Add support for the arm 'y' asm modifier.

[oota-llvm.git] / lib / Target / ARM / ARMAsmPrinter.cpp

diff --git a/lib/Target/ARM/ARMAsmPrinter.cpp b/lib/Target/ARM/ARMAsmPrinter.cpp
index ff8f8a8a8e0f101498a3c2d7c1f679a0cebf2f0f..680680b2406dc5cbd1314eb949377749739bae67 100644 (file)
--- a/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -404,6 +404,18 @@ bool ARMAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNum,
     case 'q': // Print a NEON quad precision register.
       printOperand(MI, OpNum, O);
       return false;
+    case 'y': // Print a VFP single precision register as indexed double.
+      // This uses the ordering of the alias table to get the first 'd' register
+      // that overlaps the 's' register. Also, s0 is an odd register, hence the
+      // odd modulus check below.
+      if (MI->getOperand(OpNum).isReg()) {
+        unsigned Reg = MI->getOperand(OpNum).getReg();
+        const TargetRegisterInfo *TRI = MF->getTarget().getRegisterInfo();
+        O << ARMInstPrinter::getRegisterName(TRI->getAliasSet(Reg)[0]) <<
+        (((Reg % 2) == 1) ? "[0]" : "[1]");
+        return false;
+      }
+      // Fallthrough to unsupported.
     case 'Q':
     case 'R':
     case 'H':