; LLVM IR from upupming/algorithm :: acwing/寒假每日一题（提高组）/week1/1402. 星空之夜.ll (Z6get_idd)

; 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"

@id = external dso_local global i32, align 4
@_ZZ6get_iddE4hash = external hidden global [30 x double], align 16

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef signext i8 @_Z6get_idd(double noundef %0) #1 {
  %2 = alloca i8, align 1
  %3 = alloca double, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store double %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 0, ptr %4, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %25, %1
  %7 = load i32, ptr %4, align 4, !tbaa !9
  %8 = load i32, ptr @id, align 4, !tbaa !9
  %9 = icmp slt i32 %7, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %6
  store i32 2, ptr %5, align 4
  br label %28

11:                                               ; preds = %6
  %12 = load i32, ptr %4, align 4, !tbaa !9
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [30 x double], ptr @_ZZ6get_iddE4hash, i64 0, i64 %13
  %15 = load double, ptr %14, align 8, !tbaa !5
  %16 = load double, ptr %3, align 8, !tbaa !5
  %17 = fsub double %15, %16
  %18 = call double @llvm.fabs.f64(double %17)
  %19 = fcmp olt double %18, 0x3EB0C6F7A0B5ED8D
  br i1 %19, label %20, label %24

20:                                               ; preds = %11
  %21 = load i32, ptr %4, align 4, !tbaa !9
  %22 = add nsw i32 %21, 97
  %23 = trunc i32 %22 to i8
  store i8 %23, ptr %2, align 1
  store i32 1, ptr %5, align 4
  br label %28

24:                                               ; preds = %11
  br label %25

25:                                               ; preds = %24
  %26 = load i32, ptr %4, align 4, !tbaa !9
  %27 = add nsw i32 %26, 1
  store i32 %27, ptr %4, align 4, !tbaa !9
  br label %6, !llvm.loop !11

28:                                               ; preds = %20, %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  %29 = load i32, ptr %5, align 4
  switch i32 %29, label %42 [
    i32 2, label %30
    i32 1, label %40
  ]

30:                                               ; preds = %28
  %31 = load double, ptr %3, align 8, !tbaa !5
  %32 = load i32, ptr @id, align 4, !tbaa !9
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr @id, align 4, !tbaa !9
  %34 = sext i32 %32 to i64
  %35 = getelementptr inbounds [30 x double], ptr @_ZZ6get_iddE4hash, i64 0, i64 %34
  store double %31, ptr %35, align 8, !tbaa !5
  %36 = load i32, ptr @id, align 4, !tbaa !9
  %37 = sub nsw i32 %36, 1
  %38 = add nsw i32 %37, 97
  %39 = trunc i32 %38 to i8
  store i8 %39, ptr %2, align 1
  br label %40

40:                                               ; preds = %30, %28
  %41 = load i8, ptr %2, align 1
  ret i8 %41

42:                                               ; preds = %28
  unreachable
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.fabs.f64(double) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 #2 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #3 = { 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 = !{!"double", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

@id = external dso_local local_unnamed_addr global i32, align 4
@_ZZ6get_iddE4hash = external hidden local_unnamed_addr global [30 x double], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef signext i8 @_Z6get_idd(double noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @id, align 4, !tbaa !5
  %3 = icmp sgt i32 %2, 0
  br i1 %3, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %1
  %wide.trip.count = zext nneg i32 %2 to i64
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %9
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %9 ]
  %4 = getelementptr inbounds [30 x double], ptr @_ZZ6get_iddE4hash, i64 0, i64 %indvars.iv
  %5 = load double, ptr %4, align 8, !tbaa !9
  %6 = fsub double %5, %0
  %7 = tail call double @llvm.fabs.f64(double %6)
  %8 = fcmp olt double %7, 0x3EB0C6F7A0B5ED8D
  br i1 %8, label %.loopexit.loopexit, label %9

9:                                                ; preds = %.lr.ph
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11

._crit_edge:                                      ; preds = %9, %1
  %10 = add nsw i32 %2, 1
  store i32 %10, ptr @id, align 4, !tbaa !5
  %11 = sext i32 %2 to i64
  %12 = getelementptr inbounds [30 x double], ptr @_ZZ6get_iddE4hash, i64 0, i64 %11
  store double %0, ptr %12, align 8, !tbaa !9
  br label %.loopexit

.loopexit.loopexit:                               ; preds = %.lr.ph
  %13 = trunc nuw nsw i64 %indvars.iv to i32
  br label %.loopexit

.loopexit:                                        ; preds = %.loopexit.loopexit, %._crit_edge
  %.1.in.in = phi i32 [ %2, %._crit_edge ], [ %13, %.loopexit.loopexit ]
  %.1.in = trunc i32 %.1.in.in to i8
  %.1 = add i8 %.1.in, 97
  ret i8 %.1
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.fabs.f64(double) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: 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" }
attributes #1 = { mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"double", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass