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1; RUN: llc < %s > %t2; PR63003target 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-n8:16:32"4target triple = "i386-pc-linux-gnu"5 6; When the "154" loops back onto itself, it defines a register after using it.7; The first value of the register is implicit-def.8 9%"struct location_chain_def" = type { ptr, ptr, ptr, i32 }10%"struct real_value" = type { i32, [5 x i32] }11%"struct rtx_def" = type { i16, i8, i8, %"union u" }12%"union u" = type { %"struct real_value" }13 14define i32 @variable_union(ptr nocapture %slot, ptr nocapture %data) nounwind {15entry:16 br i1 undef, label %"4.thread", label %"3"17 18"4.thread": ; preds = %entry19 unreachable20 21"3": ; preds = %entry22 br i1 undef, label %"19", label %"20"23 24"19": ; preds = %"3"25 unreachable26 27"20": ; preds = %"3"28 br i1 undef, label %"56.preheader", label %dv_onepart_p.exit29 30dv_onepart_p.exit: ; preds = %"20"31 unreachable32 33"56.preheader": ; preds = %"20"34 br label %"56"35 36"50": ; preds = %"57"37 br label %"56"38 39"56": ; preds = %"50", %"56.preheader"40 br i1 undef, label %"57", label %"58"41 42"57": ; preds = %"56"43 br i1 undef, label %"50", label %"58"44 45"58": ; preds = %"57", %"56"46 br i1 undef, label %"62", label %"63"47 48"62": ; preds = %"58"49 unreachable50 51"63": ; preds = %"58"52 br i1 undef, label %"67", label %"66"53 54"66": ; preds = %"63"55 br label %"67"56 57"67": ; preds = %"66", %"63"58 br label %"68"59 60"68": ; preds = %"161", %"67"61 br i1 undef, label %"153", label %"161"62 63"153": ; preds = %"68"64 br i1 undef, label %"160", label %bb.nph4665 66bb.nph46: ; preds = %"153"67 br label %"154"68 69"154": ; preds = %"154", %bb.nph4670 %0 = phi ptr [ undef, %bb.nph46 ], [ undef, %"154" ] ; <ptr> [#uses=1]71 store ptr undef, ptr %0, align 472 br i1 undef, label %"160", label %"154"73 74"160": ; preds = %"154", %"153"75 br label %"161"76 77"161": ; preds = %"160", %"68"78 br label %"68"79}80