; LLVM IR from sslab-gatech/janus :: lkl/tools/perf/arch/arm/util (dwarf-regs)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.pt_regs_dwarfnum = type { ptr, i32 }

@regdwarfnum_table = external hidden constant [17 x %struct.pt_regs_dwarfnum], align 16

; Function Attrs: nounwind uwtable
define dso_local ptr @get_arch_regstr(i32 noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store ptr @regdwarfnum_table, ptr %4, align 8, !tbaa !9
  br label %6

6:                                                ; preds = %22, %1
  %7 = load ptr, ptr %4, align 8, !tbaa !9
  %8 = getelementptr inbounds %struct.pt_regs_dwarfnum, ptr %7, i32 0, i32 0
  %9 = load ptr, ptr %8, align 8, !tbaa !11
  %10 = icmp ne ptr %9, null
  br i1 %10, label %11, label %25

11:                                               ; preds = %6
  %12 = load ptr, ptr %4, align 8, !tbaa !9
  %13 = getelementptr inbounds %struct.pt_regs_dwarfnum, ptr %12, i32 0, i32 1
  %14 = load i32, ptr %13, align 8, !tbaa !13
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = icmp eq i32 %14, %15
  br i1 %16, label %17, label %21

17:                                               ; preds = %11
  %18 = load ptr, ptr %4, align 8, !tbaa !9
  %19 = getelementptr inbounds %struct.pt_regs_dwarfnum, ptr %18, i32 0, i32 0
  %20 = load ptr, ptr %19, align 8, !tbaa !11
  store ptr %20, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %26

21:                                               ; preds = %11
  br label %22

22:                                               ; preds = %21
  %23 = load ptr, ptr %4, align 8, !tbaa !9
  %24 = getelementptr inbounds %struct.pt_regs_dwarfnum, ptr %23, i32 1
  store ptr %24, ptr %4, align 8, !tbaa !9
  br label %6, !llvm.loop !14

25:                                               ; preds = %6
  store ptr null, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %26

26:                                               ; preds = %25, %17
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %27 = load ptr, ptr %2, align 8
  ret ptr %27
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"pt_regs_dwarfnum", !10, i64 0, !6, i64 8}
!13 = !{!12, !6, i64 8}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.pt_regs_dwarfnum = type { ptr, i32 }

@regdwarfnum_table = external hidden local_unnamed_addr constant [17 x %struct.pt_regs_dwarfnum], align 16

; Function Attrs: nofree norecurse nosync nounwind memory(none) uwtable
define dso_local ptr @get_arch_regstr(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load ptr, ptr @regdwarfnum_table, align 16, !tbaa !5
  %.not7 = icmp eq ptr %2, null
  br i1 %.not7, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1
  %3 = load i32, ptr getelementptr inbounds (i8, ptr @regdwarfnum_table, i64 8), align 8, !tbaa !11
  %4 = icmp eq i32 %3, %0
  br i1 %4, label %._crit_edge, label %.lr.ph12

.lr.ph12:                                         ; preds = %.lr.ph.preheader, %.lr.ph
  %.0811 = phi ptr [ %5, %.lr.ph ], [ @regdwarfnum_table, %.lr.ph.preheader ]
  %5 = getelementptr inbounds i8, ptr %.0811, i64 16
  %6 = load ptr, ptr %5, align 8, !tbaa !5
  %.not = icmp eq ptr %6, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !12

.lr.ph:                                           ; preds = %.lr.ph12
  %7 = getelementptr inbounds i8, ptr %.0811, i64 24
  %8 = load i32, ptr %7, align 8, !tbaa !11
  %9 = icmp eq i32 %8, %0
  br i1 %9, label %._crit_edge, label %.lr.ph12, !llvm.loop !12

._crit_edge:                                      ; preds = %.lr.ph12, %.lr.ph, %.lr.ph.preheader, %1
  %.lcssa = phi ptr [ null, %1 ], [ %2, %.lr.ph.preheader ], [ %6, %.lr.ph ], [ null, %.lr.ph12 ]
  ret ptr %.lcssa
}

attributes #0 = { nofree norecurse nosync nounwind memory(none) uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !7, i64 0}
!6 = !{!"pt_regs_dwarfnum", !7, i64 0, !10, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !10, i64 8}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass