[llvm-commits] [llvm] r75198 - in /llvm/trunk/lib/Target/ARM: ARMInstrThumb.td AsmPrinter/ARMAsmPrinter.cpp

[Evan Cheng]

Author: evancheng
Date: Thu Jul  9 18:43:36 2009
New Revision: 75198

URL: http://llvm.org/viewvc/llvm-project?rev=75198&view=rev
Log:
Added Thumb IT instruction.

Modified:
    llvm/trunk/lib/Target/ARM/ARMInstrThumb.td
    llvm/trunk/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp

Modified: llvm/trunk/lib/Target/ARM/ARMInstrThumb.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMInstrThumb.td?rev=75198&r1=75197&r2=75198&view=diff

==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMInstrThumb.td (original)
+++ llvm/trunk/lib/Target/ARM/ARMInstrThumb.td Thu Jul  9 18:43:36 2009
@@ -66,6 +66,11 @@
   return CurDAG->getTargetConstant(V, MVT::i32);
 }]>;
 
+// IT block condition mask
+def it_mask : Operand<i32> {
+  let PrintMethod = "printThumbITMask";
+}
+
 // Define Thumb specific addressing modes.
 
 // t_addrmode_rr := reg + reg
@@ -207,6 +212,10 @@
   def tBcc : T1I<(outs), (ins brtarget:$target, pred:$cc), "b$cc $target",
                  [/*(ARMbrcond bb:$target, imm:$cc)*/]>;
 
+// IT block
+def tIT : TI<(outs), (ins pred:$cc, it_mask:$mask),
+             "it$mask $cc", []>;
+
 //===----------------------------------------------------------------------===//
 //  Load Store Instructions.
 //

Modified: llvm/trunk/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp?rev=75198&r1=75197&r2=75198&view=diff

==============================================================================
--- llvm/trunk/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp (original)
+++ llvm/trunk/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp Thu Jul  9 18:43:36 2009
@@ -111,6 +111,7 @@
                                 const char *Modifier = 0);
     void printBitfieldInvMaskImmOperand (const MachineInstr *MI, int OpNum);
 
+    void printThumbITMask(const MachineInstr *MI, int OpNum);
     void printThumbAddrModeRROperand(const MachineInstr *MI, int OpNum);
     void printThumbAddrModeRI5Operand(const MachineInstr *MI, int OpNum,
                                       unsigned Scale);
@@ -636,6 +637,21 @@
 //===--------------------------------------------------------------------===//
 
 void
+ARMAsmPrinter::printThumbITMask(const MachineInstr *MI, int Op) {
+  // (3 - the number of trailing zeros) is the number of then / else.
+  unsigned Mask = MI->getOperand(Op).getImm();
+  unsigned NumTZ = CountTrailingZeros_32(Mask);
+  assert(NumTZ <= 3 && "Invalid IT mask!");
+  for (unsigned Pos = 3, e = NumTZ; Pos >= e; --Pos) {
+    bool T = (Mask & (1 << Pos)) != 0;
+    if (T)
+      O << 't';
+    else
+      O << 'e';
+  }
+}
+
+void
 ARMAsmPrinter::printThumbAddrModeRROperand(const MachineInstr *MI, int Op) {
   const MachineOperand &MO1 = MI->getOperand(Op);
   const MachineOperand &MO2 = MI->getOperand(Op+1);