
     void printConstantPool(const MCInst *MI, unsigned OpNo,
                            raw_ostream &O) const;