; LLVM IR from ubaldot/defrecs :: stm32f4x/ADC_Readings/Drivers/CMSIS/DSP/Source/StatisticsFunctions (q31)

; 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 void @arm_absmax_no_idx_q31(ptr noundef %0, i32 noundef %1, ptr noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store ptr %2, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = load i32, ptr %10, align 4, !tbaa !9
  %12 = icmp sgt i32 %11, 0
  br i1 %12, label %13, label %16

13:                                               ; preds = %3
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = load i32, ptr %14, align 4, !tbaa !9
  br label %27

16:                                               ; preds = %3
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = load i32, ptr %17, align 4, !tbaa !9
  %19 = icmp eq i32 %18, -2147483648
  br i1 %19, label %20, label %21

20:                                               ; preds = %16
  br label %25

21:                                               ; preds = %16
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  %23 = load i32, ptr %22, align 4, !tbaa !9
  %24 = sub nsw i32 0, %23
  br label %25

25:                                               ; preds = %21, %20
  %26 = phi i32 [ 2147483647, %20 ], [ %24, %21 ]
  br label %27

27:                                               ; preds = %25, %13
  %28 = phi i32 [ %15, %13 ], [ %26, %25 ]
  store i32 %28, ptr %8, align 4, !tbaa !9
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = getelementptr inbounds i32, ptr %29, i32 1
  store ptr %30, ptr %4, align 8, !tbaa !5
  %31 = load i32, ptr %5, align 4, !tbaa !9
  %32 = sub i32 %31, 1
  store i32 %32, ptr %9, align 4, !tbaa !9
  br label %33

33:                                               ; preds = %63, %27
  %34 = load i32, ptr %9, align 4, !tbaa !9
  %35 = icmp ugt i32 %34, 0
  br i1 %35, label %36, label %66

36:                                               ; preds = %33
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = load i32, ptr %37, align 4, !tbaa !9
  %39 = icmp sgt i32 %38, 0
  br i1 %39, label %40, label %43

40:                                               ; preds = %36
  %41 = load ptr, ptr %4, align 8, !tbaa !5
  %42 = load i32, ptr %41, align 4, !tbaa !9
  br label %54

43:                                               ; preds = %36
  %44 = load ptr, ptr %4, align 8, !tbaa !5
  %45 = load i32, ptr %44, align 4, !tbaa !9
  %46 = icmp eq i32 %45, -2147483648
  br i1 %46, label %47, label %48

47:                                               ; preds = %43
  br label %52

48:                                               ; preds = %43
  %49 = load ptr, ptr %4, align 8, !tbaa !5
  %50 = load i32, ptr %49, align 4, !tbaa !9
  %51 = sub nsw i32 0, %50
  br label %52

52:                                               ; preds = %48, %47
  %53 = phi i32 [ 2147483647, %47 ], [ %51, %48 ]
  br label %54

54:                                               ; preds = %52, %40
  %55 = phi i32 [ %42, %40 ], [ %53, %52 ]
  store i32 %55, ptr %7, align 4, !tbaa !9
  %56 = load ptr, ptr %4, align 8, !tbaa !5
  %57 = getelementptr inbounds i32, ptr %56, i32 1
  store ptr %57, ptr %4, align 8, !tbaa !5
  %58 = load i32, ptr %8, align 4, !tbaa !9
  %59 = load i32, ptr %7, align 4, !tbaa !9
  %60 = icmp slt i32 %58, %59
  br i1 %60, label %61, label %63

61:                                               ; preds = %54
  %62 = load i32, ptr %7, align 4, !tbaa !9
  store i32 %62, ptr %8, align 4, !tbaa !9
  br label %63

63:                                               ; preds = %61, %54
  %64 = load i32, ptr %9, align 4, !tbaa !9
  %65 = add i32 %64, -1
  store i32 %65, ptr %9, align 4, !tbaa !9
  br label %33, !llvm.loop !11

66:                                               ; preds = %33
  %67 = load i32, ptr %8, align 4, !tbaa !9
  %68 = load ptr, ptr %6, align 8, !tbaa !5
  store i32 %67, ptr %68, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret void
}

; 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"}


; 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(read, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local void @arm_absmax_no_idx_q31(ptr nocapture noundef readonly %0, i32 noundef %1, ptr nocapture noundef writeonly %2) local_unnamed_addr #0 {
  %4 = load i32, ptr %0, align 4, !tbaa !5
  %5 = icmp sgt i32 %4, 0
  %6 = icmp eq i32 %4, -2147483648
  %7 = sub nsw i32 0, %4
  %spec.select = select i1 %6, i32 2147483647, i32 %7
  %8 = select i1 %5, i32 %4, i32 %spec.select
  %.026 = add i32 %1, -1
  %.not27 = icmp eq i32 %.026, 0
  br i1 %.not27, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %9 = zext i32 %.026 to i64
  %min.iters.check = icmp ult i32 %.026, 8
  br i1 %min.iters.check, label %.lr.ph.preheader36, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %9, 4294967288
  %.cast = trunc nuw i64 %n.vec to i32
  %ind.end = sub i32 %.026, %.cast
  %10 = shl nuw nsw i64 %n.vec, 2
  %ind.end31 = getelementptr i8, ptr %0, i64 %10
  %minmax.ident.splatinsert = insertelement <4 x i32> poison, i32 %8, i64 0
  %minmax.ident.splat = shufflevector <4 x i32> %minmax.ident.splatinsert, <4 x i32> poison, <4 x i32> zeroinitializer
  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> [ %minmax.ident.splat, %vector.ph ], [ %23, %vector.body ]
  %vec.phi33 = phi <4 x i32> [ %minmax.ident.splat, %vector.ph ], [ %24, %vector.body ]
  %offset.idx = shl i64 %index, 2
  %next.gep = getelementptr i8, ptr %0, i64 %offset.idx
  %11 = getelementptr inbounds i8, ptr %next.gep, i64 4
  %12 = getelementptr inbounds i8, ptr %next.gep, i64 20
  %wide.load = load <4 x i32>, ptr %11, align 4, !tbaa !5
  %wide.load35 = load <4 x i32>, ptr %12, align 4, !tbaa !5
  %13 = icmp sgt <4 x i32> %wide.load, zeroinitializer
  %14 = icmp sgt <4 x i32> %wide.load35, zeroinitializer
  %15 = icmp eq <4 x i32> %wide.load, <i32 -2147483648, i32 -2147483648, i32 -2147483648, i32 -2147483648>
  %16 = icmp eq <4 x i32> %wide.load35, <i32 -2147483648, i32 -2147483648, i32 -2147483648, i32 -2147483648>
  %17 = sub nsw <4 x i32> zeroinitializer, %wide.load
  %18 = sub nsw <4 x i32> zeroinitializer, %wide.load35
  %19 = select <4 x i1> %15, <4 x i32> <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>, <4 x i32> %17
  %20 = select <4 x i1> %16, <4 x i32> <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>, <4 x i32> %18
  %21 = select <4 x i1> %13, <4 x i32> %wide.load, <4 x i32> %19
  %22 = select <4 x i1> %14, <4 x i32> %wide.load35, <4 x i32> %20
  %23 = tail call <4 x i32> @llvm.smax.v4i32(<4 x i32> %vec.phi, <4 x i32> %21)
  %24 = tail call <4 x i32> @llvm.smax.v4i32(<4 x i32> %vec.phi33, <4 x i32> %22)
  %index.next = add nuw i64 %index, 8
  %25 = icmp eq i64 %index.next, %n.vec
  br i1 %25, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %rdx.minmax = tail call <4 x i32> @llvm.smax.v4i32(<4 x i32> %23, <4 x i32> %24)
  %26 = tail call i32 @llvm.vector.reduce.smax.v4i32(<4 x i32> %rdx.minmax)
  %cmp.n = icmp eq i64 %n.vec, %9
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader36

.lr.ph.preheader36:                               ; preds = %middle.block, %.lr.ph.preheader
  %.030.ph = phi i32 [ %.026, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.01729.ph = phi i32 [ %8, %.lr.ph.preheader ], [ %26, %middle.block ]
  %.pn28.ph = phi ptr [ %0, %.lr.ph.preheader ], [ %ind.end31, %middle.block ]
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader36, %.lr.ph
  %.030 = phi i32 [ %.0, %.lr.ph ], [ %.030.ph, %.lr.ph.preheader36 ]
  %.01729 = phi i32 [ %spec.select25, %.lr.ph ], [ %.01729.ph, %.lr.ph.preheader36 ]
  %.pn28 = phi ptr [ %.018, %.lr.ph ], [ %.pn28.ph, %.lr.ph.preheader36 ]
  %.018 = getelementptr inbounds i8, ptr %.pn28, i64 4
  %27 = load i32, ptr %.018, align 4, !tbaa !5
  %28 = icmp sgt i32 %27, 0
  %29 = icmp eq i32 %27, -2147483648
  %30 = sub nsw i32 0, %27
  %spec.select24 = select i1 %29, i32 2147483647, i32 %30
  %31 = select i1 %28, i32 %27, i32 %spec.select24
  %spec.select25 = tail call i32 @llvm.smax.i32(i32 %.01729, i32 %31)
  %.0 = add i32 %.030, -1
  %.not = icmp eq i32 %.0, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph, %middle.block, %3
  %.017.lcssa = phi i32 [ %8, %3 ], [ %26, %middle.block ], [ %spec.select25, %.lr.ph ]
  store i32 %.017.lcssa, ptr %2, align 4, !tbaa !5
  ret void
}

; 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 <4 x i32> @llvm.smax.v4i32(<4 x i32>, <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(read, argmem: readwrite, inaccessiblemem: 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 = !{!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}


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