1 ; RUN: llc < %s -march=x86 | FileCheck %s 2 ; 3 ; Test RegistersDefinedFromSameValue. We have multiple copies of the same vreg: 4 ; while.body85.i: 5 ; vreg1 = copy vreg2 6 ; vreg2 = add 7 ; critical edge from land.lhs.true.i -> if.end117.i: 8 ; vreg27 = vreg2 9 ; critical edge from land.lhs.true103.i -> if.end117.i: 10 ; vreg27 = vreg2 11 ; if.then108.i: 12 ; vreg27 = vreg1 13 ; 14 ; Prior to fixing PR10920 401.bzip miscompile, the coalescer would 15 ; consider vreg1 and vreg27 to be copies of the same value. It would 16 ; then remove one of the critical edge copes, which cannot safely be removed. 17 ; 18 ; CHECK: # %while.body85.i 19 ; CHECK-NOT: # % 20 ; CHECK-NOT: add 21 ; CHECK: movl %[[POSTR:e[abcdxi]+]], %[[PRER:e[abcdxi]+]] 22 ; CHECK: addl %{{.*}}, %[[POSTR]] 23 ; CHECK: # %while.end.i 24 ; CHECK: movl %[[POSTR]], %[[USER:e[abcdxi]+]] 25 ; CHECK: # %land.lhs.true.i 26 ; CHECK: movl %[[POSTR]], %[[USER]] 27 ; CHECK: # %land.lhs.true103.i 28 ; CHECK: movl %[[POSTR]], %[[USER]] 29 ; CHECK: # %if.then108.i 30 ; [[PRER] live out, so nothing on this path should define it. 31 ; CHECK-NOT: , %[[PRER]] 32 ; CHECK: # %if.end117.i 33 34 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-f80:128:128-n8:16:32" 35 36 @.str3 = external unnamed_addr constant [59 x i8], align 1 37 38 define void @BZ2_compressBlock() nounwind ssp { 39 entry: 40 br i1 undef, label %if.then68, label %if.end85 41 42 if.then68: ; preds = %entry 43 br label %for.body.i.i 44 45 for.body.i.i: ; preds = %for.inc.i.i, %if.then68 46 br i1 undef, label %for.inc.i.i, label %if.then.i.i 47 48 if.then.i.i: ; preds = %for.body.i.i 49 br label %for.inc.i.i 50 51 for.inc.i.i: ; preds = %if.then.i.i, %for.body.i.i 52 br i1 undef, label %makeMaps_e.exit.i, label %for.body.i.i 53 54 makeMaps_e.exit.i: ; preds = %for.inc.i.i 55 br i1 undef, label %for.cond19.preheader.i, label %for.cond.for.cond19.preheader_crit_edge.i 56 57 for.cond.for.cond19.preheader_crit_edge.i: ; preds = %makeMaps_e.exit.i 58 unreachable 59 60 for.cond19.preheader.i: ; preds = %makeMaps_e.exit.i 61 br i1 undef, label %for.body25.lr.ph.i, label %for.cond33.preheader.i 62 63 for.body25.lr.ph.i: ; preds = %for.cond19.preheader.i 64 br label %for.body25.i 65 66 for.cond33.preheader.i: ; preds = %for.body25.i, %for.cond19.preheader.i 67 br i1 undef, label %if.then.i, label %if.end.i 68 69 for.body25.i: ; preds = %for.body25.i, %for.body25.lr.ph.i 70 br i1 undef, label %for.body25.i, label %for.cond33.preheader.i 71 72 if.then.i: ; preds = %for.cond33.preheader.i 73 br label %if.end.i 74 75 if.end.i: ; preds = %if.then.i, %for.cond33.preheader.i 76 br i1 undef, label %for.inc27.us.5.i, label %for.end30.i 77 78 for.end30.i: ; preds = %for.inc27.us.5.i, %if.end.i 79 br i1 undef, label %if.end36.i, label %if.then35.i 80 81 if.then35.i: ; preds = %for.end30.i 82 unreachable 83 84 if.end36.i: ; preds = %for.end30.i 85 %sub83.i = add nsw i32 undef, 1 86 br label %while.body.i188 87 88 for.cond182.preheader.i: ; preds = %for.end173.i 89 br i1 undef, label %for.inc220.us.i, label %while.body300.preheader.i 90 91 while.body.i188: ; preds = %for.end173.i, %if.end36.i 92 %gs.0526.i = phi i32 [ 0, %if.end36.i ], [ %add177.i, %for.end173.i ] 93 %or.cond514517.i = and i1 false, undef 94 br i1 %or.cond514517.i, label %while.body85.i, label %if.end117.i 95 96 while.body85.i: ; preds = %while.body85.i, %while.body.i188 97 %aFreq.0518.i = phi i32 [ %add93.i, %while.body85.i ], [ 0, %while.body.i188 ] 98 %inc87.i = add nsw i32 0, 1 99 %tmp91.i = load i32* undef, align 4, !tbaa !0 100 %add93.i = add nsw i32 %tmp91.i, %aFreq.0518.i 101 %or.cond514.i = and i1 undef, false 102 br i1 %or.cond514.i, label %while.body85.i, label %while.end.i 103 104 while.end.i: ; preds = %while.body85.i 105 br i1 undef, label %land.lhs.true.i, label %if.end117.i 106 107 land.lhs.true.i: ; preds = %while.end.i 108 br i1 undef, label %land.lhs.true103.i, label %if.end117.i 109 110 land.lhs.true103.i: ; preds = %land.lhs.true.i 111 br i1 undef, label %if.then108.i, label %if.end117.i 112 113 if.then108.i: ; preds = %land.lhs.true103.i 114 br label %if.end117.i 115 116 if.end117.i: ; preds = %if.then108.i, %land.lhs.true103.i, %land.lhs.true.i, %while.end.i, %while.body.i188 117 %aFreq.1.i = phi i32 [ %aFreq.0518.i, %if.then108.i ], [ %add93.i, %land.lhs.true103.i ], [ %add93.i, %land.lhs.true.i ], [ %add93.i, %while.end.i ], [ 0, %while.body.i188 ] 118 %ge.1.i = phi i32 [ 0, %if.then108.i ], [ %inc87.i, %land.lhs.true103.i ], [ %inc87.i, %land.lhs.true.i ], [ %inc87.i, %while.end.i ], [ 0, %while.body.i188 ] 119 br i1 undef, label %if.then122.i, label %for.cond138.preheader.i 120 121 if.then122.i: ; preds = %if.end117.i 122 call void (...)* @fprintf(i32 undef, i32 %gs.0526.i, i32 %ge.1.i, i32 %aFreq.1.i, double undef) nounwind 123 br label %for.cond138.preheader.i 124 125 for.cond138.preheader.i: ; preds = %if.then122.i, %if.end117.i 126 br i1 undef, label %for.body143.lr.ph.i, label %for.end173.i 127 128 for.body143.lr.ph.i: ; preds = %for.cond138.preheader.i 129 br label %for.body143.i 130 131 for.body143.i: ; preds = %for.body143.i, %for.body143.lr.ph.i 132 br i1 undef, label %for.end173.i, label %for.body143.i 133 134 for.end173.i: ; preds = %for.body143.i, %for.cond138.preheader.i 135 %add177.i = add nsw i32 %ge.1.i, 1 136 %cmp73.i = icmp sgt i32 undef, 0 137 br i1 %cmp73.i, label %while.body.i188, label %for.cond182.preheader.i 138 139 for.inc220.us.i: ; preds = %for.cond182.preheader.i 140 unreachable 141 142 while.body300.preheader.i: ; preds = %for.cond182.preheader.i 143 br i1 undef, label %for.end335.i, label %while.end2742.i 144 145 for.end335.i: ; preds = %for.end2039.i, %while.body300.preheader.i 146 br label %for.body2021.i 147 148 for.body2021.i: ; preds = %for.body2021.i, %for.end335.i 149 br i1 undef, label %for.body2021.i, label %for.end2039.i 150 151 for.end2039.i: ; preds = %for.body2021.i 152 br label %for.end335.i 153 154 while.end2742.i: ; preds = %while.body300.preheader.i 155 br i1 undef, label %if.then2748.i, label %for.body2778.i 156 157 if.then2748.i: ; preds = %while.end2742.i 158 unreachable 159 160 for.body2778.i: ; preds = %while.end2742.i 161 unreachable 162 163 for.inc27.us.5.i: ; preds = %if.end.i 164 br label %for.end30.i 165 166 if.end85: ; preds = %entry 167 ret void 168 } 169 170 declare void @fprintf(...) nounwind 171 172 !0 = metadata !{metadata !"int", metadata !1} 173 !1 = metadata !{metadata !"omnipotent char", metadata !2} 174 !2 = metadata !{metadata !"Simple C/C++ TBAA", null} 175
