; LLVM IR from chirag-singhal/Coding-Interview-101 :: Miscellaneous/InterviewBit/Maths/gcd.ll (Z3gcdii)

; 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"

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z3gcdii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = icmp eq i32 %9, 0
  br i1 %10, label %11, label %13

11:                                               ; preds = %2
  %12 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %12, ptr %3, align 4
  br label %44

13:                                               ; preds = %2
  %14 = load i32, ptr %5, align 4, !tbaa !5
  %15 = icmp eq i32 %14, 0
  br i1 %15, label %16, label %18

16:                                               ; preds = %13
  %17 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %17, ptr %3, align 4
  br label %44

18:                                               ; preds = %13
  br label %19

19:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = load i32, ptr %5, align 4, !tbaa !5
  %22 = icmp sgt i32 %20, %21
  br i1 %22, label %23, label %26

23:                                               ; preds = %19
  %24 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %24, ptr %6, align 4, !tbaa !5
  %25 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %25, ptr %7, align 4, !tbaa !5
  br label %29

26:                                               ; preds = %19
  %27 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %27, ptr %6, align 4, !tbaa !5
  %28 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %28, ptr %7, align 4, !tbaa !5
  br label %29

29:                                               ; preds = %26, %23
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %30 = load i32, ptr %6, align 4, !tbaa !5
  %31 = load i32, ptr %7, align 4, !tbaa !5
  %32 = srem i32 %30, %31
  store i32 %32, ptr %8, align 4, !tbaa !5
  br label %33

33:                                               ; preds = %36, %29
  %34 = load i32, ptr %8, align 4, !tbaa !5
  %35 = icmp ne i32 %34, 0
  br i1 %35, label %36, label %42

36:                                               ; preds = %33
  %37 = load i32, ptr %7, align 4, !tbaa !5
  store i32 %37, ptr %6, align 4, !tbaa !5
  %38 = load i32, ptr %8, align 4, !tbaa !5
  store i32 %38, ptr %7, align 4, !tbaa !5
  %39 = load i32, ptr %6, align 4, !tbaa !5
  %40 = load i32, ptr %7, align 4, !tbaa !5
  %41 = srem i32 %39, %40
  store i32 %41, ptr %8, align 4, !tbaa !5
  br label %33, !llvm.loop !9

42:                                               ; preds = %33
  %43 = load i32, ptr %7, align 4, !tbaa !5
  store i32 %43, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %44

44:                                               ; preds = %42, %16, %11
  %45 = load i32, ptr %3, align 4
  ret i32 %45
}

; 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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i32 @_Z3gcdii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq i32 %0, 0
  br i1 %3, label %.loopexit, label %4

4:                                                ; preds = %2
  %5 = icmp eq i32 %1, 0
  br i1 %5, label %.loopexit, label %6

6:                                                ; preds = %4
  %. = tail call i32 @llvm.smax.i32(i32 %0, i32 %1)
  %.24 = tail call i32 @llvm.smin.i32(i32 %0, i32 %1)
  %7 = srem i32 %., %.24
  %.not25 = icmp eq i32 %7, 0
  br i1 %.not25, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %6, %.lr.ph
  %.027 = phi i32 [ %8, %.lr.ph ], [ %7, %6 ]
  %.126 = phi i32 [ %.027, %.lr.ph ], [ %.24, %6 ]
  %8 = srem i32 %.126, %.027
  %.not = icmp eq i32 %8, 0
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !5

.loopexit:                                        ; preds = %.lr.ph, %6, %4, %2
  %.021 = phi i32 [ %1, %2 ], [ %0, %4 ], [ %.24, %6 ], [ %.027, %.lr.ph ]
  ret i32 %.021
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smin.i32(i32, i32) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn 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" }
attributes #1 = { 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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