; 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_mse_q31(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 i64, align 8
  %11 = alloca i32, align 4
  %12 = alloca i32, 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 8, ptr %10) #3
  store i64 0, ptr %10, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #3
  %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 %39

17:                                               ; preds = %14
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = getelementptr inbounds i32, ptr %18, i32 1
  store ptr %19, ptr %5, align 8, !tbaa !5
  %20 = load i32, ptr %18, align 4, !tbaa !9
  %21 = ashr i32 %20, 1
  store i32 %21, ptr %11, align 4, !tbaa !9
  %22 = load ptr, ptr %6, align 8, !tbaa !5
  %23 = getelementptr inbounds i32, ptr %22, i32 1
  store ptr %23, ptr %6, align 8, !tbaa !5
  %24 = load i32, ptr %22, align 4, !tbaa !9
  %25 = ashr i32 %24, 1
  store i32 %25, ptr %12, align 4, !tbaa !9
  %26 = load i32, ptr %11, align 4, !tbaa !9
  %27 = load i32, ptr %12, align 4, !tbaa !9
  %28 = call i32 @__QSUB(i32 noundef %26, i32 noundef %27)
  store i32 %28, ptr %11, align 4, !tbaa !9
  %29 = load i32, ptr %11, align 4, !tbaa !9
  %30 = sext i32 %29 to i64
  %31 = load i32, ptr %11, align 4, !tbaa !9
  %32 = sext i32 %31 to i64
  %33 = mul nsw i64 %30, %32
  %34 = ashr i64 %33, 14
  %35 = load i64, ptr %10, align 8, !tbaa !11
  %36 = add nsw i64 %35, %34
  store i64 %36, ptr %10, align 8, !tbaa !11
  %37 = load i32, ptr %9, align 4, !tbaa !9
  %38 = add i32 %37, -1
  store i32 %38, ptr %9, align 4, !tbaa !9
  br label %14, !llvm.loop !13

39:                                               ; preds = %14
  %40 = load i64, ptr %10, align 8, !tbaa !11
  %41 = load i32, ptr %7, align 4, !tbaa !9
  %42 = zext i32 %41 to i64
  %43 = sdiv i64 %40, %42
  %44 = ashr i64 %43, 15
  %45 = trunc i64 %44 to i32
  %46 = load ptr, ptr %8, align 8, !tbaa !5
  store i32 %45, ptr %46, align 4, !tbaa !9
  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 8, 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: alwaysinline nounwind uwtable
declare hidden i32 @__QSUB(i32 noundef, i32 noundef) #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 = { alwaysinline 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 #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 = !{!"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: nounwind uwtable
define dso_local void @arm_mse_q31(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

.lr.ph:                                           ; preds = %4, %.lr.ph
  %.019 = phi ptr [ %5, %.lr.ph ], [ %0, %4 ]
  %.01218 = phi ptr [ %8, %.lr.ph ], [ %1, %4 ]
  %.01317 = phi i64 [ %15, %.lr.ph ], [ 0, %4 ]
  %.01416 = phi i32 [ %16, %.lr.ph ], [ %2, %4 ]
  %5 = getelementptr inbounds i8, ptr %.019, i64 4
  %6 = load i32, ptr %.019, align 4, !tbaa !5
  %7 = ashr i32 %6, 1
  %8 = getelementptr inbounds i8, ptr %.01218, i64 4
  %9 = load i32, ptr %.01218, align 4, !tbaa !5
  %10 = ashr i32 %9, 1
  %11 = tail call i32 @__QSUB(i32 noundef %7, i32 noundef %10)
  %12 = sext i32 %11 to i64
  %13 = mul nsw i64 %12, %12
  %14 = lshr i64 %13, 14
  %15 = add nuw nsw i64 %14, %.01317
  %16 = add i32 %.01416, -1
  %.not = icmp eq i32 %16, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %4
  %.013.lcssa = phi i64 [ 0, %4 ], [ %15, %.lr.ph ]
  %17 = zext i32 %2 to i64
  %18 = udiv i64 %.013.lcssa, %17
  %19 = lshr i64 %18, 15
  %20 = trunc i64 %19 to i32
  store i32 %20, ptr %3, align 4, !tbaa !5
  ret void
}

; Function Attrs: alwaysinline nounwind uwtable
declare hidden i32 @__QSUB(i32 noundef, i32 noundef) local_unnamed_addr #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 = { alwaysinline 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" }

!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"}


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