Disable formation of rlwinm instructions from SRA bases. This fixes

the 177.mesa failure from last night, and fixes the
CodeGen/PowerPC/2005-10-08-ArithmeticRotate.ll regression test I added.
If this code cannot be fixed, it should be removed for good, but I'll leave
it to Nate to decide its fate.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23670 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/PowerPC/PPCISelDAGToDAG.cpp b/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
index d0059bbcd31c8beaf82f68f18c50da62ef51ae44..09f980be4e2daf9adb5be1b6ab6048c2435f1cf9 100644 (file)
--- a/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
+++ b/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
@@ -217,7 +217,7 @@ static bool isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME) {
   return false;
 }
 
-// isRotateAndMask - Returns true if Mask and Shift can be folded in to a rotate
+// isRotateAndMask - Returns true if Mask and Shift can be folded into a rotate
 // and mask opcode and mask operation.
 static bool isRotateAndMask(SDNode *N, unsigned Mask, bool IsShiftMask,
                             unsigned &SH, unsigned &MB, unsigned &ME) {
@@ -1278,7 +1278,7 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
   }
   case ISD::SRA: {
     unsigned Imm, SH, MB, ME;
-    if (isOpcWithIntImmediate(N->getOperand(0).Val, ISD::AND, Imm) &&
+    if (0 &&isOpcWithIntImmediate(N->getOperand(0).Val, ISD::AND, Imm) &&
         isRotateAndMask(N, Imm, true, SH, MB, ME))
       CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, 
                            Select(N->getOperand(0).getOperand(0)),