Fix cut & paste errors (32->64), and codegen float->int more optimally.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21098 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/PowerPC/PPC64ISelPattern.cpp b/lib/Target/PowerPC/PPC64ISelPattern.cpp
index 210acf580b436a71d7995c15ae1b2ba851529b6e..5f5ba5c0ce60aedf8a62ff35d0288bca51ac5ad2 100644 (file)
--- a/lib/Target/PowerPC/PPC64ISelPattern.cpp
+++ b/lib/Target/PowerPC/PPC64ISelPattern.cpp
@@ -1,4 +1,4 @@
-//===-- PPC32ISelPattern.cpp - A pattern matching inst selector for PPC32 -===//
+//===-- PPC64ISelPattern.cpp - A pattern matching inst selector for PPC64 -===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -7,7 +7,7 @@
 // 
 //===----------------------------------------------------------------------===//
 //
-// This file defines a pattern matching instruction selector for 32 bit PowerPC.
+// This file defines a pattern matching instruction selector for 64 bit PowerPC.
 //
 //===----------------------------------------------------------------------===//
 
@@ -1421,73 +1421,13 @@ unsigned ISel::SelectExpr(SDOperand N) {
     
   case ISD::FP_TO_UINT:
   case ISD::FP_TO_SINT: {
-    bool U = (ISD::FP_TO_UINT == opcode);
     Tmp1 = SelectExpr(N.getOperand(0));
-    if (!U) {
-      Tmp2 = MakeReg(MVT::f64);
-      BuildMI(BB, PPC::FCTIWZ, 1, Tmp2).addReg(Tmp1);
-      int FrameIdx = BB->getParent()->getFrameInfo()->CreateStackObject(8, 8);
-      addFrameReference(BuildMI(BB, PPC::STFD, 3).addReg(Tmp2), FrameIdx);
-      addFrameReference(BuildMI(BB, PPC::LWZ, 2, Result), FrameIdx, 4);
-      return Result;
-    } else {
-      unsigned Zero = getConstDouble(0.0);
-      unsigned MaxInt = getConstDouble((1LL << 32) - 1);
-      unsigned Border = getConstDouble(1LL << 31);
-      unsigned UseZero = MakeReg(MVT::f64);
-      unsigned UseMaxInt = MakeReg(MVT::f64);
-      unsigned UseChoice = MakeReg(MVT::f64);
-      unsigned TmpReg = MakeReg(MVT::f64);
-      unsigned TmpReg2 = MakeReg(MVT::f64);
-      unsigned ConvReg = MakeReg(MVT::f64);
-      unsigned IntTmp = MakeReg(MVT::i32);
-      unsigned XorReg = MakeReg(MVT::i32);
-      MachineFunction *F = BB->getParent();
-      int FrameIdx = F->getFrameInfo()->CreateStackObject(8, 8);
-      // Update machine-CFG edges
-      MachineBasicBlock *XorMBB = new MachineBasicBlock(BB->getBasicBlock());
-      MachineBasicBlock *PhiMBB = new MachineBasicBlock(BB->getBasicBlock());
-      MachineBasicBlock *OldMBB = BB;
-      ilist<MachineBasicBlock>::iterator It = BB; ++It;
-      F->getBasicBlockList().insert(It, XorMBB);
-      F->getBasicBlockList().insert(It, PhiMBB);
-      BB->addSuccessor(XorMBB);
-      BB->addSuccessor(PhiMBB);
-      // Convert from floating point to unsigned 32-bit value
-      // Use 0 if incoming value is < 0.0
-      BuildMI(BB, PPC::FSEL, 3, UseZero).addReg(Tmp1).addReg(Tmp1).addReg(Zero);
-      // Use 2**32 - 1 if incoming value is >= 2**32
-      BuildMI(BB, PPC::FSUB, 2, UseMaxInt).addReg(MaxInt).addReg(Tmp1);
-      BuildMI(BB, PPC::FSEL, 3, UseChoice).addReg(UseMaxInt).addReg(UseZero)
-        .addReg(MaxInt);
-      // Subtract 2**31
-      BuildMI(BB, PPC::FSUB, 2, TmpReg).addReg(UseChoice).addReg(Border);
-      // Use difference if >= 2**31
-      BuildMI(BB, PPC::FCMPU, 2, PPC::CR0).addReg(UseChoice).addReg(Border);
-      BuildMI(BB, PPC::FSEL, 3, TmpReg2).addReg(TmpReg).addReg(TmpReg)
-        .addReg(UseChoice);
-      // Convert to integer
-      BuildMI(BB, PPC::FCTIWZ, 1, ConvReg).addReg(TmpReg2);
-      addFrameReference(BuildMI(BB, PPC::STFD, 3).addReg(ConvReg), FrameIdx);
-      addFrameReference(BuildMI(BB, PPC::LWZ, 2, IntTmp), FrameIdx, 4);
-      BuildMI(BB, PPC::BLT, 2).addReg(PPC::CR0).addMBB(PhiMBB);
-      BuildMI(BB, PPC::B, 1).addMBB(XorMBB);
-
-      // XorMBB:
-      //   add 2**31 if input was >= 2**31
-      BB = XorMBB;
-      BuildMI(BB, PPC::XORIS, 2, XorReg).addReg(IntTmp).addImm(0x8000);
-      XorMBB->addSuccessor(PhiMBB);
-
-      // PhiMBB:
-      //   DestReg = phi [ IntTmp, OldMBB ], [ XorReg, XorMBB ]
-      BB = PhiMBB;
-      BuildMI(BB, PPC::PHI, 4, Result).addReg(IntTmp).addMBB(OldMBB)
-        .addReg(XorReg).addMBB(XorMBB);
-      return Result;
-    }
-    assert(0 && "Should never get here");
-    return 0;
+    Tmp2 = MakeReg(MVT::f64);
+    BuildMI(BB, PPC::FCTIDZ, 1, Tmp2).addReg(Tmp1);
+    int FrameIdx = BB->getParent()->getFrameInfo()->CreateStackObject(8, 8);
+    addFrameReference(BuildMI(BB, PPC::STFD, 3).addReg(Tmp2), FrameIdx);
+    addFrameReference(BuildMI(BB, PPC::LD, 2, Result), FrameIdx);
+    return Result;
   }
  
   case ISD::SETCC: