1*9880d681SAndroid Build Coastguard Worker; RUN: opt < %s -sccp -loop-deletion -simplifycfg -S | not grep br 2*9880d681SAndroid Build Coastguard Worker 3*9880d681SAndroid Build Coastguard Worker; No matter how hard you try, sqrt(1.0) is always 1.0. This allows the 4*9880d681SAndroid Build Coastguard Worker; optimizer to delete this loop. 5*9880d681SAndroid Build Coastguard Worker 6*9880d681SAndroid Build Coastguard Workerdeclare double @sqrt(double) 7*9880d681SAndroid Build Coastguard Worker 8*9880d681SAndroid Build Coastguard Workerdefine double @test(i32 %param) { 9*9880d681SAndroid Build Coastguard Workerentry: 10*9880d681SAndroid Build Coastguard Worker br label %Loop 11*9880d681SAndroid Build Coastguard WorkerLoop: ; preds = %Loop, %entry 12*9880d681SAndroid Build Coastguard Worker %I2 = phi i32 [ 0, %entry ], [ %I3, %Loop ] ; <i32> [#uses=1] 13*9880d681SAndroid Build Coastguard Worker %V = phi double [ 1.000000e+00, %entry ], [ %V2, %Loop ] ; <double> [#uses=2] 14*9880d681SAndroid Build Coastguard Worker %V2 = call double @sqrt( double %V ) ; <double> [#uses=1] 15*9880d681SAndroid Build Coastguard Worker %I3 = add i32 %I2, 1 ; <i32> [#uses=2] 16*9880d681SAndroid Build Coastguard Worker %tmp.7 = icmp ne i32 %I3, %param ; <i1> [#uses=1] 17*9880d681SAndroid Build Coastguard Worker br i1 %tmp.7, label %Loop, label %Exit 18*9880d681SAndroid Build Coastguard WorkerExit: ; preds = %Loop 19*9880d681SAndroid Build Coastguard Worker ret double %V 20*9880d681SAndroid Build Coastguard Worker} 21*9880d681SAndroid Build Coastguard Worker 22