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; RUN: opt < %s -gvn | llvm-dis
; PR4256
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32"
target triple = "i386-pc-linux-gnu"
%llvm.dbg.anchor.type = type { i32, i32 }
%struct.cset = type { i8*, i8, i8, i32, i8* }
%struct.lmat = type { %struct.re_guts*, i32, %llvm.dbg.anchor.type*, i8*, i8*, i8*, i8*, i8**, i32, i8*, i8*, i8*, i8*, i8* }
%struct.re_guts = type { i32*, %struct.cset*, i8*, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i8*, i8*, i32, i32, i32, i32, [1 x i8] }
define i8* @lbackref(%struct.lmat* %m, i8* %start, i8* %stop, i32 %startst, i32 %stopst, i32 %lev, i32 %rec) nounwind {
entry:
br label %bb63
bb: ; preds = %bb63
switch i32 0, label %bb62 [
i32 268435456, label %bb2
i32 805306368, label %bb9
i32 -1610612736, label %bb51
]
bb2: ; preds = %bb
br label %bb62
bb9: ; preds = %bb
%0 = load i8, i8* %sp.1, align 1 ; <i8> [#uses=0]
br label %bb62
bb51: ; preds = %bb
%1 = load i8, i8* %sp.1, align 1 ; <i8> [#uses=0]
ret i8* null
bb62: ; preds = %bb9, %bb2, %bb
br label %bb63
bb63: ; preds = %bb84, %bb69, %bb62, %entry
%sp.1 = phi i8* [ null, %bb62 ], [ %sp.1.lcssa, %bb84 ], [ %start, %entry ], [ %sp.1.lcssa, %bb69 ] ; <i8*> [#uses=3]
br i1 false, label %bb, label %bb65
bb65: ; preds = %bb63
%sp.1.lcssa = phi i8* [ %sp.1, %bb63 ] ; <i8*> [#uses=4]
br i1 false, label %bb66, label %bb69
bb66: ; preds = %bb65
ret i8* null
bb69: ; preds = %bb65
switch i32 0, label %bb108.loopexit2.loopexit.loopexit [
i32 1342177280, label %bb63
i32 1476395008, label %bb84
i32 1879048192, label %bb104
i32 2013265920, label %bb93
]
bb84: ; preds = %bb69
%2 = tail call i8* @lbackref(%struct.lmat* %m, i8* %sp.1.lcssa, i8* %stop, i32 0, i32 %stopst, i32 0, i32 0) nounwind ; <i8*> [#uses=0]
br label %bb63
bb93: ; preds = %bb69
ret i8* null
bb104: ; preds = %bb69
%sp.1.lcssa.lcssa33 = phi i8* [ %sp.1.lcssa, %bb69 ] ; <i8*> [#uses=0]
unreachable
bb108.loopexit2.loopexit.loopexit: ; preds = %bb69
ret i8* null
}
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