1*9880d681SAndroid Build Coastguard Worker; RUN: opt -mem2reg < %s -S | FileCheck %s 2*9880d681SAndroid Build Coastguard Worker; RUN: opt -passes=mem2reg < %s -S | FileCheck %s 3*9880d681SAndroid Build Coastguard Worker 4*9880d681SAndroid Build Coastguard Workerdeclare i32 @def(i32) 5*9880d681SAndroid Build Coastguard Workerdeclare i1 @use(i32) 6*9880d681SAndroid Build Coastguard Worker 7*9880d681SAndroid Build Coastguard Worker; Special case of a single-BB alloca does not apply here since the load 8*9880d681SAndroid Build Coastguard Worker; is affected by the following store. Expect this case to be identified 9*9880d681SAndroid Build Coastguard Worker; and a PHI node to be created. 10*9880d681SAndroid Build Coastguard Workerdefine void @test1() { 11*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @test1( 12*9880d681SAndroid Build Coastguard Worker entry: 13*9880d681SAndroid Build Coastguard Worker %t = alloca i32 14*9880d681SAndroid Build Coastguard Worker br label %loop 15*9880d681SAndroid Build Coastguard Worker 16*9880d681SAndroid Build Coastguard Worker loop: 17*9880d681SAndroid Build Coastguard Worker %v = load i32, i32* %t 18*9880d681SAndroid Build Coastguard Worker %c = call i1 @use(i32 %v) 19*9880d681SAndroid Build Coastguard Worker; CHECK: [[PHI:%.*]] = phi i32 [ undef, %entry ], [ %n, %loop ] 20*9880d681SAndroid Build Coastguard Worker; CHECK: call i1 @use(i32 [[PHI]]) 21*9880d681SAndroid Build Coastguard Worker %n = call i32 @def(i32 7) 22*9880d681SAndroid Build Coastguard Worker store i32 %n, i32* %t 23*9880d681SAndroid Build Coastguard Worker br i1 %c, label %loop, label %exit 24*9880d681SAndroid Build Coastguard Worker 25*9880d681SAndroid Build Coastguard Worker exit: 26*9880d681SAndroid Build Coastguard Worker ret void 27*9880d681SAndroid Build Coastguard Worker} 28*9880d681SAndroid Build Coastguard Worker 29*9880d681SAndroid Build Coastguard Worker; Same as above, except there is no following store. The alloca should just be 30*9880d681SAndroid Build Coastguard Worker; replaced with an undef 31*9880d681SAndroid Build Coastguard Workerdefine void @test2() { 32*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @test2( 33*9880d681SAndroid Build Coastguard Worker entry: 34*9880d681SAndroid Build Coastguard Worker %t = alloca i32 35*9880d681SAndroid Build Coastguard Worker br label %loop 36*9880d681SAndroid Build Coastguard Worker 37*9880d681SAndroid Build Coastguard Worker loop: 38*9880d681SAndroid Build Coastguard Worker %v = load i32, i32* %t 39*9880d681SAndroid Build Coastguard Worker %c = call i1 @use(i32 %v) 40*9880d681SAndroid Build Coastguard Worker; CHECK: %c = call i1 @use(i32 undef) 41*9880d681SAndroid Build Coastguard Worker br i1 %c, label %loop, label %exit 42*9880d681SAndroid Build Coastguard Worker 43*9880d681SAndroid Build Coastguard Worker exit: 44*9880d681SAndroid Build Coastguard Worker ret void 45*9880d681SAndroid Build Coastguard Worker} 46