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