1*9880d681SAndroid Build Coastguard Worker; Test to make sure unused llvm.invariant.start calls are not trivially eliminated 2*9880d681SAndroid Build Coastguard Worker; RUN: opt < %s -instcombine -S | FileCheck %s 3*9880d681SAndroid Build Coastguard Worker 4*9880d681SAndroid Build Coastguard Workerdeclare void @g(i8*) 5*9880d681SAndroid Build Coastguard Worker 6*9880d681SAndroid Build Coastguard Workerdeclare {}* @llvm.invariant.start(i64, i8* nocapture) nounwind readonly 7*9880d681SAndroid Build Coastguard Worker 8*9880d681SAndroid Build Coastguard Workerdefine i8 @f() { 9*9880d681SAndroid Build Coastguard Worker %a = alloca i8 ; <i8*> [#uses=4] 10*9880d681SAndroid Build Coastguard Worker store i8 0, i8* %a 11*9880d681SAndroid Build Coastguard Worker %i = call {}* @llvm.invariant.start(i64 1, i8* %a) ; <{}*> [#uses=0] 12*9880d681SAndroid Build Coastguard Worker ; CHECK: call {}* @llvm.invariant.start 13*9880d681SAndroid Build Coastguard Worker call void @g(i8* %a) 14*9880d681SAndroid Build Coastguard Worker %r = load i8, i8* %a ; <i8> [#uses=1] 15*9880d681SAndroid Build Coastguard Worker ret i8 %r 16*9880d681SAndroid Build Coastguard Worker} 17