; RUN: llc < %s ; PR6363 ; ; This test case creates a phi join register with a single definition. The other ; predecessor blocks are implicit-def. ; ; If LiveIntervalAnalysis fails to recognize this as a phi join, the coalescer ; will detect an infinity valno loop. ; target 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" target triple = "x86_64-unknown-linux-gnu" define i32 @decode(i8* nocapture %input, i32 %offset, i8* nocapture %output) nounwind { entry: br i1 undef, label %meshBB86, label %meshBB102 bb: ; preds = %meshBB106, %meshBB102 br i1 false, label %bb9, label %meshBB90 bb.nph: ; preds = %meshBB90 br label %meshBB114 bb.nph.fragment: ; preds = %meshBB114 br label %meshBB118 bb1.fragment: ; preds = %meshBB118 br i1 false, label %bb2, label %bb3 bb2: ; preds = %bb1.fragment br label %meshBB74 bb2.fragment15: ; preds = %meshBB74 br label %meshBB98 bb3: ; preds = %bb1.fragment br i1 undef, label %meshBB, label %meshBB102 bb4: ; preds = %meshBB br label %meshBB118 bb4.fragment: ; preds = %meshBB118 br label %meshBB82 bb5: ; preds = %meshBB102, %meshBB82 br i1 false, label %bb6, label %bb7 bb6: ; preds = %bb5 br label %bb7 bb7: ; preds = %meshBB98, %bb6, %bb5 br label %meshBB114 bb7.fragment: ; preds = %meshBB114 br i1 undef, label %meshBB74, label %bb9 bb9: ; preds = %bb7.fragment, %bb br label %bb1.i23 bb1.i23: ; preds = %meshBB110, %bb9 br i1 undef, label %meshBB106, label %meshBB110 skip_to_newline.exit26: ; preds = %meshBB106 br label %meshBB86 skip_to_newline.exit26.fragment: ; preds = %meshBB86 br i1 false, label %meshBB90, label %meshBB106 bb11.fragment: ; preds = %meshBB90, %meshBB86 br label %meshBB122 bb1.i: ; preds = %meshBB122, %meshBB %ooffset.2.lcssa.phi.SV.phi203 = phi i32 [ 0, %meshBB122 ], [ %ooffset.2.lcssa.phi.SV.phi233, %meshBB ] ; <i32> [#uses=1] br label %meshBB98 bb1.i.fragment: ; preds = %meshBB98 br i1 undef, label %meshBB78, label %meshBB skip_to_newline.exit: ; preds = %meshBB78 br i1 undef, label %bb12, label %meshBB110 bb12: ; preds = %skip_to_newline.exit br label %meshBB94 bb12.fragment: ; preds = %meshBB94 br i1 false, label %bb13, label %meshBB78 bb13: ; preds = %bb12.fragment br label %meshBB82 bb13.fragment: ; preds = %meshBB82 br i1 undef, label %meshBB94, label %meshBB122 bb14: ; preds = %meshBB94 ret i32 %ooffset.2.lcssa.phi.SV.phi250 bb15: ; preds = %meshBB122, %meshBB110, %meshBB78 unreachable meshBB: ; preds = %bb1.i.fragment, %bb3 %ooffset.2.lcssa.phi.SV.phi233 = phi i32 [ undef, %bb3 ], [ %ooffset.2.lcssa.phi.SV.phi209, %bb1.i.fragment ] ; <i32> [#uses=1] br i1 undef, label %bb1.i, label %bb4 meshBB74: ; preds = %bb7.fragment, %bb2 br i1 false, label %meshBB118, label %bb2.fragment15 meshBB78: ; preds = %bb12.fragment, %bb1.i.fragment %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] br i1 false, label %bb15, label %skip_to_newline.exit meshBB82: ; preds = %bb13, %bb4.fragment br i1 false, label %bb5, label %bb13.fragment meshBB86: ; preds = %skip_to_newline.exit26, %entry br i1 undef, label %skip_to_newline.exit26.fragment, label %bb11.fragment meshBB90: ; preds = %skip_to_newline.exit26.fragment, %bb br i1 false, label %bb11.fragment, label %bb.nph meshBB94: ; preds = %bb13.fragment, %bb12 %ooffset.2.lcssa.phi.SV.phi250 = phi i32 [ 0, %bb13.fragment ], [ %ooffset.2.lcssa.phi.SV.phi239, %bb12 ] ; <i32> [#uses=2] br i1 false, label %bb12.fragment, label %bb14 meshBB98: ; preds = %bb1.i, %bb2.fragment15 %ooffset.2.lcssa.phi.SV.phi209 = phi i32 [ undef, %bb2.fragment15 ], [ %ooffset.2.lcssa.phi.SV.phi203, %bb1.i ] ; <i32> [#uses=2] br i1 undef, label %bb1.i.fragment, label %bb7 meshBB102: ; preds = %bb3, %entry br i1 undef, label %bb5, label %bb meshBB106: ; preds = %skip_to_newline.exit26.fragment, %bb1.i23 br i1 undef, label %bb, label %skip_to_newline.exit26 meshBB110: ; preds = %skip_to_newline.exit, %bb1.i23 br i1 false, label %bb15, label %bb1.i23 meshBB114: ; preds = %bb7, %bb.nph %meshStackVariable115.phi = phi i32 [ 19, %bb7 ], [ 8, %bb.nph ] ; <i32> [#uses=0] br i1 undef, label %bb.nph.fragment, label %bb7.fragment meshBB118: ; preds = %meshBB74, %bb4, %bb.nph.fragment %meshCmp121 = icmp eq i32 undef, 10 ; <i1> [#uses=1] br i1 %meshCmp121, label %bb4.fragment, label %bb1.fragment meshBB122: ; preds = %bb13.fragment, %bb11.fragment br i1 false, label %bb1.i, label %bb15 }