[llvm-commits] CVS: llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

[Chris Lattner]

Changes in directory llvm/lib/CodeGen/SelectionDAG:

SelectionDAG.cpp updated: 1.20 -> 1.21
---
Log message:

Constant fold shifts, turning this loop:

.LBB_Z5test0PdS__3:     # no_exit.1
        fldl data(,%eax,8)
        fldl 24(%esp)
        faddp %st(1)
        fstl 24(%esp)
        incl %eax
        movl $16000, %ecx
        sarl $3, %ecx
        cmpl %eax, %ecx
        fstpl 16(%esp)
        #FP_REG_KILL
        jg .LBB_Z5test0PdS__3   # no_exit.1

into:

.LBB_Z5test0PdS__3:     # no_exit.1
        fldl data(,%eax,8)
        fldl 24(%esp)
        faddp %st(1)
        fstl 24(%esp)
        incl %eax
        cmpl $2000, %eax
        fstpl 16(%esp)
        #FP_REG_KILL
        jl .LBB_Z5test0PdS__3   # no_exit.1



---
Diffs of the changes:  (+3 -0)

Index: llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:1.20 llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:1.21
--- llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:1.20	Sun Jan  9 14:52:51 2005
+++ llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp	Sun Jan  9 18:07:15 2005
@@ -535,6 +535,9 @@
       case ISD::AND  : return getConstant(C1 & C2, VT);
       case ISD::OR   : return getConstant(C1 | C2, VT);
       case ISD::XOR  : return getConstant(C1 ^ C2, VT);
+      case ISD::SHL  : return getConstant(C1 << (int)C2, VT);
+      case ISD::SRL  : return getConstant(C1 >> (unsigned)C2, VT);
+      case ISD::SRA  : return getConstant(N1C->getSignExtended() >>(int)C2, VT);
       default: break;
       }