unsigned getGlobalBaseReg();
unsigned getConstDouble(double floatVal, unsigned Result);
bool SelectBitfieldInsert(SDOperand OR, unsigned Result);
+ unsigned FoldIfWideZeroExtend(SDOperand N);
unsigned SelectSetCR0(SDOperand CC);
unsigned SelectExpr(SDOperand N, bool Recording=false);
unsigned SelectExprFP(SDOperand N, unsigned Result);
return false;
}
+/// FoldIfWideZeroExtend - 32 bit PowerPC implicit masks shift amounts to the
+/// low six bits. If the shift amount is an ISD::AND node with a mask that is
+/// wider than the implicit mask, then we can get rid of the AND and let the
+/// shift do the mask.
+unsigned ISel::FoldIfWideZeroExtend(SDOperand N) {
+ unsigned C;
+ if (N.getOpcode() == ISD::AND &&
+ 5 == getImmediateForOpcode(N.getOperand(1), ISD::AND, C) && // isMask
+ 31 == (C & 0xFFFF) && // ME
+ 26 >= (C >> 16)) // MB
+ return SelectExpr(N.getOperand(0));
+ else
+ return SelectExpr(N);
+}
+
unsigned ISel::SelectSetCR0(SDOperand CC) {
unsigned Opc, Tmp1, Tmp2;
bool AlreadySelected = false;
BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp1).addImm(Tmp2).addImm(0)
.addImm(31-Tmp2);
} else {
- Tmp2 = SelectExpr(N.getOperand(1));
+ Tmp2 = FoldIfWideZeroExtend(N.getOperand(1));
BuildMI(BB, PPC::SLW, 2, Result).addReg(Tmp1).addReg(Tmp2);
}
return Result;
BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp1).addImm(32-Tmp2)
.addImm(Tmp2).addImm(31);
} else {
- Tmp2 = SelectExpr(N.getOperand(1));
+ Tmp2 = FoldIfWideZeroExtend(N.getOperand(1));
BuildMI(BB, PPC::SRW, 2, Result).addReg(Tmp1).addReg(Tmp2);
}
return Result;
Tmp2 = CN->getValue() & 0x1F;
BuildMI(BB, PPC::SRAWI, 2, Result).addReg(Tmp1).addImm(Tmp2);
} else {
- Tmp2 = SelectExpr(N.getOperand(1));
+ Tmp2 = FoldIfWideZeroExtend(N.getOperand(1));
BuildMI(BB, PPC::SRAW, 2, Result).addReg(Tmp1).addReg(Tmp2);
}
return Result;
"Not an i64 shift!");
unsigned ShiftOpLo = SelectExpr(N.getOperand(0));
unsigned ShiftOpHi = SelectExpr(N.getOperand(1));
- unsigned SHReg = SelectExpr(N.getOperand(2));
- Tmp1 = MakeReg(MVT::i32);
- Tmp2 = MakeReg(MVT::i32);
+ unsigned SHReg = FoldIfWideZeroExtend(N.getOperand(2));
+ Tmp1 = MakeReg(MVT::i32);
+ Tmp2 = MakeReg(MVT::i32);
Tmp3 = MakeReg(MVT::i32);
unsigned Tmp4 = MakeReg(MVT::i32);
unsigned Tmp5 = MakeReg(MVT::i32);