; LLVM IR from DimitrisJim/leetcode_solutions :: C/Algorithms (1979)

; 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: nounwind uwtable
define dso_local i32 @findGCD(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %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
  %9 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 1001, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %33, %2
  %11 = load i32, ptr %7, align 4, !tbaa !9
  %12 = load i32, ptr %4, align 4, !tbaa !9
  %13 = icmp slt i32 %11, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %36

15:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = load i32, ptr %7, align 4, !tbaa !9
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds i32, ptr %16, i64 %18
  %20 = load i32, ptr %19, align 4, !tbaa !9
  store i32 %20, ptr %8, align 4, !tbaa !9
  %21 = load i32, ptr %8, align 4, !tbaa !9
  %22 = load i32, ptr %6, align 4, !tbaa !9
  %23 = icmp sgt i32 %21, %22
  br i1 %23, label %24, label %26

24:                                               ; preds = %15
  %25 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %25, ptr %6, align 4, !tbaa !9
  br label %26

26:                                               ; preds = %24, %15
  %27 = load i32, ptr %8, align 4, !tbaa !9
  %28 = load i32, ptr %5, align 4, !tbaa !9
  %29 = icmp slt i32 %27, %28
  br i1 %29, label %30, label %32

30:                                               ; preds = %26
  %31 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %31, ptr %5, align 4, !tbaa !9
  br label %32

32:                                               ; preds = %30, %26
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %33

33:                                               ; preds = %32
  %34 = load i32, ptr %7, align 4, !tbaa !9
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %7, align 4, !tbaa !9
  br label %10, !llvm.loop !11

36:                                               ; preds = %14
  br label %37

37:                                               ; preds = %40, %36
  %38 = load i32, ptr %5, align 4, !tbaa !9
  %39 = icmp ne i32 %38, 0
  br i1 %39, label %40, label %46

40:                                               ; preds = %37
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %41 = load i32, ptr %5, align 4, !tbaa !9
  store i32 %41, ptr %9, align 4, !tbaa !9
  %42 = load i32, ptr %6, align 4, !tbaa !9
  %43 = load i32, ptr %5, align 4, !tbaa !9
  %44 = srem i32 %42, %43
  store i32 %44, ptr %5, align 4, !tbaa !9
  %45 = load i32, ptr %9, align 4, !tbaa !9
  store i32 %45, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  br label %37, !llvm.loop !13

46:                                               ; preds = %37
  %47 = load i32, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i32 %47
}

; 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local i32 @findGCD(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp sgt i32 %1, 0
  br i1 %3, label %.lr.ph.preheader, label %.lr.ph29.preheader

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = zext nneg i32 %1 to i64
  %min.iters.check = icmp ult i32 %1, 8
  br i1 %min.iters.check, label %.lr.ph.preheader43, label %vector.ph

.lr.ph.preheader43:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  %.024.ph = phi i32 [ 1001, %.lr.ph.preheader ], [ %11, %middle.block ]
  %.01623.ph = phi i32 [ 0, %.lr.ph.preheader ], [ %12, %middle.block ]
  br label %.lr.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %wide.trip.count, 2147483640
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <4 x i32> [ <i32 1001, i32 1001, i32 1001, i32 1001>, %vector.ph ], [ %8, %vector.body ]
  %vec.phi37 = phi <4 x i32> [ <i32 1001, i32 1001, i32 1001, i32 1001>, %vector.ph ], [ %9, %vector.body ]
  %vec.phi38 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %6, %vector.body ]
  %vec.phi39 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %7, %vector.body ]
  %4 = getelementptr inbounds i32, ptr %0, i64 %index
  %5 = getelementptr inbounds i8, ptr %4, i64 16
  %wide.load = load <4 x i32>, ptr %4, align 4, !tbaa !5
  %wide.load40 = load <4 x i32>, ptr %5, align 4, !tbaa !5
  %6 = tail call <4 x i32> @llvm.smax.v4i32(<4 x i32> %wide.load, <4 x i32> %vec.phi38)
  %7 = tail call <4 x i32> @llvm.smax.v4i32(<4 x i32> %wide.load40, <4 x i32> %vec.phi39)
  %8 = tail call <4 x i32> @llvm.smin.v4i32(<4 x i32> %wide.load, <4 x i32> %vec.phi)
  %9 = tail call <4 x i32> @llvm.smin.v4i32(<4 x i32> %wide.load40, <4 x i32> %vec.phi37)
  %index.next = add nuw i64 %index, 8
  %10 = icmp eq i64 %index.next, %n.vec
  br i1 %10, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %rdx.minmax = tail call <4 x i32> @llvm.smin.v4i32(<4 x i32> %8, <4 x i32> %9)
  %11 = tail call i32 @llvm.vector.reduce.smin.v4i32(<4 x i32> %rdx.minmax)
  %rdx.minmax41 = tail call <4 x i32> @llvm.smax.v4i32(<4 x i32> %6, <4 x i32> %7)
  %12 = tail call i32 @llvm.vector.reduce.smax.v4i32(<4 x i32> %rdx.minmax41)
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %.preheader, label %.lr.ph.preheader43

.preheader:                                       ; preds = %.lr.ph, %middle.block
  %spec.select.lcssa = phi i32 [ %12, %middle.block ], [ %spec.select, %.lr.ph ]
  %.1.lcssa = phi i32 [ %11, %middle.block ], [ %.1, %.lr.ph ]
  %.not26 = icmp eq i32 %.1.lcssa, 0
  br i1 %.not26, label %._crit_edge, label %.lr.ph29.preheader

.lr.ph29.preheader:                               ; preds = %2, %.preheader
  %.228.ph = phi i32 [ 1001, %2 ], [ %.1.lcssa, %.preheader ]
  %.21827.ph = phi i32 [ 0, %2 ], [ %spec.select.lcssa, %.preheader ]
  br label %.lr.ph29

.lr.ph:                                           ; preds = %.lr.ph.preheader43, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %indvars.iv.ph, %.lr.ph.preheader43 ]
  %.024 = phi i32 [ %.1, %.lr.ph ], [ %.024.ph, %.lr.ph.preheader43 ]
  %.01623 = phi i32 [ %spec.select, %.lr.ph ], [ %.01623.ph, %.lr.ph.preheader43 ]
  %13 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %spec.select = tail call i32 @llvm.smax.i32(i32 %14, i32 %.01623)
  %.1 = tail call i32 @llvm.smin.i32(i32 %14, i32 %.024)
  %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 %.preheader, label %.lr.ph, !llvm.loop !13

.lr.ph29:                                         ; preds = %.lr.ph29.preheader, %.lr.ph29
  %.228 = phi i32 [ %15, %.lr.ph29 ], [ %.228.ph, %.lr.ph29.preheader ]
  %.21827 = phi i32 [ %.228, %.lr.ph29 ], [ %.21827.ph, %.lr.ph29.preheader ]
  %15 = srem i32 %.21827, %.228
  %.not = icmp eq i32 %15, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph29, !llvm.loop !14

._crit_edge:                                      ; preds = %.lr.ph29, %.preheader
  %.218.lcssa = phi i32 [ %spec.select.lcssa, %.preheader ], [ %.228, %.lr.ph29 ]
  ret i32 %.218.lcssa
}

; 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

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare <4 x i32> @llvm.smax.v4i32(<4 x i32>, <4 x i32>) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare <4 x i32> @llvm.smin.v4i32(<4 x i32>, <4 x i32>) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.vector.reduce.smin.v4i32(<4 x i32>) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.vector.reduce.smax.v4i32(<4 x i32>) #1

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: read) 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 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !12, !11}
!14 = distinct !{!14, !10}


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