[llvm-commits] CVS: llvm/lib/Target/X86/X86ISelPattern.cpp

[Chris Lattner]

Changes in directory llvm/lib/Target/X86:

X86ISelPattern.cpp updated: 1.88 -> 1.89
---
Log message:

We can fold promoted and non-promoted loads into divs also!


---
Diffs of the changes:  (+28 -0)

 X86ISelPattern.cpp |   28 ++++++++++++++++++++++++++++
 1 files changed, 28 insertions(+)


Index: llvm/lib/Target/X86/X86ISelPattern.cpp
diff -u llvm/lib/Target/X86/X86ISelPattern.cpp:1.88 llvm/lib/Target/X86/X86ISelPattern.cpp:1.89
--- llvm/lib/Target/X86/X86ISelPattern.cpp:1.88	Tue Jan 25 14:03:11 2005
+++ llvm/lib/Target/X86/X86ISelPattern.cpp	Tue Jan 25 14:35:10 2005
@@ -2034,6 +2034,34 @@
            "We don't support this operator!");
 
     if (N.getOpcode() == ISD::SDIV)
+
+      // We can fold loads into FpDIVs, but not really into any others.
+      if (N.getValueType() == MVT::f64) {
+        // Check for reversed and unreversed DIV.
+        if (isFoldableLoad(N.getOperand(0), N.getOperand(1), true)) {
+          if (N.getOperand(0).getOpcode() == ISD::EXTLOAD)
+            Opc = X86::FDIVR32m;
+          else
+            Opc = X86::FDIVR64m;
+          X86AddressMode AM;
+          EmitFoldedLoad(N.getOperand(0), AM);
+          Tmp1 = SelectExpr(N.getOperand(1));
+          addFullAddress(BuildMI(BB, Opc, 5, Result).addReg(Tmp1), AM);
+          return Result;
+        } else if (isFoldableLoad(N.getOperand(1), N.getOperand(0), true) &&
+                   N.getOperand(1).getOpcode() == ISD::LOAD) {
+          if (N.getOperand(1).getOpcode() == ISD::EXTLOAD)
+            Opc = X86::FDIV32m;
+          else
+            Opc = X86::FDIV64m;
+          X86AddressMode AM;
+          EmitFoldedLoad(N.getOperand(1), AM);
+          Tmp1 = SelectExpr(N.getOperand(0));
+          addFullAddress(BuildMI(BB, Opc, 5, Result).addReg(Tmp1), AM);
+          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();