# RUN: llc -march=hexagon -run-pass hwloops -o - %s | FileCheck %s

# This used to crash with `Assertion `isReg() && "This is not a register operand!"`
# CHECK: J2_loop0r

--- |
  target datalayout = "e-m:e-p:32:32:32-a:0-n16:32-i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048"
  target triple = "hexagon"

  %s.0 = type { i32 }

  @g0 = external dso_local local_unnamed_addr global ptr, align 4, !dbg !0

  define dso_local void @f0() local_unnamed_addr #0 !dbg !13 {
  b0:
    %v0 = sext i16 undef to i32
    br i1 undef, label %b2, label %b1

  b1:                                               ; preds = %b1, %b0
    %v1 = phi i32 [ %v2, %b1 ], [ undef, %b0 ]
    %v2 = add nsw i32 %v1, -8
    %v3 = add nsw i32 %v2, %v0
    call void @llvm.dbg.value(metadata i32 %v3, metadata !19, metadata !DIExpression()), !dbg !24
    %v4 = load ptr, ptr @g0, align 4
    %v5 = getelementptr inbounds %s.0, ptr %v4, i32 %v3, i32 0
    store i32 undef, ptr %v5, align 4
    %v6 = icmp eq i32 %v2, 0
    br i1 %v6, label %b2, label %b1

  b2:                                               ; preds = %b1, %b0
    ret void
  }

  declare void @llvm.dbg.value(metadata, metadata, metadata) #1

  attributes #0 = { "target-features"="+v66,-long-calls" }
  attributes #1 = { nofree nosync nounwind readnone speculatable willreturn }

  !llvm.dbg.cu = !{!2}
  !llvm.module.flags = !{!11, !12}

  !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
  !1 = distinct !DIGlobalVariable(name: "g0", scope: !2, file: !3, line: 3, type: !6, isLocal: false, isDefinition: true)
  !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 13.0.0 (https://github.com/llvm/llvm-project 93664503be6b3f47269cf617f8c46b6ce95f8076)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
  !3 = !DIFile(filename: "dev.i", directory: "/test")
  !4 = !{}
  !5 = !{!0}
  !6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 32)
  !7 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s.0", file: !3, line: 1, size: 32, elements: !8)
  !8 = !{!9}
  !9 = !DIDerivedType(tag: DW_TAG_member, name: "m", scope: !7, file: !3, line: 2, baseType: !10, size: 32)
  !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
  !11 = !{i32 2, !"Debug Info Version", i32 3}
  !12 = !{i32 7, !"frame-pointer", i32 2}
  !13 = distinct !DISubprogram(name: "f0", scope: !3, file: !3, line: 9, type: !14, scopeLine: 9, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !17)
  !14 = !DISubroutineType(types: !15)
  !15 = !{!10, !16}
  !16 = !DIBasicType(name: "unsigned short", size: 16, encoding: DW_ATE_unsigned)
  !17 = !{!18}
  !18 = !DILocalVariable(name: "x", arg: 1, scope: !13, file: !3, line: 9, type: !16)
  !19 = !DILocalVariable(name: "y", arg: 1, scope: !20, file: !3, line: 6, type: !10)
  !20 = distinct !DISubprogram(name: "f1", scope: !3, file: !3, line: 6, type: !21, scopeLine: 6, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !23)
  !21 = !DISubroutineType(types: !22)
  !22 = !{!6, !10}
  !23 = !{!19}
  !24 = !DILocation(line: 0, scope: !20, inlinedAt: !25)
  !25 = distinct !DILocation(line: 11, column: 5, scope: !13)

...

---
name:              f0
tracksRegLiveness: true
body: |
  bb.0.b0:
    successors: %bb.2(0x40000000), %bb.3(0x40000000); %bb.2(50.00%), %bb.3(50.00%)

    %6:predregs = IMPLICIT_DEF
    J2_jumpt %6:predregs, %bb.2, implicit-def $pc

  bb.3:
    successors: %bb.1(0x80000000); %bb.1(100.00%)

    %5:intregs = IMPLICIT_DEF
    %4:intregs = A2_tfrsi 0

  bb.1.b1:
    successors: %bb.2(0x04000000), %bb.1(0x7c000000); %bb.2(3.12%), %bb.1(96.88%)

    %0:intregs = PHI %4:intregs, %bb.3, %3:intregs, %bb.1
    %1:intregs = PHI %5:intregs, %bb.3, %2:intregs, %bb.1
    %2:intregs = nsw A2_addi %1:intregs, -8
    DBG_VALUE_LIST !19, !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_plus, DW_OP_stack_value), %2:intregs, 0, debug-location !24
    %3:intregs = A2_addi %0:intregs, -32
    %7:predregs = C2_cmpeqi %2:intregs, 0
    J2_jumpf %7:predregs, %bb.1, implicit-def dead $pc
    J2_jump %bb.2, implicit-def dead $pc

  bb.2.b2:
    PS_jmpret $r31, implicit-def dead $pc
...