Don't apply on PPC64 the 32bit ADDIC optimizations as there's no overflow

with 32bit values.

llvm-svn: 133439

2 files changed, 52 insertions, 14 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
index 511bb223cad..2176c02c850 100644
--- a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
@@ -610,6 +610,9 @@ SDNode *PPCDAGToDAGISel::SelectSETCC(SDNode *N) {
   DebugLoc dl = N->getDebugLoc();
   unsigned Imm;
   ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
+  EVT PtrVT = CurDAG->getTargetLoweringInfo().getPointerTy();
+  bool isPPC64 = (PtrVT == MVT::i64);
+
   if (isInt32Immediate(N->getOperand(1), Imm)) {
     // We can codegen setcc op, imm very efficiently compared to a brcond.
     // Check for those cases here.
@@ -624,6 +627,7 @@ SDNode *PPCDAGToDAGISel::SelectSETCC(SDNode *N) {
         return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
       }
       case ISD::SETNE: {
+        if (isPPC64) break;
         SDValue AD =
           SDValue(CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
                                          Op, getI32Imm(~0U)), 0);
@@ -647,6 +651,7 @@ SDNode *PPCDAGToDAGISel::SelectSETCC(SDNode *N) {
       switch (CC) {
       default: break;
       case ISD::SETEQ:
+        if (isPPC64) break;
         Op = SDValue(CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
                                             Op, getI32Imm(1)), 0);
         return CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32,
@@ -655,6 +660,7 @@ SDNode *PPCDAGToDAGISel::SelectSETCC(SDNode *N) {
                                                              getI32Imm(0)), 0),
                                       Op.getValue(1));
       case ISD::SETNE: {
+        if (isPPC64) break;
         Op = SDValue(CurDAG->getMachineNode(PPC::NOR, dl, MVT::i32, Op, Op), 0);
         SDNode *AD = CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
                                             Op, getI32Imm(~0U));
@@ -996,22 +1002,25 @@ SDNode *PPCDAGToDAGISel::Select(SDNode *N) {
   }
   case ISD::SELECT_CC: {
     ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(4))->get();
+    EVT PtrVT = CurDAG->getTargetLoweringInfo().getPointerTy();
+    bool isPPC64 = (PtrVT == MVT::i64);
 
     // Handle the setcc cases here.  select_cc lhs, 0, 1, 0, cc
-    if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N->getOperand(1)))
-      if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N->getOperand(2)))
-        if (ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N->getOperand(3)))
-          if (N1C->isNullValue() && N3C->isNullValue() &&
-              N2C->getZExtValue() == 1ULL && CC == ISD::SETNE &&
-              // FIXME: Implement this optzn for PPC64.
-              N->getValueType(0) == MVT::i32) {
-            SDNode *Tmp =
-              CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
-                                     N->getOperand(0), getI32Imm(~0U));
-            return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32,
-                                        SDValue(Tmp, 0), N->getOperand(0),
-                                        SDValue(Tmp, 1));
-          }
+    if (!isPPC64)
+      if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N->getOperand(1)))
+        if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N->getOperand(2)))
+          if (ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N->getOperand(3)))
+            if (N1C->isNullValue() && N3C->isNullValue() &&
+                N2C->getZExtValue() == 1ULL && CC == ISD::SETNE &&
+                // FIXME: Implement this optzn for PPC64.
+                N->getValueType(0) == MVT::i32) {
+              SDNode *Tmp =
+                CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
+                                       N->getOperand(0), getI32Imm(~0U));
+              return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32,
+                                          SDValue(Tmp, 0), N->getOperand(0),
+                                          SDValue(Tmp, 1));
+            }
 
     SDValue CCReg = SelectCC(N->getOperand(0), N->getOperand(1), CC, dl);
     unsigned BROpc = getPredicateForSetCC(CC);
diff --git a/llvm/test/CodeGen/PowerPC/ppc64-32bit-addic.ll b/llvm/test/CodeGen/PowerPC/ppc64-32bit-addic.ll
new file mode 100644
index 00000000000..4d323dac54f
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/ppc64-32bit-addic.ll
@@ -0,0 +1,29 @@
+; Check that the ADDIC optimizations are not applied on PPC64
+; RUN: llc < %s | FileCheck %s
+; ModuleID = 'os_unix.c'
+target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64"
+target triple = "powerpc64-unknown-freebsd9.0"
+
+define i32 @notZero(i32 %call) nounwind {
+entry:
+; CHECK-NOT: addic
+  %not.tobool = icmp ne i32 %call, 0
+  %. = zext i1 %not.tobool to i32
+  ret i32 %.
+}
+
+define i32 @isMinusOne(i32 %call) nounwind {
+entry:
+; CHECK-NOT: addic
+  %not.tobool = icmp eq i32 %call, -1
+  %. = zext i1 %not.tobool to i32
+  ret i32 %.
+}
+
+define i32 @isNotMinusOne(i32 %call) nounwind {
+entry:
+; CHECK-NOT: addic
+  %not.tobool = icmp ne i32 %call, -1
+  %. = zext i1 %not.tobool to i32
+  ret i32 %.
+}