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Add support for sdiv by 2^k and -2^k. Producing code like:

Browse Source 
_test:
        srawi r2, r3, 2
        addze r3, r2
        blr


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23052 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-08-25 17:50:06 +00:00
parent ee84f11577
commit 8784a23075
1 changed files with 27 additions and 1 deletions
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28
lib/Target/PowerPC/PPCISelDAGToDAG.cpp
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@ -695,10 +695,36 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
case MVT::f32: Opc = PPC::FMULS; break;
case MVT::f64: Opc = PPC::FMUL; break;
}
CurDAG->SelectNodeTo(N, N->getValueType(0), Opc, Select(N->getOperand(0)),
CurDAG->SelectNodeTo(N, MVT::i32, Opc, Select(N->getOperand(0)),
Select(N->getOperand(1)));
break;
}
case ISD::SDIV: {
unsigned Imm;
if (isIntImmediate(N->getOperand(1), Imm)) {
if ((signed)Imm > 0 && isPowerOf2_32(Imm)) {
SDOperand Op =
CurDAG->getTargetNode(PPC::SRAWI, MVT::i32, MVT::Flag,
Select(N->getOperand(0)),
getI32Imm(Log2_32(Imm)));
CurDAG->SelectNodeTo(N, MVT::i32, PPC::ADDZE,
Op.getValue(0), Op.getValue(1));
break;
} else if ((signed)Imm < 0 && isPowerOf2_32(-Imm)) {
SDOperand Op =
CurDAG->getTargetNode(PPC::SRAWI, MVT::Flag, MVT::i32,
Select(N->getOperand(0)),
getI32Imm(Log2_32(-Imm)));
SDOperand PT =
CurDAG->getTargetNode(PPC::ADDZE, MVT::i32, Op.getValue(1),
Op.getValue(0));
CurDAG->SelectNodeTo(N, MVT::i32, PPC::NEG, PT);
break;
}
}
assert(0 && "SDIV not implemented yet!");
abort();
}
case ISD::MULHS:
assert(N->getValueType(0) == MVT::i32);
CurDAG->SelectNodeTo(N, MVT::i32, PPC::MULHW, Select(N->getOperand(0)),