2010-02-23-SingleDefPhiJoin.ll [plain text]
; 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
}