; LLVM IR from ubaldot/defrecs :: stm32f4x/ADC_Readings/Drivers/CMSIS/DSP/Source/StatisticsFunctions (q15)

; 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_q15(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 i16, align 2
  %12 = alloca i16, align 2
  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 2, ptr %11) #3
  call void @llvm.lifetime.start.p0(i64 2, 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 %47

17:                                               ; preds = %14
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = getelementptr inbounds i16, ptr %18, i32 1
  store ptr %19, ptr %5, align 8, !tbaa !5
  %20 = load i16, ptr %18, align 2, !tbaa !13
  %21 = sext i16 %20 to i32
  %22 = ashr i32 %21, 1
  %23 = trunc i32 %22 to i16
  store i16 %23, ptr %11, align 2, !tbaa !13
  %24 = load ptr, ptr %6, align 8, !tbaa !5
  %25 = getelementptr inbounds i16, ptr %24, i32 1
  store ptr %25, ptr %6, align 8, !tbaa !5
  %26 = load i16, ptr %24, align 2, !tbaa !13
  %27 = sext i16 %26 to i32
  %28 = ashr i32 %27, 1
  %29 = trunc i32 %28 to i16
  store i16 %29, ptr %12, align 2, !tbaa !13
  %30 = load i16, ptr %11, align 2, !tbaa !13
  %31 = sext i16 %30 to i32
  %32 = load i16, ptr %12, align 2, !tbaa !13
  %33 = sext i16 %32 to i32
  %34 = sub nsw i32 %31, %33
  %35 = call i32 @__SSAT(i32 noundef %34, i32 noundef 16)
  %36 = trunc i32 %35 to i16
  store i16 %36, ptr %11, align 2, !tbaa !13
  %37 = load i16, ptr %11, align 2, !tbaa !13
  %38 = sext i16 %37 to i32
  %39 = load i16, ptr %11, align 2, !tbaa !13
  %40 = sext i16 %39 to i32
  %41 = mul nsw i32 %38, %40
  %42 = sext i32 %41 to i64
  %43 = load i64, ptr %10, align 8, !tbaa !11
  %44 = add nsw i64 %43, %42
  store i64 %44, ptr %10, align 8, !tbaa !11
  %45 = load i32, ptr %9, align 4, !tbaa !9
  %46 = add i32 %45, -1
  store i32 %46, ptr %9, align 4, !tbaa !9
  br label %14, !llvm.loop !15

47:                                               ; preds = %14
  %48 = load i64, ptr %10, align 8, !tbaa !11
  %49 = load i32, ptr %7, align 4, !tbaa !9
  %50 = zext i32 %49 to i64
  %51 = sdiv i64 %48, %50
  %52 = trunc i64 %51 to i32
  %53 = ashr i32 %52, 13
  %54 = call i32 @__SSAT(i32 noundef %53, i32 noundef 16)
  %55 = trunc i32 %54 to i16
  %56 = load ptr, ptr %8, align 8, !tbaa !5
  store i16 %55, ptr %56, align 2, !tbaa !13
  call void @llvm.lifetime.end.p0(i64 2, ptr %12) #3
  call void @llvm.lifetime.end.p0(i64 2, 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 @__SSAT(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 = !{!14, !14, i64 0}
!14 = !{!"short", !7, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"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_q15(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 [ %16, %.lr.ph ], [ 0, %4 ]
  %.01416 = phi i32 [ %17, %.lr.ph ], [ %2, %4 ]
  %5 = getelementptr inbounds i8, ptr %.019, i64 2
  %6 = load i16, ptr %.019, align 2, !tbaa !5
  %7 = ashr i16 %6, 1
  %8 = getelementptr inbounds i8, ptr %.01218, i64 2
  %9 = load i16, ptr %.01218, align 2, !tbaa !5
  %10 = ashr i16 %9, 1
  %narrow = sub nsw i16 %7, %10
  %11 = sext i16 %narrow to i32
  %12 = tail call i32 @__SSAT(i32 noundef %11, i32 noundef 16)
  %sext = shl i32 %12, 16
  %13 = ashr exact i32 %sext, 16
  %14 = mul nsw i32 %13, %13
  %15 = zext nneg i32 %14 to i64
  %16 = add nuw nsw i64 %.01317, %15
  %17 = add i32 %.01416, -1
  %.not = icmp eq i32 %17, 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 ], [ %16, %.lr.ph ]
  %18 = zext i32 %2 to i64
  %19 = udiv i64 %.013.lcssa, %18
  %20 = trunc i64 %19 to i32
  %21 = ashr i32 %20, 13
  %22 = tail call i32 @__SSAT(i32 noundef %21, i32 noundef 16)
  %23 = trunc i32 %22 to i16
  store i16 %23, ptr %3, align 2, !tbaa !5
  ret void
}

; Function Attrs: alwaysinline nounwind uwtable
declare hidden i32 @__SSAT(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 = !{!"short", !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,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass