; LLVM IR from tensorflow/tflite-micro :: signal/src/max_abs.ll (ZN6tflite11tflm_signal8MaxAbs16EPKsi)

; 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 signext i16 @_ZN6tflite11tflm_signal8MaxAbs16EPKsi(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i16, align 2
  %6 = alloca i32, align 4
  %7 = alloca i16, align 2
  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 2, ptr %5) #2
  store i16 0, ptr %5, align 2, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %40, %2
  %9 = load i32, ptr %6, align 4, !tbaa !9
  %10 = load i32, ptr %4, align 4, !tbaa !9
  %11 = icmp slt i32 %9, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %43

13:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 2, ptr %7) #2
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  %15 = load i32, ptr %6, align 4, !tbaa !9
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds i16, ptr %14, i64 %16
  %18 = load i16, ptr %17, align 2, !tbaa !11
  store i16 %18, ptr %7, align 2, !tbaa !11
  %19 = load i16, ptr %7, align 2, !tbaa !11
  %20 = sext i16 %19 to i32
  %21 = load i16, ptr %5, align 2, !tbaa !11
  %22 = sext i16 %21 to i32
  %23 = icmp sgt i32 %20, %22
  br i1 %23, label %24, label %26

24:                                               ; preds = %13
  %25 = load i16, ptr %7, align 2, !tbaa !11
  store i16 %25, ptr %5, align 2, !tbaa !11
  br label %39

26:                                               ; preds = %13
  %27 = load i16, ptr %7, align 2, !tbaa !11
  %28 = sext i16 %27 to i32
  %29 = sub nsw i32 0, %28
  %30 = load i16, ptr %5, align 2, !tbaa !11
  %31 = sext i16 %30 to i32
  %32 = icmp sgt i32 %29, %31
  br i1 %32, label %33, label %38

33:                                               ; preds = %26
  %34 = load i16, ptr %7, align 2, !tbaa !11
  %35 = sext i16 %34 to i32
  %36 = sub nsw i32 0, %35
  %37 = trunc i32 %36 to i16
  store i16 %37, ptr %5, align 2, !tbaa !11
  br label %38

38:                                               ; preds = %33, %26
  br label %39

39:                                               ; preds = %38, %24
  call void @llvm.lifetime.end.p0(i64 2, ptr %7) #2
  br label %40

40:                                               ; preds = %39
  %41 = load i32, ptr %6, align 4, !tbaa !9
  %42 = add nsw i32 %41, 1
  store i32 %42, ptr %6, align 4, !tbaa !9
  br label %8, !llvm.loop !13

43:                                               ; preds = %12
  %44 = load i16, ptr %5, align 2, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 2, ptr %5) #2
  ret i16 %44
}

; 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"short", !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: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef signext i16 @_ZN6tflite11tflm_signal8MaxAbs16EPKsi(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 %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = zext nneg i32 %1 to i64
  %xtraiter = and i64 %wide.trip.count, 1
  %4 = icmp eq i32 %1, 1
  br i1 %4, 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, 2147483646
  br label %.lr.ph

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.1.lcssa.ph = phi i16 [ poison, %.lr.ph.preheader ], [ %.1.1, %.lr.ph ]
  %indvars.iv.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next.1, %.lr.ph ]
  %.016.unr = phi i16 [ 0, %.lr.ph.preheader ], [ %.1.1, %.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
  %5 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv.unr
  %6 = load i16, ptr %5, align 2, !tbaa !5
  %7 = icmp sgt i16 %6, %.016.unr
  %8 = sext i16 %.016.unr to i32
  %9 = sext i16 %6 to i32
  %10 = sub nsw i32 0, %9
  %11 = icmp sgt i32 %10, %8
  %12 = trunc i32 %10 to i16
  %spec.select.epil = select i1 %11, i16 %12, i16 %.016.unr
  %.1.epil = select i1 %7, i16 %6, i16 %spec.select.epil
  br label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph.epil, %._crit_edge.loopexit.unr-lcssa, %2
  %.0.lcssa = phi i16 [ 0, %2 ], [ %.1.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %.1.epil, %.lr.ph.epil ]
  ret i16 %.0.lcssa

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader.new ], [ %indvars.iv.next.1, %.lr.ph ]
  %.016 = phi i16 [ 0, %.lr.ph.preheader.new ], [ %.1.1, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %.lr.ph ]
  %13 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv
  %14 = load i16, ptr %13, align 2, !tbaa !5
  %15 = icmp sgt i16 %14, %.016
  %16 = sext i16 %.016 to i32
  %17 = sext i16 %14 to i32
  %18 = sub nsw i32 0, %17
  %19 = icmp sgt i32 %18, %16
  %20 = trunc i32 %18 to i16
  %spec.select = select i1 %19, i16 %20, i16 %.016
  %.1 = select i1 %15, i16 %14, i16 %spec.select
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %21 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv.next
  %22 = load i16, ptr %21, align 2, !tbaa !5
  %23 = icmp sgt i16 %22, %.1
  %24 = sext i16 %.1 to i32
  %25 = sext i16 %22 to i32
  %26 = sub nsw i32 0, %25
  %27 = icmp sgt i32 %26, %24
  %28 = trunc i32 %26 to i16
  %spec.select.1 = select i1 %27, i16 %28, i16 %.1
  %.1.1 = select i1 %23, i16 %22, i16 %spec.select.1
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
  br i1 %niter.ncmp.1, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !9
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn 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" }

!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 = !{!"short", !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,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass