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