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Improve PPC64 equality comparisons like PPC32 comparisons.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30510 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -303,7 +303,7 @@ static bool isInt32Immediate(SDNode *N, unsigned &Imm) {
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/// isInt64Immediate - This method tests to see if the node is a 64-bit constant
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/// operand. If so Imm will receive the 64-bit value.
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static bool isInt64Immediate(SDNode *N, uint64_t &Imm) {
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if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i32) {
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if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i64) {
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Imm = cast<ConstantSDNode>(N)->getValue();
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return true;
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}
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@ -740,7 +740,35 @@ SDOperand PPCDAGToDAGISel::SelectCC(SDOperand LHS, SDOperand RHS,
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}
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} else if (LHS.getValueType() == MVT::i64) {
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uint64_t Imm;
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if (ISD::isUnsignedIntSetCC(CC)) {
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if (CC == ISD::SETEQ || CC == ISD::SETNE) {
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if (isInt64Immediate(RHS.Val, Imm)) {
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// SETEQ/SETNE comparison with 16-bit immediate, fold it.
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if (isUInt16(Imm))
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return SDOperand(CurDAG->getTargetNode(PPC::CMPLDI, MVT::i64, LHS,
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getI32Imm(Imm & 0xFFFF)), 0);
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// If this is a 16-bit signed immediate, fold it.
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if (isInt16(Imm))
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return SDOperand(CurDAG->getTargetNode(PPC::CMPDI, MVT::i64, LHS,
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getI32Imm(Imm & 0xFFFF)), 0);
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// For non-equality comparisons, the default code would materialize the
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// constant, then compare against it, like this:
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// lis r2, 4660
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// ori r2, r2, 22136
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// cmpd cr0, r3, r2
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// Since we are just comparing for equality, we can emit this instead:
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// xoris r0,r3,0x1234
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// cmpldi cr0,r0,0x5678
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// beq cr0,L6
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if (isUInt32(Imm)) {
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SDOperand Xor(CurDAG->getTargetNode(PPC::XORIS8, MVT::i64, LHS,
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getI64Imm(Imm >> 16)), 0);
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return SDOperand(CurDAG->getTargetNode(PPC::CMPLDI, MVT::i64, Xor,
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getI64Imm(Imm & 0xFFFF)), 0);
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}
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}
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Opc = PPC::CMPLD;
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} else if (ISD::isUnsignedIntSetCC(CC)) {
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if (isInt64Immediate(RHS.Val, Imm) && isUInt16(Imm))
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return SDOperand(CurDAG->getTargetNode(PPC::CMPLDI, MVT::i64, LHS,
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getI64Imm(Imm & 0xFFFF)), 0);
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@ -749,7 +777,7 @@ SDOperand PPCDAGToDAGISel::SelectCC(SDOperand LHS, SDOperand RHS,
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short SImm;
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if (isIntS16Immediate(RHS, SImm))
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return SDOperand(CurDAG->getTargetNode(PPC::CMPDI, MVT::i64, LHS,
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getI64Imm((int)SImm & 0xFFFF)),
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getI64Imm(SImm & 0xFFFF)),
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0);
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Opc = PPC::CMPD;
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}
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