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| //===- KnownBitsTest.cpp -------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "GISelMITest.h"
#include "llvm/CodeGen/GlobalISel/GISelKnownBits.h"
#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
TEST_F(GISelMITest, TestKnownBitsCst) {
StringRef MIRString = " %3:_(s8) = G_CONSTANT i8 1\n"
" %4:_(s8) = COPY %3\n";
setUp(MIRString);
if (!TM)
return;
unsigned CopyReg = Copies[Copies.size() - 1];
MachineInstr *FinalCopy = MRI->getVRegDef(CopyReg);
unsigned SrcReg = FinalCopy->getOperand(1).getReg();
unsigned DstReg = FinalCopy->getOperand(0).getReg();
GISelKnownBits Info(*MF);
KnownBits Res = Info.getKnownBits(SrcReg);
EXPECT_EQ((uint64_t)1, Res.One.getZExtValue());
EXPECT_EQ((uint64_t)0xfe, Res.Zero.getZExtValue());
KnownBits Res2 = Info.getKnownBits(DstReg);
EXPECT_EQ(Res.One.getZExtValue(), Res2.One.getZExtValue());
EXPECT_EQ(Res.Zero.getZExtValue(), Res2.Zero.getZExtValue());
}
TEST_F(GISelMITest, TestKnownBitsCstWithClass) {
StringRef MIRString = " %10:gpr32 = MOVi32imm 1\n"
" %4:_(s32) = COPY %10\n";
setUp(MIRString);
if (!TM)
return;
unsigned CopyReg = Copies[Copies.size() - 1];
MachineInstr *FinalCopy = MRI->getVRegDef(CopyReg);
unsigned SrcReg = FinalCopy->getOperand(1).getReg();
unsigned DstReg = FinalCopy->getOperand(0).getReg();
GISelKnownBits Info(*MF);
KnownBits Res = Info.getKnownBits(SrcReg);
// We can't analyze %3 due to the register class constraint. We will get a
// default-constructed KnownBits back.
EXPECT_EQ((uint64_t)1, Res.getBitWidth());
EXPECT_EQ((uint64_t)0, Res.One.getZExtValue());
EXPECT_EQ((uint64_t)0, Res.Zero.getZExtValue());
KnownBits Res2 = Info.getKnownBits(DstReg);
// We still don't know the values due to the register class constraint but %4
// did reveal the size of %3.
EXPECT_EQ((uint64_t)32, Res2.getBitWidth());
EXPECT_EQ(Res.One.getZExtValue(), Res2.One.getZExtValue());
EXPECT_EQ(Res.Zero.getZExtValue(), Res2.Zero.getZExtValue());
}
TEST_F(GISelMITest, TestKnownBitsPtrToIntViceVersa) {
StringRef MIRString = " %3:_(s16) = G_CONSTANT i16 256\n"
" %4:_(p0) = G_INTTOPTR %3\n"
" %5:_(s32) = G_PTRTOINT %4\n"
" %6:_(s32) = COPY %5\n";
setUp(MIRString);
if (!TM)
return;
unsigned CopyReg = Copies[Copies.size() - 1];
MachineInstr *FinalCopy = MRI->getVRegDef(CopyReg);
unsigned SrcReg = FinalCopy->getOperand(1).getReg();
GISelKnownBits Info(*MF);
KnownBits Res = Info.getKnownBits(SrcReg);
EXPECT_EQ(256u, Res.One.getZExtValue());
EXPECT_EQ(0xfffffeffu, Res.Zero.getZExtValue());
}
TEST_F(GISelMITest, TestKnownBitsXOR) {
StringRef MIRString = " %3:_(s8) = G_CONSTANT i8 4\n"
" %4:_(s8) = G_CONSTANT i8 7\n"
" %5:_(s8) = G_XOR %3, %4\n"
" %6:_(s8) = COPY %5\n";
setUp(MIRString);
if (!TM)
return;
unsigned CopyReg = Copies[Copies.size() - 1];
MachineInstr *FinalCopy = MRI->getVRegDef(CopyReg);
unsigned SrcReg = FinalCopy->getOperand(1).getReg();
GISelKnownBits Info(*MF);
KnownBits Res = Info.getKnownBits(SrcReg);
EXPECT_EQ(3u, Res.One.getZExtValue());
EXPECT_EQ(252u, Res.Zero.getZExtValue());
}
TEST_F(GISelMITest, TestKnownBits) {
StringRef MIR = " %3:_(s32) = G_TRUNC %0\n"
" %4:_(s32) = G_TRUNC %1\n"
" %5:_(s32) = G_CONSTANT i32 5\n"
" %6:_(s32) = G_CONSTANT i32 24\n"
" %7:_(s32) = G_CONSTANT i32 28\n"
" %14:_(p0) = G_INTTOPTR %7\n"
" %16:_(s32) = G_PTRTOINT %14\n"
" %8:_(s32) = G_SHL %3, %5\n"
" %9:_(s32) = G_SHL %4, %5\n"
" %10:_(s32) = G_OR %8, %6\n"
" %11:_(s32) = G_OR %9, %16\n"
" %12:_(s32) = G_MUL %10, %11\n"
" %13:_(s32) = COPY %12\n";
setUp(MIR);
if (!TM)
return;
unsigned CopyReg = Copies[Copies.size() - 1];
MachineInstr *FinalCopy = MRI->getVRegDef(CopyReg);
unsigned SrcReg = FinalCopy->getOperand(1).getReg();
GISelKnownBits Info(*MF);
KnownBits Known = Info.getKnownBits(SrcReg);
EXPECT_FALSE(Known.hasConflict());
EXPECT_EQ(0u, Known.One.getZExtValue());
EXPECT_EQ(31u, Known.Zero.getZExtValue());
APInt Zeroes = Info.getKnownZeroes(SrcReg);
EXPECT_EQ(Known.Zero, Zeroes);
}
TEST_F(GISelMITest, TestSignBitIsZero) {
setUp();
if (!TM)
return;
const LLT S32 = LLT::scalar(32);
auto SignBit = B.buildConstant(S32, 0x80000000);
auto Zero = B.buildConstant(S32, 0);
GISelKnownBits KnownBits(*MF);
EXPECT_TRUE(KnownBits.signBitIsZero(Zero.getReg(0)));
EXPECT_FALSE(KnownBits.signBitIsZero(SignBit.getReg(0)));
}
|