; LLVM IR from ubaldot/defrecs :: stm32f4x/ADC_Readings/Drivers/CMSIS/DSP/Source/StatisticsFunctions (f32)

; 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_mse_f32(ptr noundef %0, ptr noundef %1, i32 noundef %2, ptr noundef %3) #0 {
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca float, align 4
  %11 = alloca float, align 4
  %12 = alloca float, align 4
  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 ptr %3, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #3
  store float 0.000000e+00, ptr %12, align 4, !tbaa !11
  %13 = load i32, ptr %7, align 4, !tbaa !9
  store i32 %13, ptr %9, align 4, !tbaa !9
  br label %14

14:                                               ; preds = %17, %4
  %15 = load i32, ptr %9, align 4, !tbaa !9
  %16 = icmp ugt i32 %15, 0
  br i1 %16, label %17, label %33

17:                                               ; preds = %14
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = getelementptr inbounds float, ptr %18, i32 1
  store ptr %19, ptr %5, align 8, !tbaa !5
  %20 = load float, ptr %18, align 4, !tbaa !11
  store float %20, ptr %10, align 4, !tbaa !11
  %21 = load ptr, ptr %6, align 8, !tbaa !5
  %22 = getelementptr inbounds float, ptr %21, i32 1
  store ptr %22, ptr %6, align 8, !tbaa !5
  %23 = load float, ptr %21, align 4, !tbaa !11
  store float %23, ptr %11, align 4, !tbaa !11
  %24 = load float, ptr %10, align 4, !tbaa !11
  %25 = load float, ptr %11, align 4, !tbaa !11
  %26 = fsub float %24, %25
  store float %26, ptr %10, align 4, !tbaa !11
  %27 = load float, ptr %10, align 4, !tbaa !11
  %28 = load float, ptr %10, align 4, !tbaa !11
  %29 = load float, ptr %12, align 4, !tbaa !11
  %30 = call float @llvm.fmuladd.f32(float %27, float %28, float %29)
  store float %30, ptr %12, align 4, !tbaa !11
  %31 = load i32, ptr %9, align 4, !tbaa !9
  %32 = add i32 %31, -1
  store i32 %32, ptr %9, align 4, !tbaa !9
  br label %14, !llvm.loop !13

33:                                               ; preds = %14
  %34 = load float, ptr %12, align 4, !tbaa !11
  %35 = load i32, ptr %7, align 4, !tbaa !9
  %36 = uitofp i32 %35 to float
  %37 = fdiv float %34, %36
  %38 = load ptr, ptr %8, align 8, !tbaa !5
  store float %37, ptr %38, align 4, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  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 speculatable willreturn memory(none)
declare float @llvm.fmuladd.f32(float, float, float) #2

; 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 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #3 = { 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 = !{!"float", !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(read, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local void @arm_mse_f32(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i32 noundef %2, ptr nocapture noundef writeonly %3) local_unnamed_addr #0 {
  %.not15 = icmp eq i32 %2, 0
  br i1 %.not15, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %4
  %xtraiter = and i32 %2, 3
  %lcmp.mod.not = icmp eq i32 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol

.lr.ph.prol:                                      ; preds = %.lr.ph.preheader, %.lr.ph.prol
  %.019.prol = phi float [ %10, %.lr.ph.prol ], [ 0.000000e+00, %.lr.ph.preheader ]
  %.01218.prol = phi ptr [ %5, %.lr.ph.prol ], [ %0, %.lr.ph.preheader ]
  %.01317.prol = phi ptr [ %7, %.lr.ph.prol ], [ %1, %.lr.ph.preheader ]
  %.01416.prol = phi i32 [ %11, %.lr.ph.prol ], [ %2, %.lr.ph.preheader ]
  %prol.iter = phi i32 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader ]
  %5 = getelementptr inbounds i8, ptr %.01218.prol, i64 4
  %6 = load float, ptr %.01218.prol, align 4, !tbaa !5
  %7 = getelementptr inbounds i8, ptr %.01317.prol, i64 4
  %8 = load float, ptr %.01317.prol, align 4, !tbaa !5
  %9 = fsub float %6, %8
  %10 = tail call float @llvm.fmuladd.f32(float %9, float %9, float %.019.prol)
  %11 = add i32 %.01416.prol, -1
  %prol.iter.next = add i32 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i32 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol, !llvm.loop !9

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader
  %.lcssa.unr = phi float [ poison, %.lr.ph.preheader ], [ %10, %.lr.ph.prol ]
  %.019.unr = phi float [ 0.000000e+00, %.lr.ph.preheader ], [ %10, %.lr.ph.prol ]
  %.01218.unr = phi ptr [ %0, %.lr.ph.preheader ], [ %5, %.lr.ph.prol ]
  %.01317.unr = phi ptr [ %1, %.lr.ph.preheader ], [ %7, %.lr.ph.prol ]
  %.01416.unr = phi i32 [ %2, %.lr.ph.preheader ], [ %11, %.lr.ph.prol ]
  %12 = icmp ult i32 %2, 4
  br i1 %12, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.019 = phi float [ %36, %.lr.ph ], [ %.019.unr, %.lr.ph.prol.loopexit ]
  %.01218 = phi ptr [ %31, %.lr.ph ], [ %.01218.unr, %.lr.ph.prol.loopexit ]
  %.01317 = phi ptr [ %33, %.lr.ph ], [ %.01317.unr, %.lr.ph.prol.loopexit ]
  %.01416 = phi i32 [ %37, %.lr.ph ], [ %.01416.unr, %.lr.ph.prol.loopexit ]
  %13 = getelementptr inbounds i8, ptr %.01218, i64 4
  %14 = load float, ptr %.01218, align 4, !tbaa !5
  %15 = getelementptr inbounds i8, ptr %.01317, i64 4
  %16 = load float, ptr %.01317, align 4, !tbaa !5
  %17 = fsub float %14, %16
  %18 = tail call float @llvm.fmuladd.f32(float %17, float %17, float %.019)
  %19 = getelementptr inbounds i8, ptr %.01218, i64 8
  %20 = load float, ptr %13, align 4, !tbaa !5
  %21 = getelementptr inbounds i8, ptr %.01317, i64 8
  %22 = load float, ptr %15, align 4, !tbaa !5
  %23 = fsub float %20, %22
  %24 = tail call float @llvm.fmuladd.f32(float %23, float %23, float %18)
  %25 = getelementptr inbounds i8, ptr %.01218, i64 12
  %26 = load float, ptr %19, align 4, !tbaa !5
  %27 = getelementptr inbounds i8, ptr %.01317, i64 12
  %28 = load float, ptr %21, align 4, !tbaa !5
  %29 = fsub float %26, %28
  %30 = tail call float @llvm.fmuladd.f32(float %29, float %29, float %24)
  %31 = getelementptr inbounds i8, ptr %.01218, i64 16
  %32 = load float, ptr %25, align 4, !tbaa !5
  %33 = getelementptr inbounds i8, ptr %.01317, i64 16
  %34 = load float, ptr %27, align 4, !tbaa !5
  %35 = fsub float %32, %34
  %36 = tail call float @llvm.fmuladd.f32(float %35, float %35, float %30)
  %37 = add i32 %.01416, -4
  %.not.3 = icmp eq i32 %37, 0
  br i1 %.not.3, label %._crit_edge, label %.lr.ph, !llvm.loop !11

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %4
  %.0.lcssa = phi float [ 0.000000e+00, %4 ], [ %.lcssa.unr, %.lr.ph.prol.loopexit ], [ %36, %.lr.ph ]
  %38 = uitofp i32 %2 to float
  %39 = fdiv float %.0.lcssa, %38
  store float %39, ptr %3, align 4, !tbaa !5
  ret void
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare float @llvm.fmuladd.f32(float, float, float) #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 = { mustprogress 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 = !{!"float", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.unroll.disable"}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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