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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

llvm-svn: 19427
This commit is contained in:
Chris Lattner 2005-01-10 00:07:15 +00:00
parent c892a0db9f
commit 0966a75e76
1 changed files with 3 additions and 0 deletions
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3
llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -535,6 +535,9 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
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;
}