; LLVM IR from evanxg852000/rockstartdev :: modern-cpp/chap1/core.ll (Z8is_primei)

; 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: 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 zeroext i1 @_Z8is_primei(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i8, align 1
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr %3) #2
  store i8 1, ptr %3, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 2, ptr %4, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %19, %1
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = sdiv i32 %8, 2
  %10 = icmp sle i32 %7, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %6
  store i32 2, ptr %5, align 4
  br label %22

12:                                               ; preds = %6
  %13 = load i32, ptr %2, align 4, !tbaa !5
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = srem i32 %13, %14
  %16 = icmp eq i32 %15, 0
  br i1 %16, label %17, label %18

17:                                               ; preds = %12
  store i8 0, ptr %3, align 1, !tbaa !9
  store i32 2, ptr %5, align 4
  br label %22

18:                                               ; preds = %12
  br label %19

19:                                               ; preds = %18
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = add nsw i32 %20, 1
  store i32 %21, ptr %4, align 4, !tbaa !5
  br label %6, !llvm.loop !11

22:                                               ; preds = %17, %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %23

23:                                               ; preds = %22
  %24 = load i8, ptr %3, align 1, !tbaa !9, !range !13, !noundef !14
  %25 = trunc i8 %24 to i1
  store i32 1, ptr %5, align 4
  call void @llvm.lifetime.end.p0(i64 1, ptr %3) #2
  ret i1 %25
}

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 = { 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 = !{!10, !10, i64 0}
!10 = !{!"bool", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{i8 0, i8 2}
!14 = !{}


; 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 zeroext i1 @_Z8is_primei(i32 noundef %0) local_unnamed_addr #0 {
  %2 = sdiv i32 %0, 2
  %.not7 = icmp slt i32 %0, 4
  br i1 %.not7, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1
  %smax = tail call i32 @llvm.smax.i32(i32 %2, i32 2)
  %3 = and i32 %0, 1
  %4 = icmp eq i32 %3, 0
  br i1 %4, label %._crit_edge, label %.lr.ph13

.lr.ph13:                                         ; preds = %.lr.ph.preheader, %.lr.ph
  %.0812 = phi i32 [ %5, %.lr.ph ], [ 2, %.lr.ph.preheader ]
  %exitcond = icmp eq i32 %.0812, %smax
  br i1 %exitcond, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !5

.lr.ph:                                           ; preds = %.lr.ph13
  %5 = add nuw nsw i32 %.0812, 1
  %6 = urem i32 %0, %5
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %._crit_edge.loopexit, label %.lr.ph13, !llvm.loop !5

._crit_edge.loopexit:                             ; preds = %.lr.ph13, %.lr.ph
  %.not.le = icmp sge i32 %.0812, %2
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %.lr.ph.preheader, %1
  %.not.lcssa = phi i1 [ true, %1 ], [ false, %.lr.ph.preheader ], [ %.not.le, %._crit_edge.loopexit ]
  ret i1 %.not.lcssa
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.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,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass