1 //===- CSETest.cpp -----------------------------------------------===// 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 #include "GISelMITest.h" 10 #include "llvm/CodeGen/GlobalISel/CSEMIRBuilder.h" 11 12 namespace { 13 14 TEST_F(GISelMITest, TestCSE) { 15 if (!TM) 16 return; 17 18 LLT s16{LLT::scalar(16)}; 19 LLT s32{LLT::scalar(32)}; 20 auto MIBInput = B.buildInstr(TargetOpcode::G_TRUNC, {s16}, {Copies[0]}); 21 auto MIBInput1 = B.buildInstr(TargetOpcode::G_TRUNC, {s16}, {Copies[1]}); 22 auto MIBAdd = B.buildInstr(TargetOpcode::G_ADD, {s16}, {MIBInput, MIBInput}); 23 GISelCSEInfo CSEInfo; 24 CSEInfo.setCSEConfig(make_unique<CSEConfig>()); 25 CSEInfo.analyze(*MF); 26 B.setCSEInfo(&CSEInfo); 27 CSEMIRBuilder CSEB(B.getState()); 28 CSEB.setInsertPt(*EntryMBB, EntryMBB->begin()); 29 unsigned AddReg = MRI->createGenericVirtualRegister(s16); 30 auto MIBAddCopy = 31 CSEB.buildInstr(TargetOpcode::G_ADD, {AddReg}, {MIBInput, MIBInput}); 32 ASSERT_EQ(MIBAddCopy->getOpcode(), TargetOpcode::COPY); 33 auto MIBAdd2 = 34 CSEB.buildInstr(TargetOpcode::G_ADD, {s16}, {MIBInput, MIBInput}); 35 ASSERT_TRUE(&*MIBAdd == &*MIBAdd2); 36 auto MIBAdd4 = 37 CSEB.buildInstr(TargetOpcode::G_ADD, {s16}, {MIBInput, MIBInput}); 38 ASSERT_TRUE(&*MIBAdd == &*MIBAdd4); 39 auto MIBAdd5 = 40 CSEB.buildInstr(TargetOpcode::G_ADD, {s16}, {MIBInput, MIBInput1}); 41 ASSERT_TRUE(&*MIBAdd != &*MIBAdd5); 42 43 // Try building G_CONSTANTS. 44 auto MIBCst = CSEB.buildConstant(s32, 0); 45 auto MIBCst1 = CSEB.buildConstant(s32, 0); 46 ASSERT_TRUE(&*MIBCst == &*MIBCst1); 47 // Try the CFing of BinaryOps. 48 auto MIBCF1 = CSEB.buildInstr(TargetOpcode::G_ADD, {s32}, {MIBCst, MIBCst}); 49 ASSERT_TRUE(&*MIBCF1 == &*MIBCst); 50 51 // Try out building FCONSTANTs. 52 auto MIBFP0 = CSEB.buildFConstant(s32, 1.0); 53 auto MIBFP0_1 = CSEB.buildFConstant(s32, 1.0); 54 ASSERT_TRUE(&*MIBFP0 == &*MIBFP0_1); 55 CSEInfo.print(); 56 57 // Check G_UNMERGE_VALUES 58 auto MIBUnmerge = CSEB.buildUnmerge({s32, s32}, Copies[0]); 59 auto MIBUnmerge2 = CSEB.buildUnmerge({s32, s32}, Copies[0]); 60 ASSERT_TRUE(&*MIBUnmerge == &*MIBUnmerge2); 61 } 62 63 TEST_F(GISelMITest, TestCSEConstantConfig) { 64 if (!TM) 65 return; 66 67 LLT s16{LLT::scalar(16)}; 68 auto MIBInput = B.buildInstr(TargetOpcode::G_TRUNC, {s16}, {Copies[0]}); 69 auto MIBAdd = B.buildInstr(TargetOpcode::G_ADD, {s16}, {MIBInput, MIBInput}); 70 auto MIBZero = B.buildConstant(s16, 0); 71 GISelCSEInfo CSEInfo; 72 CSEInfo.setCSEConfig(make_unique<CSEConfigConstantOnly>()); 73 CSEInfo.analyze(*MF); 74 B.setCSEInfo(&CSEInfo); 75 CSEMIRBuilder CSEB(B.getState()); 76 CSEB.setInsertPt(*EntryMBB, EntryMBB->begin()); 77 auto MIBAdd1 = 78 CSEB.buildInstr(TargetOpcode::G_ADD, {s16}, {MIBInput, MIBInput}); 79 // We should CSE constants only. Adds should not be CSEd. 80 ASSERT_TRUE(MIBAdd1->getOpcode() != TargetOpcode::COPY); 81 ASSERT_TRUE(&*MIBAdd1 != &*MIBAdd); 82 // We should CSE constant. 83 auto MIBZeroTmp = CSEB.buildConstant(s16, 0); 84 ASSERT_TRUE(&*MIBZero == &*MIBZeroTmp); 85 } 86 } // namespace 87