Invert the TargetLowering flag that controls divide by consant expansion.

Add a new flag to TargetLowering indicating if the target has really cheap
  signed division by powers of two, make ppc use it.  This will probably go
  away in the future.
Implement some more ISD::SDIV folds in the dag combiner
Remove now dead code in the x86 backend.

llvm-svn: 23853

1 files changed, 0 insertions, 54 deletions

diff --git a/llvm/lib/Target/X86/X86ISelPattern.cpp b/llvm/lib/Target/X86/X86ISelPattern.cpp
index 531c33f09bc..a244afd6018 100644
--- a/llvm/lib/Target/X86/X86ISelPattern.cpp
+++ b/llvm/lib/Target/X86/X86ISelPattern.cpp
@@ -3035,60 +3035,6 @@ unsigned ISel::SelectExpr(SDOperand N) {
           return Result;
         }
       }
-
-      if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
-        // FIXME: These special cases should be handled by the lowering impl!
-        unsigned RHS = CN->getValue();
-        bool isNeg = false;
-        if ((int)RHS < 0) {
-          isNeg = true;
-          RHS = -RHS;
-        }
-        if (RHS && (RHS & (RHS-1)) == 0) {   // Signed division by power of 2?
-          unsigned Log = Log2_32(RHS);
-          unsigned SAROpc, SHROpc, ADDOpc, NEGOpc;
-          switch (N.getValueType()) {
-          default: assert("Unknown type to signed divide!");
-          case MVT::i8:
-            SAROpc = X86::SAR8ri;
-            SHROpc = X86::SHR8ri;
-            ADDOpc = X86::ADD8rr;
-            NEGOpc = X86::NEG8r;
-            break;
-          case MVT::i16:
-            SAROpc = X86::SAR16ri;
-            SHROpc = X86::SHR16ri;
-            ADDOpc = X86::ADD16rr;
-            NEGOpc = X86::NEG16r;
-            break;
-          case MVT::i32:
-            SAROpc = X86::SAR32ri;
-            SHROpc = X86::SHR32ri;
-            ADDOpc = X86::ADD32rr;
-            NEGOpc = X86::NEG32r;
-            break;
-          }
-          unsigned RegSize = MVT::getSizeInBits(N.getValueType());
-          Tmp1 = SelectExpr(N.getOperand(0));
-          unsigned TmpReg;
-          if (Log != 1) {
-            TmpReg = MakeReg(N.getValueType());
-            BuildMI(BB, SAROpc, 2, TmpReg).addReg(Tmp1).addImm(Log-1);
-          } else {
-            TmpReg = Tmp1;
-          }
-          unsigned TmpReg2 = MakeReg(N.getValueType());
-          BuildMI(BB, SHROpc, 2, TmpReg2).addReg(TmpReg).addImm(RegSize-Log);
-          unsigned TmpReg3 = MakeReg(N.getValueType());
-          BuildMI(BB, ADDOpc, 2, TmpReg3).addReg(Tmp1).addReg(TmpReg2);
-
-          unsigned TmpReg4 = isNeg ? MakeReg(N.getValueType()) : Result;
-          BuildMI(BB, SAROpc, 2, TmpReg4).addReg(TmpReg3).addImm(Log);
-          if (isNeg)
-            BuildMI(BB, NEGOpc, 1, Result).addReg(TmpReg4);
-          return Result;
-        }
-      }
     }
 
     if (getRegPressure(N.getOperand(0)) > getRegPressure(N.getOperand(1))) {