; LLVM IR from ubaldot/defrecs :: stm32f4x/ADC_Readings/Drivers/CMSIS/DSP/Source/StatisticsFunctions (q7)

; 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_max_no_idx_q7(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 i8, align 1
  %8 = alloca i8, align 1
  %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 1, ptr %7) #2
  call void @llvm.lifetime.start.p0(i64 1, ptr %8) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = getelementptr inbounds i8, ptr %10, i32 1
  store ptr %11, ptr %4, align 8, !tbaa !5
  %12 = load i8, ptr %10, align 1, !tbaa !11
  store i8 %12, ptr %8, align 1, !tbaa !11
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = sub i32 %13, 1
  store i32 %14, ptr %9, align 4, !tbaa !9
  br label %15

15:                                               ; preds = %29, %3
  %16 = load i32, ptr %9, align 4, !tbaa !9
  %17 = icmp ugt i32 %16, 0
  br i1 %17, label %18, label %32

18:                                               ; preds = %15
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = getelementptr inbounds i8, ptr %19, i32 1
  store ptr %20, ptr %4, align 8, !tbaa !5
  %21 = load i8, ptr %19, align 1, !tbaa !11
  store i8 %21, ptr %7, align 1, !tbaa !11
  %22 = load i8, ptr %8, align 1, !tbaa !11
  %23 = sext i8 %22 to i32
  %24 = load i8, ptr %7, align 1, !tbaa !11
  %25 = sext i8 %24 to i32
  %26 = icmp slt i32 %23, %25
  br i1 %26, label %27, label %29

27:                                               ; preds = %18
  %28 = load i8, ptr %7, align 1, !tbaa !11
  store i8 %28, ptr %8, align 1, !tbaa !11
  br label %29

29:                                               ; preds = %27, %18
  %30 = load i32, ptr %9, align 4, !tbaa !9
  %31 = add i32 %30, -1
  store i32 %31, ptr %9, align 4, !tbaa !9
  br label %15, !llvm.loop !12

32:                                               ; preds = %15
  %33 = load i8, ptr %8, align 1, !tbaa !11
  %34 = load ptr, ptr %6, align 8, !tbaa !5
  store i8 %33, ptr %34, align 1, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 1, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 1, 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 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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_max_no_idx_q7(ptr nocapture noundef readonly %0, i32 noundef %1, ptr nocapture noundef writeonly %2) local_unnamed_addr #0 {
  %4 = load i8, ptr %0, align 1, !tbaa !5
  %.011 = add i32 %1, -1
  %.not12 = icmp eq i32 %.011, 0
  br i1 %.not12, label %._crit_edge, label %iter.check

iter.check:                                       ; preds = %3
  %5 = zext i32 %.011 to i64
  %min.iters.check = icmp ult i32 %.011, 8
  br i1 %min.iters.check, label %.lr.ph.preheader, label %vector.main.loop.iter.check

vector.main.loop.iter.check:                      ; preds = %iter.check
  %min.iters.check16 = icmp ult i32 %.011, 32
  br i1 %min.iters.check16, label %vec.epilog.ph, label %vector.ph

vector.ph:                                        ; preds = %vector.main.loop.iter.check
  %n.vec = and i64 %5, 4294967264
  %minmax.ident.splatinsert = insertelement <16 x i8> poison, i8 %4, i64 0
  %minmax.ident.splat = shufflevector <16 x i8> %minmax.ident.splatinsert, <16 x i8> poison, <16 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 <16 x i8> [ %minmax.ident.splat, %vector.ph ], [ %8, %vector.body ]
  %vec.phi17 = phi <16 x i8> [ %minmax.ident.splat, %vector.ph ], [ %9, %vector.body ]
  %next.gep = getelementptr i8, ptr %0, i64 %index
  %6 = getelementptr inbounds i8, ptr %next.gep, i64 1
  %7 = getelementptr inbounds i8, ptr %next.gep, i64 17
  %wide.load = load <16 x i8>, ptr %6, align 1, !tbaa !5
  %wide.load19 = load <16 x i8>, ptr %7, align 1, !tbaa !5
  %8 = tail call <16 x i8> @llvm.smax.v16i8(<16 x i8> %vec.phi, <16 x i8> %wide.load)
  %9 = tail call <16 x i8> @llvm.smax.v16i8(<16 x i8> %vec.phi17, <16 x i8> %wide.load19)
  %index.next = add nuw i64 %index, 32
  %10 = icmp eq i64 %index.next, %n.vec
  br i1 %10, label %middle.block, label %vector.body, !llvm.loop !8

middle.block:                                     ; preds = %vector.body
  %rdx.minmax = tail call <16 x i8> @llvm.smax.v16i8(<16 x i8> %8, <16 x i8> %9)
  %11 = tail call i8 @llvm.vector.reduce.smax.v16i8(<16 x i8> %rdx.minmax)
  %cmp.n = icmp eq i64 %n.vec, %5
  br i1 %cmp.n, label %._crit_edge, label %vec.epilog.iter.check

vec.epilog.iter.check:                            ; preds = %middle.block
  %ind.end25 = getelementptr i8, ptr %0, i64 %n.vec
  %.cast22 = trunc nuw i64 %n.vec to i32
  %ind.end23 = sub i32 %.011, %.cast22
  %n.vec.remaining = and i64 %5, 24
  %min.epilog.iters.check = icmp eq i64 %n.vec.remaining, 0
  br i1 %min.epilog.iters.check, label %.lr.ph.preheader, label %vec.epilog.ph

vec.epilog.ph:                                    ; preds = %vector.main.loop.iter.check, %vec.epilog.iter.check
  %bc.merge.rdx = phi i8 [ %11, %vec.epilog.iter.check ], [ %4, %vector.main.loop.iter.check ]
  %vec.epilog.resume.val = phi i64 [ %n.vec, %vec.epilog.iter.check ], [ 0, %vector.main.loop.iter.check ]
  %n.vec21 = and i64 %5, 4294967288
  %.cast = trunc nuw i64 %n.vec21 to i32
  %ind.end = sub i32 %.011, %.cast
  %ind.end24 = getelementptr i8, ptr %0, i64 %n.vec21
  %minmax.ident.splatinsert29 = insertelement <8 x i8> poison, i8 %bc.merge.rdx, i64 0
  %minmax.ident.splat30 = shufflevector <8 x i8> %minmax.ident.splatinsert29, <8 x i8> poison, <8 x i32> zeroinitializer
  %invariant.gep = getelementptr i8, ptr %0, i64 1
  br label %vec.epilog.vector.body

vec.epilog.vector.body:                           ; preds = %vec.epilog.vector.body, %vec.epilog.ph
  %index27 = phi i64 [ %vec.epilog.resume.val, %vec.epilog.ph ], [ %index.next33, %vec.epilog.vector.body ]
  %vec.phi28 = phi <8 x i8> [ %minmax.ident.splat30, %vec.epilog.ph ], [ %12, %vec.epilog.vector.body ]
  %gep = getelementptr i8, ptr %invariant.gep, i64 %index27
  %wide.load32 = load <8 x i8>, ptr %gep, align 1, !tbaa !5
  %12 = tail call <8 x i8> @llvm.smax.v8i8(<8 x i8> %vec.phi28, <8 x i8> %wide.load32)
  %index.next33 = add nuw i64 %index27, 8
  %13 = icmp eq i64 %index.next33, %n.vec21
  br i1 %13, label %vec.epilog.middle.block, label %vec.epilog.vector.body, !llvm.loop !12

vec.epilog.middle.block:                          ; preds = %vec.epilog.vector.body
  %14 = tail call i8 @llvm.vector.reduce.smax.v8i8(<8 x i8> %12)
  %cmp.n34 = icmp eq i64 %n.vec21, %5
  br i1 %cmp.n34, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %vec.epilog.middle.block, %iter.check, %vec.epilog.iter.check
  %.015.ph = phi i32 [ %.011, %iter.check ], [ %ind.end23, %vec.epilog.iter.check ], [ %ind.end, %vec.epilog.middle.block ]
  %.0914.ph = phi i8 [ %4, %iter.check ], [ %11, %vec.epilog.iter.check ], [ %14, %vec.epilog.middle.block ]
  %.pn13.ph = phi ptr [ %0, %iter.check ], [ %ind.end25, %vec.epilog.iter.check ], [ %ind.end24, %vec.epilog.middle.block ]
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %.015 = phi i32 [ %.0, %.lr.ph ], [ %.015.ph, %.lr.ph.preheader ]
  %.0914 = phi i8 [ %spec.select, %.lr.ph ], [ %.0914.ph, %.lr.ph.preheader ]
  %.pn13 = phi ptr [ %.010, %.lr.ph ], [ %.pn13.ph, %.lr.ph.preheader ]
  %.010 = getelementptr inbounds i8, ptr %.pn13, i64 1
  %15 = load i8, ptr %.010, align 1, !tbaa !5
  %spec.select = tail call i8 @llvm.smax.i8(i8 %.0914, i8 %15)
  %.0 = add i32 %.015, -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, %vec.epilog.middle.block, %3
  %.09.lcssa = phi i8 [ %4, %3 ], [ %11, %middle.block ], [ %14, %vec.epilog.middle.block ], [ %spec.select, %.lr.ph ]
  store i8 %.09.lcssa, ptr %2, align 1, !tbaa !5
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i8 @llvm.smax.i8(i8, i8) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare <16 x i8> @llvm.smax.v16i8(<16 x i8>, <16 x i8>) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i8 @llvm.vector.reduce.smax.v16i8(<16 x i8>) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare <8 x i8> @llvm.smax.v8i8(<8 x i8>, <8 x i8>) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i8 @llvm.vector.reduce.smax.v8i8(<8 x i8>) #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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9, !10, !11}
!9 = !{!"llvm.loop.mustprogress"}
!10 = !{!"llvm.loop.isvectorized", i32 1}
!11 = !{!"llvm.loop.unroll.runtime.disable"}
!12 = distinct !{!12, !9, !10, !11}
!13 = distinct !{!13, !9, !11, !10}


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