69 lines · cpp
1//===- DemandedBitsTest.cpp - DemandedBits 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-exception6//7//===----------------------------------------------------------------------===//8 9#include "llvm/Analysis/DemandedBits.h"10#include "../Support/KnownBitsTest.h"11#include "llvm/Support/KnownBits.h"12#include "gtest/gtest.h"13 14using namespace llvm;15 16namespace {17 18template <typename Fn1, typename Fn2>19static void TestBinOpExhaustive(Fn1 PropagateFn, Fn2 EvalFn) {20 unsigned Bits = 4;21 unsigned Max = 1 << Bits;22 ForeachKnownBits(Bits, [&](const KnownBits &Known1) {23 ForeachKnownBits(Bits, [&](const KnownBits &Known2) {24 for (unsigned AOut_ = 0; AOut_ < Max; AOut_++) {25 APInt AOut(Bits, AOut_);26 APInt AB1 = PropagateFn(0, AOut, Known1, Known2);27 APInt AB2 = PropagateFn(1, AOut, Known1, Known2);28 {29 // If the propagator claims that certain known bits30 // didn't matter, check it doesn't change its mind31 // when they become unknown.32 KnownBits Known1Redacted;33 KnownBits Known2Redacted;34 Known1Redacted.Zero = Known1.Zero & AB1;35 Known1Redacted.One = Known1.One & AB1;36 Known2Redacted.Zero = Known2.Zero & AB2;37 Known2Redacted.One = Known2.One & AB2;38 39 APInt AB1R = PropagateFn(0, AOut, Known1Redacted, Known2Redacted);40 APInt AB2R = PropagateFn(1, AOut, Known1Redacted, Known2Redacted);41 if (!Known1Redacted.hasConflict() && !Known2Redacted.hasConflict()) {42 EXPECT_EQ(AB1, AB1R);43 EXPECT_EQ(AB2, AB2R);44 }45 }46 ForeachNumInKnownBits(Known1, [&](APInt Value1) {47 ForeachNumInKnownBits(Known2, [&](APInt Value2) {48 APInt ReferenceResult = EvalFn((Value1 & AB1), (Value2 & AB2));49 APInt Result = EvalFn(Value1, Value2);50 EXPECT_EQ(Result & AOut, ReferenceResult & AOut);51 });52 });53 }54 });55 });56}57 58TEST(DemandedBitsTest, Add) {59 TestBinOpExhaustive(DemandedBits::determineLiveOperandBitsAdd,60 [](APInt N1, APInt N2) -> APInt { return N1 + N2; });61}62 63TEST(DemandedBitsTest, Sub) {64 TestBinOpExhaustive(DemandedBits::determineLiveOperandBitsSub,65 [](APInt N1, APInt N2) -> APInt { return N1 - N2; });66}67 68} // anonymous namespace69