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1; RUN: llc < %s2; PR63633;4; This test case creates a phi join register with a single definition. The other5; predecessor blocks are implicit-def.6;7; If LiveIntervalAnalysis fails to recognize this as a phi join, the coalescer8; will detect an infinity valno loop.9;10target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"11target triple = "x86_64-unknown-linux-gnu"12 13define i32 @decode(ptr nocapture %input, i32 %offset, ptr nocapture %output) nounwind {14entry:15 br i1 undef, label %meshBB86, label %meshBB10216 17bb: ; preds = %meshBB106, %meshBB10218 br i1 false, label %bb9, label %meshBB9019 20bb.nph: ; preds = %meshBB9021 br label %meshBB11422 23bb.nph.fragment: ; preds = %meshBB11424 br label %meshBB11825 26bb1.fragment: ; preds = %meshBB11827 br i1 false, label %bb2, label %bb328 29bb2: ; preds = %bb1.fragment30 br label %meshBB7431 32bb2.fragment15: ; preds = %meshBB7433 br label %meshBB9834 35bb3: ; preds = %bb1.fragment36 br i1 undef, label %meshBB, label %meshBB10237 38bb4: ; preds = %meshBB39 br label %meshBB11840 41bb4.fragment: ; preds = %meshBB11842 br label %meshBB8243 44bb5: ; preds = %meshBB102, %meshBB8245 br i1 false, label %bb6, label %bb746 47bb6: ; preds = %bb548 br label %bb749 50bb7: ; preds = %meshBB98, %bb6, %bb551 br label %meshBB11452 53bb7.fragment: ; preds = %meshBB11454 br i1 undef, label %meshBB74, label %bb955 56bb9: ; preds = %bb7.fragment, %bb57 br label %bb1.i2358 59bb1.i23: ; preds = %meshBB110, %bb960 br i1 undef, label %meshBB106, label %meshBB11061 62skip_to_newline.exit26: ; preds = %meshBB10663 br label %meshBB8664 65skip_to_newline.exit26.fragment: ; preds = %meshBB8666 br i1 false, label %meshBB90, label %meshBB10667 68bb11.fragment: ; preds = %meshBB90, %meshBB8669 br label %meshBB12270 71bb1.i: ; preds = %meshBB122, %meshBB72 %ooffset.2.lcssa.phi.SV.phi203 = phi i32 [ 0, %meshBB122 ], [ %ooffset.2.lcssa.phi.SV.phi233, %meshBB ] ; <i32> [#uses=1]73 br label %meshBB9874 75bb1.i.fragment: ; preds = %meshBB9876 br i1 undef, label %meshBB78, label %meshBB77 78skip_to_newline.exit: ; preds = %meshBB7879 br i1 undef, label %bb12, label %meshBB11080 81bb12: ; preds = %skip_to_newline.exit82 br label %meshBB9483 84bb12.fragment: ; preds = %meshBB9485 br i1 false, label %bb13, label %meshBB7886 87bb13: ; preds = %bb12.fragment88 br label %meshBB8289 90bb13.fragment: ; preds = %meshBB8291 br i1 undef, label %meshBB94, label %meshBB12292 93bb14: ; preds = %meshBB9494 ret i32 %ooffset.2.lcssa.phi.SV.phi25095 96bb15: ; preds = %meshBB122, %meshBB110, %meshBB7897 unreachable98 99meshBB: ; preds = %bb1.i.fragment, %bb3100 %ooffset.2.lcssa.phi.SV.phi233 = phi i32 [ undef, %bb3 ], [ %ooffset.2.lcssa.phi.SV.phi209, %bb1.i.fragment ] ; <i32> [#uses=1]101 br i1 undef, label %bb1.i, label %bb4102 103meshBB74: ; preds = %bb7.fragment, %bb2104 br i1 false, label %meshBB118, label %bb2.fragment15105 106meshBB78: ; preds = %bb12.fragment, %bb1.i.fragment107 %ooffset.2.lcssa.phi.SV.phi239 = phi i32 [ %ooffset.2.lcssa.phi.SV.phi209, %bb1.i.fragment ], [ %ooffset.2.lcssa.phi.SV.phi250, %bb12.fragment ] ; <i32> [#uses=1]108 br i1 false, label %bb15, label %skip_to_newline.exit109 110meshBB82: ; preds = %bb13, %bb4.fragment111 br i1 false, label %bb5, label %bb13.fragment112 113meshBB86: ; preds = %skip_to_newline.exit26, %entry114 br i1 undef, label %skip_to_newline.exit26.fragment, label %bb11.fragment115 116meshBB90: ; preds = %skip_to_newline.exit26.fragment, %bb117 br i1 false, label %bb11.fragment, label %bb.nph118 119meshBB94: ; preds = %bb13.fragment, %bb12120 %ooffset.2.lcssa.phi.SV.phi250 = phi i32 [ 0, %bb13.fragment ], [ %ooffset.2.lcssa.phi.SV.phi239, %bb12 ] ; <i32> [#uses=2]121 br i1 false, label %bb12.fragment, label %bb14122 123meshBB98: ; preds = %bb1.i, %bb2.fragment15124 %ooffset.2.lcssa.phi.SV.phi209 = phi i32 [ undef, %bb2.fragment15 ], [ %ooffset.2.lcssa.phi.SV.phi203, %bb1.i ] ; <i32> [#uses=2]125 br i1 undef, label %bb1.i.fragment, label %bb7126 127meshBB102: ; preds = %bb3, %entry128 br i1 undef, label %bb5, label %bb129 130meshBB106: ; preds = %skip_to_newline.exit26.fragment, %bb1.i23131 br i1 undef, label %bb, label %skip_to_newline.exit26132 133meshBB110: ; preds = %skip_to_newline.exit, %bb1.i23134 br i1 false, label %bb15, label %bb1.i23135 136meshBB114: ; preds = %bb7, %bb.nph137 %meshStackVariable115.phi = phi i32 [ 19, %bb7 ], [ 8, %bb.nph ] ; <i32> [#uses=0]138 br i1 undef, label %bb.nph.fragment, label %bb7.fragment139 140meshBB118: ; preds = %meshBB74, %bb4, %bb.nph.fragment141 %meshCmp121 = icmp eq i32 undef, 10 ; <i1> [#uses=1]142 br i1 %meshCmp121, label %bb4.fragment, label %bb1.fragment143 144meshBB122: ; preds = %bb13.fragment, %bb11.fragment145 br i1 false, label %bb1.i, label %bb15146}147