64 lines
1.8 KiB
LLVM
64 lines
1.8 KiB
LLVM
; RUN: opt -jump-threading -S < %s | FileCheck %s
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; RUN: opt -passes=jump-threading -S < %s | FileCheck %s
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; Check the unreachable loop won't cause infinite loop
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; in jump-threading when it tries to update the predecessors'
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; profile metadata from a phi node.
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define void @unreachable_single_bb_loop() {
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; CHECK-LABEL: @unreachable_single_bb_loop()
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bb:
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%tmp = call i32 @a()
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%tmp1 = icmp eq i32 %tmp, 1
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br i1 %tmp1, label %bb5, label %bb8
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; unreachable single bb loop.
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bb2: ; preds = %bb2
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%tmp4 = icmp ne i32 %tmp, 1
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switch i1 %tmp4, label %bb2 [
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i1 0, label %bb5
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i1 1, label %bb8
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]
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bb5: ; preds = %bb2, %bb
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%tmp6 = phi i1 [ %tmp1, %bb ], [ false, %bb2 ]
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br i1 %tmp6, label %bb8, label %bb7, !prof !0
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bb7: ; preds = %bb5
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br label %bb8
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bb8: ; preds = %bb8, %bb7, %bb5, %bb2
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ret void
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}
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define void @unreachable_multi_bbs_loop() {
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; CHECK-LABEL: @unreachable_multi_bbs_loop()
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bb:
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%tmp = call i32 @a()
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%tmp1 = icmp eq i32 %tmp, 1
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br i1 %tmp1, label %bb5, label %bb8
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; unreachable two bbs loop.
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bb3: ; preds = %bb2
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br label %bb2
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bb2: ; preds = %bb3
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%tmp4 = icmp ne i32 %tmp, 1
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switch i1 %tmp4, label %bb3 [
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i1 0, label %bb5
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i1 1, label %bb8
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]
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bb5: ; preds = %bb2, %bb
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%tmp6 = phi i1 [ %tmp1, %bb ], [ false, %bb2 ]
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br i1 %tmp6, label %bb8, label %bb7, !prof !0
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bb7: ; preds = %bb5
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br label %bb8
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bb8: ; preds = %bb8, %bb7, %bb5, %bb2
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ret void
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}
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declare i32 @a()
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!0 = !{!"branch_weights", i32 2146410443, i32 1073205}
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