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1; RUN: llc %s -o - | FileCheck %s2; This file checks some weird corner case in LiveRangeEdit.3; We used to do crash when we eliminate the definition4; of the product of splitting when the original live-range5; has already been removed.6; Basically, we have the following input.7; v1 = loadimm cst8; ...9; = use v110;11; We split the live-range like this:12; v1 = loadimm cst13; ...14; v2 = copy v115; ...16; = use v217;18; We actually issue loadimm instead of the copy:19; v1 = loadimm cst20; ...21; v2 = loadimm cst 22; ...23; = use v224;25; v1 is now dead so we remove its live-range.26; Actually, we shrink it to empty to keep the27; instruction around for futher remat opportunities28; (accessbile via the origin pointer.)29;30; Later v2 gets remove as well (e.g., because we31; remat it closer to its use) and the live-range32; gets eliminated. We used to crash at this point33; because we were looking for a VNI of origin (v1)34; at the slot index of the definition of v2. However,35; we do not have a VNI for v1 at this point, since the36; live-range is now empty... crash!37; PR2798338 39source_filename = "bugpoint-output-1e29d28.bc"40target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"41target triple = "i386-unknown-linux-gnu"42 43@r = external global i32, align 444@k = external global i32, align 445@g = external global i32, align 446@a = external global i16, align 247@p = external global i32, align 448@n = external global i16, align 249@.str = external unnamed_addr constant [12 x i8], align 150@.str.1 = external unnamed_addr constant [13 x i8], align 151@s = external global i32, align 452@z = external global i16, align 253 54; CHECK-LABEL: fn1:55define void @fn1() #0 {56entry:57 br label %for.cond58 59for.cond: ; preds = %cleanup100, %for.end29, %entry60 %t7.0 = phi i16 [ undef, %entry ], [ %t7.1, %for.end29 ], [ %t7.19, %cleanup100 ]61 %t9.0 = phi i32 [ undef, %entry ], [ %t9.1, %for.end29 ], [ 0, %cleanup100 ]62 %t2.0 = phi i32 [ undef, %entry ], [ undef, %for.end29 ], [ %t2.18, %cleanup100 ]63 %tmp = load i32, ptr @r, align 464 br i1 undef, label %if.then, label %if.end765 66if.then: ; preds = %for.cond67 %tobool = icmp ne i32 %tmp, 068 %tobool1 = icmp ne i32 %t2.0, 069 %tmp1 = and i1 %tobool1, %tobool70 %land.ext = zext i1 %tmp1 to i3271 %tmp2 = load i32, ptr @k, align 472 %shr = lshr i32 %land.ext, %tmp273 %tobool4 = icmp ne i32 %shr, 074 %or.cond = and i1 false, %tobool475 br i1 %or.cond, label %L6, label %if.end776 77if.end7: ; preds = %if.then, %for.cond78 %t2.1 = phi i32 [ %shr, %if.then ], [ %t2.0, %for.cond ]79 %tobool8 = icmp eq i32 undef, 080 br i1 %tobool8, label %if.end11, label %for.cond1081 82for.cond10: ; preds = %for.cond10, %if.end783 br label %for.cond1084 85if.end11: ; preds = %if.end786 %tmp3 = load i32, ptr @g, align 487 %tmp4 = load i16, ptr @a, align 288 %conv = sext i16 %tmp4 to i3289 %div = sdiv i32 %tmp3, %conv90 %tobool12 = icmp eq i32 %div, 091 br i1 %tobool12, label %for.cond15, label %L592 93for.cond15: ; preds = %for.cond17, %if.end1194 %t7.1 = phi i16 [ %t7.2, %for.cond17 ], [ %t7.0, %if.end11 ]95 %t9.1 = phi i32 [ %t9.2, %for.cond17 ], [ %t9.0, %if.end11 ]96 %tobool16 = icmp eq i32 undef, 097 br i1 %tobool16, label %for.end29, label %for.cond1798 99for.cond17: ; preds = %for.cond20, %for.cond15100 %t7.2 = phi i16 [ %t7.3, %for.cond20 ], [ %t7.1, %for.cond15 ]101 %t9.2 = phi i32 [ undef, %for.cond20 ], [ %t9.1, %for.cond15 ]102 %tobool18 = icmp eq i8 undef, 0103 br i1 %tobool18, label %for.cond15, label %for.cond20104 105for.cond20: ; preds = %for.cond23, %for.cond17106 %t7.3 = phi i16 [ %t7.4, %for.cond23 ], [ %t7.2, %for.cond17 ]107 %tobool21 = icmp eq i32 undef, 0108 br i1 %tobool21, label %for.cond17, label %for.cond23109 110for.cond23: ; preds = %L1, %for.cond20111 %t7.4 = phi i16 [ %t7.5, %L1 ], [ %t7.3, %for.cond20 ]112 %tobool24 = icmp eq i8 undef, 0113 br i1 %tobool24, label %for.cond20, label %L1114 115L1: ; preds = %cleanup100, %for.cond23116 %t7.5 = phi i16 [ %t7.19, %cleanup100 ], [ %t7.4, %for.cond23 ]117 %conv26 = sext i16 undef to i64118 br label %for.cond23119 120for.end29: ; preds = %for.cond15121 br i1 undef, label %for.cond, label %for.cond32thread-pre-split122 123for.cond32thread-pre-split: ; preds = %for.end29124 %.pr = load i32, ptr @p, align 4125 br label %for.cond32126 127for.cond32: ; preds = %for.inc94, %for.cond32thread-pre-split128 %t7.6 = phi i16 [ %t7.1, %for.cond32thread-pre-split ], [ %t7.17, %for.inc94 ]129 %t3.4 = phi i64 [ 0, %for.cond32thread-pre-split ], [ 0, %for.inc94 ]130 %t9.6 = phi i32 [ %t9.1, %for.cond32thread-pre-split ], [ 0, %for.inc94 ]131 %t2.7 = phi i32 [ undef, %for.cond32thread-pre-split ], [ %t2.16, %for.inc94 ]132 %tobool33 = icmp eq i32 0, 0133 br i1 %tobool33, label %for.end95, label %for.body34134 135for.body34: ; preds = %for.cond32136 %tobool35 = icmp eq i16 undef, 0137 br i1 %tobool35, label %for.inc94, label %if.then36138 139if.then36: ; preds = %for.body34140 %tmp5 = load i16, ptr @n, align 2141 %tobool37 = icmp eq i32 undef, 0142 br i1 %tobool37, label %if.end78, label %if.then38143 144if.then38: ; preds = %if.then36145 tail call void (ptr, ...) @printf(ptr @.str, i64 undef)146 %tobool40 = icmp eq i32 undef, 0147 br i1 %tobool40, label %L3, label %cleanup100148 149L3: ; preds = %while.end.split, %if.then38150 %t7.7 = phi i16 [ %tmp5, %if.then38 ], [ %t7.15, %while.end.split ]151 %t3.5 = phi i64 [ %t3.4, %if.then38 ], [ %t3.11, %while.end.split ]152 %t2.8 = phi i32 [ %t2.7, %if.then38 ], [ %t2.14, %while.end.split ]153 %tobool43 = icmp eq i32 undef, 0154 br i1 %tobool43, label %if.end48, label %cleanup75155 156if.end48: ; preds = %L3157 tail call void (ptr, ...) @printf(ptr @.str.1, i64 %t3.5)158 br i1 undef, label %if.end61, label %for.cond52.preheader159 160for.cond52.preheader: ; preds = %if.end48161 %tobool57 = icmp eq i16 undef, 0162 %.130 = select i1 %tobool57, i16 -8, i16 0163 br label %if.end61164 165if.end61: ; preds = %for.cond52.preheader, %if.end48166 %t7.9 = phi i16 [ %t7.7, %if.end48 ], [ %.130, %for.cond52.preheader ]167 %tobool62 = icmp eq i32 undef, 0168 br i1 %tobool62, label %if.end71, label %if.then63169 170if.then63: ; preds = %if.end61171 br i1 undef, label %if.end67, label %L5172 173L5: ; preds = %cleanup100.L5_crit_edge, %if.then63, %if.end11174 %.pre = phi i32 [ %.pre.pre, %cleanup100.L5_crit_edge ], [ undef, %if.then63 ], [ %tmp, %if.end11 ]175 %t7.10 = phi i16 [ %t7.19, %cleanup100.L5_crit_edge ], [ %t7.9, %if.then63 ], [ %t7.0, %if.end11 ]176 %t3.6 = phi i64 [ 0, %cleanup100.L5_crit_edge ], [ %t3.5, %if.then63 ], [ 2, %if.end11 ]177 %t9.8 = phi i32 [ 0, %cleanup100.L5_crit_edge ], [ undef, %if.then63 ], [ %t9.0, %if.end11 ]178 %t2.9 = phi i32 [ %t2.18, %cleanup100.L5_crit_edge ], [ %t2.8, %if.then63 ], [ %t2.1, %if.end11 ]179 store i32 %t9.8, ptr @s, align 4180 br label %if.end67181 182if.end67: ; preds = %L5, %if.then63183 %tmp6 = phi i32 [ %.pre, %L5 ], [ undef, %if.then63 ]184 %t7.11 = phi i16 [ %t7.10, %L5 ], [ %t7.9, %if.then63 ]185 %t3.7 = phi i64 [ %t3.6, %L5 ], [ %t3.5, %if.then63 ]186 %t9.9 = phi i32 [ %t9.8, %L5 ], [ undef, %if.then63 ]187 %t2.10 = phi i32 [ %t2.9, %L5 ], [ %t2.8, %if.then63 ]188 %tobool68 = icmp eq i32 %tmp6, 0189 br i1 %tobool68, label %if.end71, label %for.end95190 191if.end71: ; preds = %if.end67, %if.end61192 %t7.12 = phi i16 [ %t7.11, %if.end67 ], [ %t7.9, %if.end61 ]193 %t3.8 = phi i64 [ %t3.7, %if.end67 ], [ %t3.5, %if.end61 ]194 %tobool72 = icmp eq i32 undef, 0195 br i1 %tobool72, label %cleanup75.thread128, label %if.then73196 197if.then73: ; preds = %if.end71198 br label %cleanup100199 200cleanup75.thread128: ; preds = %if.end71201 br label %if.end78202 203cleanup75: ; preds = %L3204 br i1 false, label %for.cond98, label %for.end95205 206if.end78: ; preds = %cleanup75.thread128, %if.then36207 %t7.14 = phi i16 [ %tmp5, %if.then36 ], [ 0, %cleanup75.thread128 ]208 %t3.10 = phi i64 [ %t3.4, %if.then36 ], [ %t3.8, %cleanup75.thread128 ]209 %t9.12 = phi i32 [ %t9.6, %if.then36 ], [ undef, %cleanup75.thread128 ]210 %t2.13 = phi i32 [ %t2.7, %if.then36 ], [ undef, %cleanup75.thread128 ]211 store i16 %t7.14, ptr @z, align 2212 br label %L6213 214L6: ; preds = %if.end78, %if.then215 %t7.15 = phi i16 [ %t7.0, %if.then ], [ %t7.14, %if.end78 ]216 %t3.11 = phi i64 [ 2, %if.then ], [ %t3.10, %if.end78 ]217 %t9.13 = phi i32 [ %t9.0, %if.then ], [ %t9.12, %if.end78 ]218 %t2.14 = phi i32 [ %shr, %if.then ], [ %t2.13, %if.end78 ]219 br i1 undef, label %while.condthread-pre-split, label %for.inc94220 221while.condthread-pre-split: ; preds = %L6222 %tobool83 = icmp eq i32 undef, 0223 br i1 %tobool83, label %while.end.split, label %while.cond224 225while.cond: ; preds = %while.cond, %while.condthread-pre-split226 br label %while.cond227 228while.end.split: ; preds = %while.condthread-pre-split229 %tobool84 = icmp eq i16 undef, 0230 br i1 %tobool84, label %for.inc94, label %L3231 232for.inc94: ; preds = %while.end.split, %L6, %for.body34233 %t7.17 = phi i16 [ %t7.6, %for.body34 ], [ %t7.15, %L6 ], [ %t7.15, %while.end.split ]234 %t2.16 = phi i32 [ %t2.7, %for.body34 ], [ %t2.14, %L6 ], [ %t2.14, %while.end.split ]235 store i32 undef, ptr @p, align 4236 br label %for.cond32237 238for.end95: ; preds = %cleanup75, %if.end67, %for.cond32239 %t7.18 = phi i16 [ %t7.6, %for.cond32 ], [ %t7.7, %cleanup75 ], [ %t7.11, %if.end67 ]240 %t2.17 = phi i32 [ %t2.7, %for.cond32 ], [ %t2.8, %cleanup75 ], [ %t2.10, %if.end67 ]241 %tobool96 = icmp eq i32 undef, 0242 br i1 %tobool96, label %cleanup100, label %for.cond98243 244for.cond98: ; preds = %for.cond98, %for.end95, %cleanup75245 br label %for.cond98246 247cleanup100: ; preds = %for.end95, %if.then73, %if.then38248 %t7.19 = phi i16 [ %t7.18, %for.end95 ], [ %tmp5, %if.then38 ], [ %t7.12, %if.then73 ]249 %t2.18 = phi i32 [ %t2.17, %for.end95 ], [ %t2.7, %if.then38 ], [ undef, %if.then73 ]250 switch i32 undef, label %unreachable [251 i32 0, label %for.cond252 i32 17, label %L1253 i32 7, label %cleanup100.L5_crit_edge254 ]255 256cleanup100.L5_crit_edge: ; preds = %cleanup100257 %.pre.pre = load i32, ptr @r, align 4258 br label %L5259 260unreachable: ; preds = %cleanup100261 unreachable262}263 264; Function Attrs: nounwind265declare void @printf(ptr nocapture readonly, ...) #1266 267attributes #0 = { noreturn nounwind "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="pentium4" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "use-soft-float"="false" }268attributes #1 = { nounwind "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="pentium4" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "use-soft-float"="false" }269