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; RUN: opt -disable-output -passes=print-mustexecute < %s 2>&1 | FileCheck %s
@c = global i16 0, align 2
; CHECK-LABEL: define void @latch_cycle_irreducible
; CHECK: store i16 5, ptr @c, align 2{{$}}
define void @latch_cycle_irreducible() {
entry:
br label %loop
loop: ; preds = %loop.latch, %entry
%v = phi i32 [ 10, %entry ], [ 0, %loop.latch ]
%c = icmp eq i32 %v, 0
br i1 %c, label %loop.exit, label %loop.cont
loop.cont: ; preds = %loop
br i1 false, label %loop.irreducible, label %loop.latch
loop.irreducible: ; preds = %loop.latch, %loop.cont
store i16 5, ptr @c, align 2
br label %loop.latch
loop.latch: ; preds = %loop.irreducible, %loop.cont
br i1 false, label %loop.irreducible, label %loop
loop.exit: ; preds = %loop
ret void
}
; CHECK-LABEL: define void @latch_cycle_reducible
; CHECK: store i16 5, ptr @c, align 2{{$}}
define void @latch_cycle_reducible() {
entry:
br label %loop
loop: ; preds = %loop.latch, %entry
%v = phi i32 [ 10, %entry ], [ 0, %loop.latch ]
%c = icmp eq i32 %v, 0
br i1 %c, label %loop.exit, label %loop2
loop2: ; preds = %loop.latch, %loop
br i1 false, label %loop2.cont, label %loop.latch
loop2.cont: ; preds = %loop2
store i16 5, ptr @c, align 2
br label %loop.latch
loop.latch: ; preds = %loop2.cont, %loop2
br i1 false, label %loop2, label %loop
loop.exit: ; preds = %loop
ret void
}
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