diff options
Diffstat (limited to 'llvm/test/Transforms/LoopPredication')
| -rw-r--r-- | llvm/test/Transforms/LoopPredication/basic.ll | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopPredication/basic.ll b/llvm/test/Transforms/LoopPredication/basic.ll index 6f294b5b67e..88fa1bb95b2 100644 --- a/llvm/test/Transforms/LoopPredication/basic.ll +++ b/llvm/test/Transforms/LoopPredication/basic.ll @@ -1853,3 +1853,29 @@ exit: ret i32 0 } +; Negative test, make sure we don't crash on unconditional latches +; TODO: there's no reason we shouldn't be able to predicate the +; condition for an statically infinite loop. +define i32 @unconditional_latch(i32* %a, i32 %length) { +; CHECK-LABEL: @unconditional_latch( +; CHECK-NEXT: loop.preheader: +; CHECK-NEXT: br label [[LOOP:%.*]] +; CHECK: loop: +; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 400, [[LOOP_PREHEADER:%.*]] ] +; CHECK-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LENGTH:%.*]] +; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[WITHIN_BOUNDS]], i32 9) [ "deopt"() ] +; CHECK-NEXT: store volatile i32 0, i32* [[A:%.*]] +; CHECK-NEXT: [[I_NEXT]] = add i32 [[I]], 1 +; CHECK-NEXT: br label [[LOOP]] +; +loop.preheader: + br label %loop + +loop: + %i = phi i32 [ %i.next, %loop ], [ 400, %loop.preheader ] + %within.bounds = icmp ult i32 %i, %length + call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ] + store volatile i32 0, i32* %a + %i.next = add i32 %i, 1 + br label %loop +} |
