auto Undef0 = CSEB.buildUndef(s32);
auto Undef1 = CSEB.buildUndef(s32);
EXPECT_EQ(&*Undef0, &*Undef1);
+
+ // If the observer is installed to the MF, CSE can also
+ // track new instructions built without the CSEBuilder and
+ // the newly built instructions are available for CSEing next
+ // time a build call is made through the CSEMIRBuilder.
+ // Additionally, the CSE implementation lazily hashes instructions
+ // (every build call) to give chance for the instruction to be fully
+ // built (say using .addUse().addDef().. so on).
+ GISelObserverWrapper WrapperObserver(&CSEInfo);
+ RAIIMFObsDelInstaller Installer(*MF, WrapperObserver);
+ MachineIRBuilder RegularBuilder(*MF);
+ RegularBuilder.setInsertPt(*EntryMBB, EntryMBB->begin());
+ auto NonCSEFMul = RegularBuilder.buildInstr(TargetOpcode::G_AND)
+ .addDef(MRI->createGenericVirtualRegister(s32))
+ .addUse(Copies[0])
+ .addUse(Copies[1]);
+ auto CSEFMul =
+ CSEB.buildInstr(TargetOpcode::G_AND, {s32}, {Copies[0], Copies[1]});
+ EXPECT_EQ(&*CSEFMul, &*NonCSEFMul);
}
TEST_F(AArch64GISelMITest, TestCSEConstantConfig) {