1*9880d681SAndroid Build Coastguard Worker; RUN: opt -S -jump-threading < %s | FileCheck %s 2*9880d681SAndroid Build Coastguard Worker 3*9880d681SAndroid Build Coastguard Workerdeclare i8* @escape() 4*9880d681SAndroid Build Coastguard Workerdeclare void @llvm.assume(i1) 5*9880d681SAndroid Build Coastguard Worker 6*9880d681SAndroid Build Coastguard Workerdefine i1 @test1(i1 %cond) { 7*9880d681SAndroid Build Coastguard Workerentry: 8*9880d681SAndroid Build Coastguard Worker br i1 %cond, label %taken, label %not_taken 9*9880d681SAndroid Build Coastguard Worker 10*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @test1 11*9880d681SAndroid Build Coastguard Worker; CHECK: br i1 %cond, label %no, label %yes 12*9880d681SAndroid Build Coastguard Worker; CHECK: ret i1 true 13*9880d681SAndroid Build Coastguard Worker 14*9880d681SAndroid Build Coastguard Workertaken: 15*9880d681SAndroid Build Coastguard Worker %res1 = call i8* @escape() 16*9880d681SAndroid Build Coastguard Worker %a = icmp eq i8* %res1, null 17*9880d681SAndroid Build Coastguard Worker tail call void @llvm.assume(i1 %a) 18*9880d681SAndroid Build Coastguard Worker br label %done 19*9880d681SAndroid Build Coastguard Workernot_taken: 20*9880d681SAndroid Build Coastguard Worker %res2 = call i8* @escape() 21*9880d681SAndroid Build Coastguard Worker %b = icmp ne i8* %res2, null 22*9880d681SAndroid Build Coastguard Worker tail call void @llvm.assume(i1 %b) 23*9880d681SAndroid Build Coastguard Worker br label %done 24*9880d681SAndroid Build Coastguard Worker 25*9880d681SAndroid Build Coastguard Worker; An assume that can be used to simplify this comparison dominates each 26*9880d681SAndroid Build Coastguard Worker; predecessor branch (although no assume dominates the cmp itself). Make sure 27*9880d681SAndroid Build Coastguard Worker; this still can be simplified. 28*9880d681SAndroid Build Coastguard Worker 29*9880d681SAndroid Build Coastguard Workerdone: 30*9880d681SAndroid Build Coastguard Worker %res = phi i8* [ %res1, %taken ], [ %res2, %not_taken ] 31*9880d681SAndroid Build Coastguard Worker %cnd = icmp ne i8* %res, null 32*9880d681SAndroid Build Coastguard Worker br i1 %cnd, label %yes, label %no 33*9880d681SAndroid Build Coastguard Worker 34*9880d681SAndroid Build Coastguard Workeryes: 35*9880d681SAndroid Build Coastguard Worker ret i1 true 36*9880d681SAndroid Build Coastguard Workerno: 37*9880d681SAndroid Build Coastguard Worker ret i1 false 38*9880d681SAndroid Build Coastguard Worker} 39*9880d681SAndroid Build Coastguard Worker 40