llvm/unittests/Support/KnownBitsTest.h

   1 //===- llvm/unittest/Support/KnownBitsTest.h - KnownBits tests ------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements helpers for KnownBits and DemandedBits unit tests.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_UNITTESTS_SUPPORT_KNOWNBITSTEST_H
  14 #define LLVM_UNITTESTS_SUPPORT_KNOWNBITSTEST_H
  15
  16 #include "llvm/Support/KnownBits.h"
  17
  18 namespace {
  19
  20 using namespace llvm;
  21
  22 template <typename FnTy> void ForeachKnownBits(unsigned Bits, FnTy Fn) {
  23   unsigned Max = 1 << Bits;
  24   KnownBits Known(Bits);
  25   for (unsigned Zero = 0; Zero < Max; ++Zero) {
  26     for (unsigned One = 0; One < Max; ++One) {
  27       Known.Zero = Zero;
  28       Known.One = One;
  29       if (Known.hasConflict())
  30         continue;
  31
  32       Fn(Known);
  33     }
  34   }
  35 }
  36
  37 template <typename FnTy>
  38 void ForeachNumInKnownBits(const KnownBits &Known, FnTy Fn) {
  39   unsigned Bits = Known.getBitWidth();
  40   unsigned Max = 1 << Bits;
  41   for (unsigned N = 0; N < Max; ++N) {
  42     APInt Num(Bits, N);
  43     if ((Num & Known.Zero) != 0 || (~Num & Known.One) != 0)
  44       continue;
  45
  46     Fn(Num);
  47   }
  48 }
  49
  50 } // end anonymous namespace
  51
  52 #endif