lib/Analysis/DemandedBits.cpp

90   unsigned BitWidth = AB.getBitWidth();
99       [&](unsigned BitWidth, const Value *V1, const Value *V2) {
105         Known = KnownBits(BitWidth);
109           Known2 = KnownBits(BitWidth);
136           ComputeKnownBits(BitWidth, Val, nullptr);
137           AB = APInt::getHighBitsSet(BitWidth,
138                  std::min(BitWidth, Known.countMaxLeadingZeros()+1));
146           ComputeKnownBits(BitWidth, Val, nullptr);
147           AB = APInt::getLowBitsSet(BitWidth,
148                  std::min(BitWidth, Known.countMaxTrailingZeros()+1));
157           if (isPowerOf2_32(BitWidth))
158             AB = BitWidth - 1;
160           // Normalize to funnel shift left. APInt shifts of BitWidth are well-
162           uint64_t ShiftAmt = SA->urem(BitWidth);
164             ShiftAmt = BitWidth - ShiftAmt;
169             AB = AOut.shl(BitWidth - ShiftAmt);
179         AB = APInt::getBitsSetFrom(BitWidth, AOut.countTrailingZeros());
188       ComputeKnownBits(BitWidth, UserI->getOperand(0), UserI->getOperand(1));
196       ComputeKnownBits(BitWidth, UserI->getOperand(0), UserI->getOperand(1));
204     AB = APInt::getLowBitsSet(BitWidth, AOut.getActiveBits());
210         uint64_t ShiftAmt = ShiftAmtC->getLimitedValue(BitWidth - 1);
217           AB |= APInt::getHighBitsSet(BitWidth, ShiftAmt+1);
219           AB |= APInt::getHighBitsSet(BitWidth, ShiftAmt);
227         uint64_t ShiftAmt = ShiftAmtC->getLimitedValue(BitWidth - 1);
233           AB |= APInt::getLowBitsSet(BitWidth, ShiftAmt);
241         uint64_t ShiftAmt = ShiftAmtC->getLimitedValue(BitWidth - 1);
246         if ((AOut & APInt::getHighBitsSet(BitWidth, ShiftAmt))
253           AB |= APInt::getLowBitsSet(BitWidth, ShiftAmt);
264     ComputeKnownBits(BitWidth, UserI->getOperand(0), UserI->getOperand(1));
277     ComputeKnownBits(BitWidth, UserI->getOperand(0), UserI->getOperand(1));
288     AB = AOut.zext(BitWidth);
291     AB = AOut.trunc(BitWidth);
294     AB = AOut.trunc(BitWidth);
299                                       AOut.getBitWidth() - BitWidth))
409         unsigned BitWidth = T->getScalarSizeInBits();
410         APInt AB = APInt::getAllOnesValue(BitWidth);
412           AB = APInt(BitWidth, 0);