; RUN: llc %s -o - | FileCheck %s ; This file checks some weird corner case in LiveRangeEdit. ; We used to do crash when we eliminate the definition ; of the product of splitting when the original live-range ; has already been removed. ; Basically, we have the following input. ; v1 = loadimm cst ; ... ; = use v1 ; ; We split the live-range like this: ; v1 = loadimm cst ; ... ; v2 = copy v1 ; ... ; = use v2 ; ; We actually issue loadimm instead of the copy: ; v1 = loadimm cst ; ... ; v2 = loadimm cst ; ... ; = use v2 ; ; v1 is now dead so we remove its live-range. ; Actually, we shrink it to empty to keep the ; instruction around for futher remat opportunities ; (accessbile via the origin pointer.) ; ; Later v2 gets remove as well (e.g., because we ; remat it closer to its use) and the live-range ; gets eliminated. We used to crash at this point ; because we were looking for a VNI of origin (v1) ; at the slot index of the definition of v2. However, ; we do not have a VNI for v1 at this point, since the ; live-range is now empty... crash! ; PR27983 source_filename = "bugpoint-output-1e29d28.bc" target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128" target triple = "i386-unknown-linux-gnu" @r = external global i32, align 4 @k = external global i32, align 4 @g = external global i32, align 4 @a = external global i16, align 2 @p = external global i32, align 4 @n = external global i16, align 2 @.str = external unnamed_addr constant [12 x i8], align 1 @.str.1 = external unnamed_addr constant [13 x i8], align 1 @s = external global i32, align 4 @z = external global i16, align 2 ; CHECK-LABEL: fn1: define void @fn1() #0 { entry: br label %for.cond for.cond: ; preds = %cleanup100, %for.end29, %entry %t7.0 = phi i16 [ undef, %entry ], [ %t7.1, %for.end29 ], [ %t7.19, %cleanup100 ] %t9.0 = phi i32 [ undef, %entry ], [ %t9.1, %for.end29 ], [ 0, %cleanup100 ] %t2.0 = phi i32 [ undef, %entry ], [ undef, %for.end29 ], [ %t2.18, %cleanup100 ] %tmp = load i32, i32* @r, align 4 br i1 undef, label %if.then, label %if.end7 if.then: ; preds = %for.cond %tobool = icmp ne i32 %tmp, 0 %tobool1 = icmp ne i32 %t2.0, 0 %tmp1 = and i1 %tobool1, %tobool %land.ext = zext i1 %tmp1 to i32 %tmp2 = load i32, i32* @k, align 4 %shr = lshr i32 %land.ext, %tmp2 %tobool4 = icmp ne i32 %shr, 0 %or.cond = and i1 false, %tobool4 br i1 %or.cond, label %L6, label %if.end7 if.end7: ; preds = %if.then, %for.cond %t2.1 = phi i32 [ %shr, %if.then ], [ %t2.0, %for.cond ] %tobool8 = icmp eq i32 undef, 0 br i1 %tobool8, label %if.end11, label %for.cond10 for.cond10: ; preds = %for.cond10, %if.end7 br label %for.cond10 if.end11: ; preds = %if.end7 %tmp3 = load i32, i32* @g, align 4 %tmp4 = load i16, i16* @a, align 2 %conv = sext i16 %tmp4 to i32 %div = sdiv i32 %tmp3, %conv %tobool12 = icmp eq i32 %div, 0 br i1 %tobool12, label %for.cond15, label %L5 for.cond15: ; preds = %for.cond17, %if.end11 %t7.1 = phi i16 [ %t7.2, %for.cond17 ], [ %t7.0, %if.end11 ] %t9.1 = phi i32 [ %t9.2, %for.cond17 ], [ %t9.0, %if.end11 ] %tobool16 = icmp eq i32 undef, 0 br i1 %tobool16, label %for.end29, label %for.cond17 for.cond17: ; preds = %for.cond20, %for.cond15 %t7.2 = phi i16 [ %t7.3, %for.cond20 ], [ %t7.1, %for.cond15 ] %t9.2 = phi i32 [ undef, %for.cond20 ], [ %t9.1, %for.cond15 ] %tobool18 = icmp eq i8 undef, 0 br i1 %tobool18, label %for.cond15, label %for.cond20 for.cond20: ; preds = %for.cond23, %for.cond17 %t7.3 = phi i16 [ %t7.4, %for.cond23 ], [ %t7.2, %for.cond17 ] %tobool21 = icmp eq i32 undef, 0 br i1 %tobool21, label %for.cond17, label %for.cond23 for.cond23: ; preds = %L1, %for.cond20 %t7.4 = phi i16 [ %t7.5, %L1 ], [ %t7.3, %for.cond20 ] %tobool24 = icmp eq i8 undef, 0 br i1 %tobool24, label %for.cond20, label %L1 L1: ; preds = %cleanup100, %for.cond23 %t7.5 = phi i16 [ %t7.19, %cleanup100 ], [ %t7.4, %for.cond23 ] %conv26 = sext i16 undef to i64 br label %for.cond23 for.end29: ; preds = %for.cond15 br i1 undef, label %for.cond, label %for.cond32thread-pre-split for.cond32thread-pre-split: ; preds = %for.end29 %.pr = load i32, i32* @p, align 4 br label %for.cond32 for.cond32: ; preds = %for.inc94, %for.cond32thread-pre-split %t7.6 = phi i16 [ %t7.1, %for.cond32thread-pre-split ], [ %t7.17, %for.inc94 ] %t3.4 = phi i64 [ 0, %for.cond32thread-pre-split ], [ 0, %for.inc94 ] %t9.6 = phi i32 [ %t9.1, %for.cond32thread-pre-split ], [ 0, %for.inc94 ] %t2.7 = phi i32 [ undef, %for.cond32thread-pre-split ], [ %t2.16, %for.inc94 ] %tobool33 = icmp eq i32 0, 0 br i1 %tobool33, label %for.end95, label %for.body34 for.body34: ; preds = %for.cond32 %tobool35 = icmp eq i16 undef, 0 br i1 %tobool35, label %for.inc94, label %if.then36 if.then36: ; preds = %for.body34 %tmp5 = load i16, i16* @n, align 2 %tobool37 = icmp eq i32 undef, 0 br i1 %tobool37, label %if.end78, label %if.then38 if.then38: ; preds = %if.then36 tail call void (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i32 0, i32 0), i64 undef) %tobool40 = icmp eq i32 undef, 0 br i1 %tobool40, label %L3, label %cleanup100 L3: ; preds = %while.end.split, %if.then38 %t7.7 = phi i16 [ %tmp5, %if.then38 ], [ %t7.15, %while.end.split ] %t3.5 = phi i64 [ %t3.4, %if.then38 ], [ %t3.11, %while.end.split ] %t2.8 = phi i32 [ %t2.7, %if.then38 ], [ %t2.14, %while.end.split ] %tobool43 = icmp eq i32 undef, 0 br i1 %tobool43, label %if.end48, label %cleanup75 if.end48: ; preds = %L3 tail call void (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i32 0, i32 0), i64 %t3.5) br i1 undef, label %if.end61, label %for.cond52.preheader for.cond52.preheader: ; preds = %if.end48 %tobool57 = icmp eq i16 undef, 0 %.130 = select i1 %tobool57, i16 -8, i16 0 br label %if.end61 if.end61: ; preds = %for.cond52.preheader, %if.end48 %t7.9 = phi i16 [ %t7.7, %if.end48 ], [ %.130, %for.cond52.preheader ] %tobool62 = icmp eq i32 undef, 0 br i1 %tobool62, label %if.end71, label %if.then63 if.then63: ; preds = %if.end61 br i1 undef, label %if.end67, label %L5 L5: ; preds = %cleanup100.L5_crit_edge, %if.then63, %if.end11 %.pre = phi i32 [ %.pre.pre, %cleanup100.L5_crit_edge ], [ undef, %if.then63 ], [ %tmp, %if.end11 ] %t7.10 = phi i16 [ %t7.19, %cleanup100.L5_crit_edge ], [ %t7.9, %if.then63 ], [ %t7.0, %if.end11 ] %t3.6 = phi i64 [ 0, %cleanup100.L5_crit_edge ], [ %t3.5, %if.then63 ], [ 2, %if.end11 ] %t9.8 = phi i32 [ 0, %cleanup100.L5_crit_edge ], [ undef, %if.then63 ], [ %t9.0, %if.end11 ] %t2.9 = phi i32 [ %t2.18, %cleanup100.L5_crit_edge ], [ %t2.8, %if.then63 ], [ %t2.1, %if.end11 ] store i32 %t9.8, i32* @s, align 4 br label %if.end67 if.end67: ; preds = %L5, %if.then63 %tmp6 = phi i32 [ %.pre, %L5 ], [ undef, %if.then63 ] %t7.11 = phi i16 [ %t7.10, %L5 ], [ %t7.9, %if.then63 ] %t3.7 = phi i64 [ %t3.6, %L5 ], [ %t3.5, %if.then63 ] %t9.9 = phi i32 [ %t9.8, %L5 ], [ undef, %if.then63 ] %t2.10 = phi i32 [ %t2.9, %L5 ], [ %t2.8, %if.then63 ] %tobool68 = icmp eq i32 %tmp6, 0 br i1 %tobool68, label %if.end71, label %for.end95 if.end71: ; preds = %if.end67, %if.end61 %t7.12 = phi i16 [ %t7.11, %if.end67 ], [ %t7.9, %if.end61 ] %t3.8 = phi i64 [ %t3.7, %if.end67 ], [ %t3.5, %if.end61 ] %tobool72 = icmp eq i32 undef, 0 br i1 %tobool72, label %cleanup75.thread128, label %if.then73 if.then73: ; preds = %if.end71 br label %cleanup100 cleanup75.thread128: ; preds = %if.end71 br label %if.end78 cleanup75: ; preds = %L3 br i1 false, label %for.cond98, label %for.end95 if.end78: ; preds = %cleanup75.thread128, %if.then36 %t7.14 = phi i16 [ %tmp5, %if.then36 ], [ 0, %cleanup75.thread128 ] %t3.10 = phi i64 [ %t3.4, %if.then36 ], [ %t3.8, %cleanup75.thread128 ] %t9.12 = phi i32 [ %t9.6, %if.then36 ], [ undef, %cleanup75.thread128 ] %t2.13 = phi i32 [ %t2.7, %if.then36 ], [ undef, %cleanup75.thread128 ] store i16 %t7.14, i16* @z, align 2 br label %L6 L6: ; preds = %if.end78, %if.then %t7.15 = phi i16 [ %t7.0, %if.then ], [ %t7.14, %if.end78 ] %t3.11 = phi i64 [ 2, %if.then ], [ %t3.10, %if.end78 ] %t9.13 = phi i32 [ %t9.0, %if.then ], [ %t9.12, %if.end78 ] %t2.14 = phi i32 [ %shr, %if.then ], [ %t2.13, %if.end78 ] br i1 undef, label %while.condthread-pre-split, label %for.inc94 while.condthread-pre-split: ; preds = %L6 %tobool83 = icmp eq i32 undef, 0 br i1 %tobool83, label %while.end.split, label %while.cond while.cond: ; preds = %while.cond, %while.condthread-pre-split br label %while.cond while.end.split: ; preds = %while.condthread-pre-split %tobool84 = icmp eq i16 undef, 0 br i1 %tobool84, label %for.inc94, label %L3 for.inc94: ; preds = %while.end.split, %L6, %for.body34 %t7.17 = phi i16 [ %t7.6, %for.body34 ], [ %t7.15, %L6 ], [ %t7.15, %while.end.split ] %t2.16 = phi i32 [ %t2.7, %for.body34 ], [ %t2.14, %L6 ], [ %t2.14, %while.end.split ] store i32 undef, i32* @p, align 4 br label %for.cond32 for.end95: ; preds = %cleanup75, %if.end67, %for.cond32 %t7.18 = phi i16 [ %t7.6, %for.cond32 ], [ %t7.7, %cleanup75 ], [ %t7.11, %if.end67 ] %t2.17 = phi i32 [ %t2.7, %for.cond32 ], [ %t2.8, %cleanup75 ], [ %t2.10, %if.end67 ] %tobool96 = icmp eq i32 undef, 0 br i1 %tobool96, label %cleanup100, label %for.cond98 for.cond98: ; preds = %for.cond98, %for.end95, %cleanup75 br label %for.cond98 cleanup100: ; preds = %for.end95, %if.then73, %if.then38 %t7.19 = phi i16 [ %t7.18, %for.end95 ], [ %tmp5, %if.then38 ], [ %t7.12, %if.then73 ] %t2.18 = phi i32 [ %t2.17, %for.end95 ], [ %t2.7, %if.then38 ], [ undef, %if.then73 ] switch i32 undef, label %unreachable [ i32 0, label %for.cond i32 17, label %L1 i32 7, label %cleanup100.L5_crit_edge ] cleanup100.L5_crit_edge: ; preds = %cleanup100 %.pre.pre = load i32, i32* @r, align 4 br label %L5 unreachable: ; preds = %cleanup100 unreachable } ; Function Attrs: nounwind declare void @printf(i8* nocapture readonly, ...) #1 attributes #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" "unsafe-fp-math"="false" "use-soft-float"="false" } attributes #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" "unsafe-fp-math"="false" "use-soft-float"="false" }