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Modify the ISD::AND opcode case to use new immediate constant predicates.

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Includes wider support for rotate and mask cases.

Patch by Jim Laskey.

I've requested that Jim add new regression tests the newly handled cases.

llvm-svn: 22712
This commit is contained in:
Chris Lattner 2005-08-08 21:24:57 +00:00
parent 3b23144fc0
commit 051d45ce3c
1 changed files with 36 additions and 45 deletions
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81
lib/Target/PowerPC/PPC32ISelPattern.cpp
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@ -1709,58 +1709,49 @@ unsigned ISel::SelectExpr(SDOperand N, bool Recording) {
return Result;
case ISD::AND:
switch(getImmediateForOpcode(N.getOperand(1), opcode, Tmp2)) {
default: assert(0 && "unhandled result code");
case 0: // No immediate
// Check for andc: and, (xor a, -1), b
if (N.getOperand(0).getOpcode() == ISD::XOR &&
N.getOperand(0).getOperand(1).getOpcode() == ISD::Constant &&
cast<ConstantSDNode>(N.getOperand(0).getOperand(1))->isAllOnesValue()) {
if (isImmediate(N.getOperand(1), Tmp2)) {
if (isShiftedMask_32(Tmp2) || isShiftedMask_32(~Tmp2)) {
unsigned SH, MB, ME;
Opc = Recording ? PPC::RLWINMo : PPC::RLWINM;
unsigned OprOpc;
if (isOprShiftImm(N.getOperand(0), OprOpc, Tmp3) &&
isRotateAndMask(OprOpc, Tmp3, Tmp2, false, SH, MB, ME)) {
Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::ANDC, 2, Result).addReg(Tmp2).addReg(Tmp1);
return Result;
} else {
Tmp1 = SelectExpr(N.getOperand(0));
isRunOfOnes(Tmp2, MB, ME);
SH = 0;
}
// It wasn't and-with-complement, emit a regular and
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
Opc = Recording ? PPC::ANDo : PPC::AND;
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
break;
case 1: // Low immediate
BuildMI(BB, Opc, 4, Result).addReg(Tmp1).addImm(SH)
.addImm(MB).addImm(ME);
RecordSuccess = true;
return Result;
} else if (isUInt16(Tmp2)) {
Tmp2 = Lo16(Tmp2);
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::ANDIo, 2, Result).addReg(Tmp1).addImm(Tmp2);
break;
case 2: // Shifted immediate
RecordSuccess = true;
return Result;
} else if (isUInt16(Tmp2)) {
Tmp2 = Hi16(Tmp2);
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::ANDISo, 2, Result).addReg(Tmp1).addImm(Tmp2);
break;
case 5: // Bitfield mask
Opc = Recording ? PPC::RLWINMo : PPC::RLWINM;
Tmp3 = Tmp2 >> 16; // MB
Tmp2 &= 0xFFFF; // ME
// FIXME: Catch SHL-AND in addition to SRL-AND in this block.
if (N.getOperand(0).getOpcode() == ISD::SRL)
if (ConstantSDNode *SA =
dyn_cast<ConstantSDNode>(N.getOperand(0).getOperand(1))) {
// We can fold the RLWINM and the SRL together if the mask is
// clearing the top bits which are rotated around.
unsigned RotAmt = 32-(SA->getValue() & 31);
if (Tmp2 <= RotAmt) {
Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
BuildMI(BB, Opc, 4, Result).addReg(Tmp1).addImm(RotAmt)
.addImm(Tmp3).addImm(Tmp2);
break;
}
}
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, Opc, 4, Result).addReg(Tmp1).addImm(0)
.addImm(Tmp3).addImm(Tmp2);
break;
RecordSuccess = true;
return Result;
}
}
if (isOprNot(N.getOperand(0))) {
Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::ANDC, 2, Result).addReg(Tmp2).addReg(Tmp1);
RecordSuccess = false;
return Result;
}
// emit a regular and
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
Opc = Recording ? PPC::ANDo : PPC::AND;
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
RecordSuccess = true;
return Result;