54 lines
1.5 KiB
LLVM
54 lines
1.5 KiB
LLVM
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; RUN: opt -S -structurizecfg %s | FileCheck %s
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; r321751 introduced a bug where control flow branching from if to exit was
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; not handled properly and instead ended up in an infinite loop.
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define void @bug36015(i32 %cmp0, i32 %count) {
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entry:
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br label %loop.outer
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loop.outer:
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%ctr.loop.outer = phi i32 [ 0, %entry ], [ %ctr.else, %else ]
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call void @foo(i32 0)
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br label %loop.inner
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loop.inner:
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%ctr.loop.inner = phi i32 [ %ctr.loop.outer, %loop.outer ], [ %ctr.if, %if ]
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call void @foo(i32 1)
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%cond.inner = icmp eq i32 %cmp0, %ctr.loop.inner
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br i1 %cond.inner, label %if, label %else
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; CHECK: if:
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; CHECK: %cond.if.inv = xor i1 %cond.if, true
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; CHECK: br label %Flow
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if:
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%ctr.if = add i32 %ctr.loop.inner, 1
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call void @foo(i32 2)
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%cond.if = icmp slt i32 %ctr.if, %count
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br i1 %cond.if, label %loop.inner, label %exit
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; CHECK: Flow:
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; CHECK: %1 = phi i1 [ %cond.if.inv, %if ], [ true, %loop.inner ]
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; CHECK: %2 = phi i1 [ false, %if ], [ true, %loop.inner ]
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; CHECK: br i1 %1, label %Flow1, label %loop.inner
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; CHECK: Flow1:
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; CHECK: br i1 %2, label %else, label %Flow2
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; CHECK: else:
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; CHECK: br label %Flow2
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else:
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%ctr.else = add i32 %ctr.loop.inner, 1
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call void @foo(i32 3)
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%cond.else = icmp slt i32 %ctr.else, %count
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br i1 %cond.else, label %loop.outer, label %exit
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; CHECK: Flow2:
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; CHECK: %4 = phi i1 [ %cond.else.inv, %else ], [ true, %Flow1 ]
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; CHECK: br i1 %4, label %exit, label %loop.outer
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exit:
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ret void
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}
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declare void @foo(i32)
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