; LLVM IR from intel/cryptography-primitives :: sources/ippcp (pcpbnu32_arith_dec)

; 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 @cpDec_BNU32(ptr noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3) #0 {
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i64, align 8
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !9
  store i32 %3, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %12 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %12, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  store i32 0, ptr %10, align 4, !tbaa !9
  br label %13

13:                                               ; preds = %38, %4
  %14 = load i32, ptr %10, align 4, !tbaa !9
  %15 = load i32, ptr %7, align 4, !tbaa !9
  %16 = icmp slt i32 %14, %15
  br i1 %16, label %17, label %41

17:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 8, ptr %11) #2
  %18 = load ptr, ptr %6, align 8, !tbaa !5
  %19 = load i32, ptr %10, align 4, !tbaa !9
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds i32, ptr %18, i64 %20
  %22 = load i32, ptr %21, align 4, !tbaa !9
  %23 = zext i32 %22 to i64
  %24 = load i32, ptr %9, align 4, !tbaa !9
  %25 = zext i32 %24 to i64
  %26 = sub i64 %23, %25
  store i64 %26, ptr %11, align 8, !tbaa !11
  %27 = load i64, ptr %11, align 8, !tbaa !11
  %28 = trunc i64 %27 to i32
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  %30 = load i32, ptr %10, align 4, !tbaa !9
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds i32, ptr %29, i64 %31
  store i32 %28, ptr %32, align 4, !tbaa !9
  %33 = load i64, ptr %11, align 8, !tbaa !11
  %34 = lshr i64 %33, 32
  %35 = and i64 %34, 4294967295
  %36 = trunc i64 %35 to i32
  %37 = lshr i32 %36, 31
  store i32 %37, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %11) #2
  br label %38

38:                                               ; preds = %17
  %39 = load i32, ptr %10, align 4, !tbaa !9
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %10, align 4, !tbaa !9
  br label %13, !llvm.loop !13

41:                                               ; preds = %13
  %42 = load i32, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  ret i32 %42
}

; 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 = !{!12, !12, i64 0}
!12 = !{!"long long", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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: nofree norecurse nosync nounwind memory(argmem: readwrite) uwtable
define dso_local i32 @cpDec_BNU32(ptr nocapture noundef writeonly %0, ptr nocapture noundef readonly %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = icmp sgt i32 %2, 0
  br i1 %5, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %4
  %wide.trip.count = zext nneg i32 %2 to i64
  %xtraiter = and i64 %wide.trip.count, 3
  %6 = icmp ult i32 %2, 4
  br i1 %6, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %wide.trip.count, 2147483644
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader.new ], [ %indvars.iv.next.3, %.lr.ph ]
  %.013 = phi i32 [ %3, %.lr.ph.preheader.new ], [ %32, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.3, %.lr.ph ]
  %7 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %9 = zext i32 %8 to i64
  %10 = zext i32 %.013 to i64
  %11 = sub nsw i64 %9, %10
  %12 = trunc i64 %11 to i32
  %13 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  store i32 %12, ptr %13, align 4, !tbaa !5
  %sum.shift.neg = ashr i64 %11, 63
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %14 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = zext i32 %15 to i64
  %17 = add nsw i64 %sum.shift.neg, %16
  %18 = trunc i64 %17 to i32
  %19 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next
  store i32 %18, ptr %19, align 4, !tbaa !5
  %sum.shift.1.neg = ashr i64 %17, 63
  %indvars.iv.next.1 = or disjoint i64 %indvars.iv, 2
  %20 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next.1
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = zext i32 %21 to i64
  %23 = add nsw i64 %sum.shift.1.neg, %22
  %24 = trunc i64 %23 to i32
  %25 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next.1
  store i32 %24, ptr %25, align 4, !tbaa !5
  %sum.shift.2.neg = ashr i64 %23, 63
  %indvars.iv.next.2 = or disjoint i64 %indvars.iv, 3
  %26 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next.2
  %27 = load i32, ptr %26, align 4, !tbaa !5
  %28 = zext i32 %27 to i64
  %29 = add nsw i64 %sum.shift.2.neg, %28
  %30 = trunc i64 %29 to i32
  %31 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next.2
  store i32 %30, ptr %31, align 4, !tbaa !5
  %sum.shift.3 = lshr i64 %29, 63
  %32 = trunc nuw nsw i64 %sum.shift.3 to i32
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %niter.next.3 = add i64 %niter, 4
  %niter.ncmp.3 = icmp eq i64 %niter.next.3, %unroll_iter
  br i1 %niter.ncmp.3, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !9

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.lcssa.ph = phi i32 [ poison, %.lr.ph.preheader ], [ %32, %.lr.ph ]
  %indvars.iv.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next.3, %.lr.ph ]
  %.013.unr = phi i32 [ %3, %.lr.ph.preheader ], [ %32, %.lr.ph ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil
  %indvars.iv.epil = phi i64 [ %indvars.iv.next.epil, %.lr.ph.epil ], [ %indvars.iv.unr, %._crit_edge.loopexit.unr-lcssa ]
  %.013.epil = phi i32 [ %40, %.lr.ph.epil ], [ %.013.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %33 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.epil
  %34 = load i32, ptr %33, align 4, !tbaa !5
  %35 = zext i32 %34 to i64
  %36 = zext i32 %.013.epil to i64
  %37 = sub nsw i64 %35, %36
  %38 = trunc i64 %37 to i32
  %39 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.epil
  store i32 %38, ptr %39, align 4, !tbaa !5
  %sum.shift.epil = lshr i64 %37, 63
  %40 = trunc nuw nsw i64 %sum.shift.epil to i32
  %indvars.iv.next.epil = add nuw nsw i64 %indvars.iv.epil, 1
  %epil.iter.next = add i64 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i64 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %._crit_edge, label %.lr.ph.epil, !llvm.loop !11

._crit_edge:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil, %4
  %.0.lcssa = phi i32 [ %3, %4 ], [ %.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %40, %.lr.ph.epil ]
  ret i32 %.0.lcssa
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: readwrite) 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/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.unroll.disable"}


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