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; This test ensures loop versioning does not produce an invalid dominator tree
; if the exit block of the loop (bb0) dominates the runtime check block
; (bb1 will become the runtime check block).
; RUN: opt -passes=loop-distribute -enable-loop-distribute -verify-dom-info -S -o - %s > %t
; RUN: opt -passes=loop-simplify,loop-distribute -enable-loop-distribute -verify-dom-info -S -o - %s > %t
; RUN: FileCheck --check-prefix CHECK-VERSIONING -input-file %t %s
; RUN: opt -passes=loop-versioning -verify-dom-info -S -o - %s > %t
; RUN: opt -passes=loop-simplify,loop-versioning -verify-dom-info -S -o - %s > %t
; RUN: FileCheck --check-prefix CHECK-VERSIONING -input-file %t %s
@c1 = external global i16
define void @f(i16 %a) {
br label %bb0
bb0:
br label %bb1
bb1:
%tmp1 = load i16, ptr @c1
br label %bb2
bb2:
%tmp2 = phi i16 [ %tmp1, %bb1 ], [ %tmp3, %bb2 ]
%tmp4 = getelementptr inbounds [1 x i32], ptr undef, i32 0, i32 4
store i32 1, ptr %tmp4
%tmp5 = getelementptr inbounds [1 x i32], ptr undef, i32 0, i32 9
store i32 0, ptr %tmp5
%tmp3 = add i16 %tmp2, 1
store i16 %tmp2, ptr @c1
%tmp6 = icmp sle i16 %tmp3, 0
br i1 %tmp6, label %bb2, label %bb0
}
; Simple check to make sure loop versioning happened.
; CHECK-VERSIONING: bb2.lver.check:
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