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Improve PPC64 equality comparisons like PPC32 comparisons.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30510 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-09-20 04:33:27 +00:00
parent 3836dbd3bd
commit 711762497c
1 changed files with 31 additions and 3 deletions
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34
lib/Target/PowerPC/PPCISelDAGToDAG.cpp
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@ -303,7 +303,7 @@ static bool isInt32Immediate(SDNode *N, unsigned &Imm) {
/// isInt64Immediate - This method tests to see if the node is a 64-bit constant
/// operand. If so Imm will receive the 64-bit value.
static bool isInt64Immediate(SDNode *N, uint64_t &Imm) {
if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i32) {
if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i64) {
Imm = cast<ConstantSDNode>(N)->getValue();
return true;
}
@ -740,7 +740,35 @@ SDOperand PPCDAGToDAGISel::SelectCC(SDOperand LHS, SDOperand RHS,
}
} else if (LHS.getValueType() == MVT::i64) {
uint64_t Imm;
if (ISD::isUnsignedIntSetCC(CC)) {
if (CC == ISD::SETEQ || CC == ISD::SETNE) {
if (isInt64Immediate(RHS.Val, Imm)) {
// SETEQ/SETNE comparison with 16-bit immediate, fold it.
if (isUInt16(Imm))
return SDOperand(CurDAG->getTargetNode(PPC::CMPLDI, MVT::i64, LHS,
getI32Imm(Imm & 0xFFFF)), 0);
// If this is a 16-bit signed immediate, fold it.
if (isInt16(Imm))
return SDOperand(CurDAG->getTargetNode(PPC::CMPDI, MVT::i64, LHS,
getI32Imm(Imm & 0xFFFF)), 0);
// For non-equality comparisons, the default code would materialize the
// constant, then compare against it, like this:
// lis r2, 4660
// ori r2, r2, 22136
// cmpd cr0, r3, r2
// Since we are just comparing for equality, we can emit this instead:
// xoris r0,r3,0x1234
// cmpldi cr0,r0,0x5678
// beq cr0,L6
if (isUInt32(Imm)) {
SDOperand Xor(CurDAG->getTargetNode(PPC::XORIS8, MVT::i64, LHS,
getI64Imm(Imm >> 16)), 0);
return SDOperand(CurDAG->getTargetNode(PPC::CMPLDI, MVT::i64, Xor,
getI64Imm(Imm & 0xFFFF)), 0);
}
}
Opc = PPC::CMPLD;
} else if (ISD::isUnsignedIntSetCC(CC)) {
if (isInt64Immediate(RHS.Val, Imm) && isUInt16(Imm))
return SDOperand(CurDAG->getTargetNode(PPC::CMPLDI, MVT::i64, LHS,
getI64Imm(Imm & 0xFFFF)), 0);
@ -749,7 +777,7 @@ SDOperand PPCDAGToDAGISel::SelectCC(SDOperand LHS, SDOperand RHS,
short SImm;
if (isIntS16Immediate(RHS, SImm))
return SDOperand(CurDAG->getTargetNode(PPC::CMPDI, MVT::i64, LHS,
getI64Imm((int)SImm & 0xFFFF)),
getI64Imm(SImm & 0xFFFF)),
0);
Opc = PPC::CMPD;
}