1 //===- APFixedPoint.cpp - Fixed point constant handling ---------*- C++ -*-===//
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
12 //===----------------------------------------------------------------------===//
24     OS << "scale=" << getScale() << ", ";  in print()
35   int RelativeUpscale = getLsbWeight() - DstSema.getLsbWeight();  in convert()
45       std::min(DstSema.getIntegralBits() - DstSema.getLsbWeight(),  in convert()
81   unsigned CommonWidth = CommonMsb - CommonLsb + 1;  in compare()
86   ThisVal = ThisVal.shl(getLsbWeight() - CommonLsb);  in compare()
87   OtherVal = OtherVal.shl(Other.getLsbWeight() - CommonLsb);  in compare()
93       return -1;  in compare()
98       return -1;  in compare()
101       return -1;  in compare()
105       return -1;  in compare()
113       return -1;  in compare()
164   int CommonMSb = std::max(getMsbWeight() - hasSignOrPaddingBit(),  in getCommonSemantics()
165                            Other.getMsbWeight() - Other.hasSignOrPaddingBit());  in getCommonSemantics()
166   unsigned CommonWidth = CommonMSb - CommonLsb + 1;  in getCommonSemantics()
244   // Widen the LHS and RHS so we can perform a full multiplication.  in mul()
254   // Perform the full multiplication and downscale to get the same scale.  in mul()
268   assert(!Overflowed && "Full multiplication cannot overflow!");  in mul()
301   // Widen the LHS and RHS so we can perform a full division.  in div()
305       CommonFXSema.getWidth() * 2 + std::max(-CommonFXSema.getMsbWeight(), 0);  in div()
315   // perform the full division.  in div()
317     ThisVal = ThisVal.shl(-CommonFXSema.getLsbWeight());  in div()
327       Result = Result - 1;  in div()
403     Val = -Val;  in toString()
405     Str.push_back('-');  in toString()
408   int Scale = -getLsbWeight();  in toString()  local
409   APSInt IntPart = (OrigWidth > Scale) ? (Val >> Scale) : APSInt::get(0);  in toString()
412   unsigned Width = std::max(OrigWidth, Scale) + 4;  in toString()
413   APInt FractPart = Val.zextOrTrunc(Scale).zext(Width);  in toString()
414   APInt FractPartMask = APInt::getAllOnes(Scale).zext(Width);  in toString()
421         .lshr(Scale)  in toString()
439     return APFixedPoint(-Val, Sema);  in negate()
447     return Val.isMinSignedValue() ? getMax(Sema) : APFixedPoint(-Val, Sema);  in negate()
500   // Make sure that we are operating in a type that works with this fixed-point  in convertToFloat()
516   // Scale down the integer value in the float to match the correct scaling  in convertToFloat()
557   // Make sure that we are operating in a type that works with this fixed-point  in getFromFloatValue()
569   // Scale up the float so that the 'fractional' part of the mantissa ends up in  in getFromFloatValue()
573   APFloat ScaleFactor(std::pow(2, -DstFXSema.getLsbWeight()));  in getFromFloatValue()
582   // Round the integral value and scale back. This makes the  in getFromFloatValue()
585   // representable range of the fixed-point semantic even though no overflow  in getFromFloatValue()
593   // is outside the range representable by the fixed-point value.  in getFromFloatValue()