; LLVM IR from tangjz/acm-icpc :: Summer_Training/2016-07-17/E - What is N - tjz.ll (Z7mod_powii)

; 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"

@p = external dso_local global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z7mod_powii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %6 = load i32, ptr @p, align 4, !tbaa !5
  %7 = srem i32 1, %6
  store i32 %7, ptr %5, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %26, %2
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = icmp sgt i32 %9, 0
  br i1 %10, label %11, label %38

11:                                               ; preds = %8
  %12 = load i32, ptr %4, align 4, !tbaa !5
  %13 = and i32 %12, 1
  %14 = icmp ne i32 %13, 0
  br i1 %14, label %15, label %25

15:                                               ; preds = %11
  %16 = load i32, ptr %5, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = load i32, ptr %3, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = mul nsw i64 %17, %19
  %21 = load i32, ptr @p, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = srem i64 %20, %22
  %24 = trunc i64 %23 to i32
  store i32 %24, ptr %5, align 4, !tbaa !5
  br label %25

25:                                               ; preds = %15, %11
  br label %26

26:                                               ; preds = %25
  %27 = load i32, ptr %4, align 4, !tbaa !5
  %28 = ashr i32 %27, 1
  store i32 %28, ptr %4, align 4, !tbaa !5
  %29 = load i32, ptr %3, align 4, !tbaa !5
  %30 = sext i32 %29 to i64
  %31 = load i32, ptr %3, align 4, !tbaa !5
  %32 = sext i32 %31 to i64
  %33 = mul nsw i64 %30, %32
  %34 = load i32, ptr @p, align 4, !tbaa !5
  %35 = sext i32 %34 to i64
  %36 = srem i64 %33, %35
  %37 = trunc i64 %36 to i32
  store i32 %37, ptr %3, align 4, !tbaa !5
  br label %8, !llvm.loop !9

38:                                               ; preds = %8
  %39 = load i32, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i32 %39
}

; 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 = { 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 #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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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"

@p = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef range(i32 -2147483647, -2147483648) i32 @_Z7mod_powii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = load i32, ptr @p, align 4, !tbaa !5
  %4 = srem i32 1, %3
  %5 = icmp sgt i32 %1, 0
  br i1 %5, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2
  %6 = sext i32 %3 to i64
  br label %7

7:                                                ; preds = %.lr.ph, %15
  %.012 = phi i32 [ %4, %.lr.ph ], [ %.1, %15 ]
  %.0811 = phi i32 [ %1, %.lr.ph ], [ %16, %15 ]
  %.0910 = phi i32 [ %0, %.lr.ph ], [ %19, %15 ]
  %8 = and i32 %.0811, 1
  %.not = icmp eq i32 %8, 0
  br i1 %.not, label %._crit_edge14, label %9

._crit_edge14:                                    ; preds = %7
  %.pre = sext i32 %.0910 to i64
  br label %15

9:                                                ; preds = %7
  %10 = sext i32 %.012 to i64
  %11 = sext i32 %.0910 to i64
  %12 = mul nsw i64 %10, %11
  %13 = srem i64 %12, %6
  %14 = trunc nsw i64 %13 to i32
  br label %15

15:                                               ; preds = %._crit_edge14, %9
  %.pre-phi = phi i64 [ %.pre, %._crit_edge14 ], [ %11, %9 ]
  %.1 = phi i32 [ %.012, %._crit_edge14 ], [ %14, %9 ]
  %16 = lshr i32 %.0811, 1
  %17 = mul nsw i64 %.pre-phi, %.pre-phi
  %18 = srem i64 %17, %6
  %19 = trunc nsw i64 %18 to i32
  %.not13 = icmp ult i32 %.0811, 2
  br i1 %.not13, label %._crit_edge, label %7, !llvm.loop !9

._crit_edge:                                      ; preds = %15, %2
  %.0.lcssa = phi i32 [ %4, %2 ], [ %.1, %15 ]
  ret i32 %.0.lcssa
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, 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" }

!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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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