50 lines
2.2 KiB
LLVM
50 lines
2.2 KiB
LLVM
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; RUN: opt -gvn -S -o - %s | FileCheck %s
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; RUN: opt -passes=gvn -S -o - %s | FileCheck %s
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%struct.sk_buff = type opaque
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@l2tp_recv_dequeue_session = external dso_local local_unnamed_addr global i32, align 4
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@l2tp_recv_dequeue_skb = external dso_local local_unnamed_addr global %struct.sk_buff*, align 8
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@l2tp_recv_dequeue_session_2 = external dso_local local_unnamed_addr global i32, align 4
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@l2tp_recv_dequeue_session_0 = external dso_local local_unnamed_addr global i32, align 4
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declare void @llvm.assume(i1 noundef)
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define dso_local void @l2tp_recv_dequeue() local_unnamed_addr {
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entry:
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%0 = load i32, i32* @l2tp_recv_dequeue_session, align 4
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%conv = sext i32 %0 to i64
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%1 = inttoptr i64 %conv to %struct.sk_buff*
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%2 = load i32, i32* @l2tp_recv_dequeue_session_2, align 4
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%tobool.not = icmp eq i32 %2, 0
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br label %for.cond
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for.cond: ; preds = %if.end, %entry
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%storemerge = phi %struct.sk_buff* [ %1, %entry ], [ null, %if.end ]
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store %struct.sk_buff* %storemerge, %struct.sk_buff** @l2tp_recv_dequeue_skb, align 8
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br i1 %tobool.not, label %if.end, label %if.then
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if.then: ; preds = %for.cond
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%ns = bitcast %struct.sk_buff* %storemerge to i32*
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%3 = load i32, i32* %ns, align 4
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store i32 %3, i32* @l2tp_recv_dequeue_session_0, align 4
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; Splitting the critical edge from if.then to if.end will fail, but should not
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; cause an infinite loop in GVN. If we can one day split edges of callbr
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; indirect targets, great!
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; CHECK: callbr void asm sideeffect "", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@l2tp_recv_dequeue, %if.end))
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; CHECK-NEXT: to label %asm.fallthrough.i [label %if.end]
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callbr void asm sideeffect "", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@l2tp_recv_dequeue, %if.end))
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to label %asm.fallthrough.i [label %if.end]
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asm.fallthrough.i: ; preds = %if.then
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br label %if.end
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if.end: ; preds = %asm.fallthrough.i, %if.then, %for.cond
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%ns1 = bitcast %struct.sk_buff* %storemerge to i32*
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%4 = load i32, i32* %ns1, align 4
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%tobool2.not = icmp eq i32 %4, 0
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tail call void @llvm.assume(i1 %tobool2.not)
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br label %for.cond
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}
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