; LLVM IR from FedericaPaoli1/stm32-speech-recognition-and-traduction :: Drivers/CMSIS/DSP/Source/StatisticsFunctions (arm_rms_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_rms_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 i64, align 8
  %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) #4
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  store i64 0, ptr %8, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #4
  %10 = load i32, ptr %5, align 4, !tbaa !9
  store i32 %10, ptr %7, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %14, %3
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = icmp ugt i32 %12, 0
  br i1 %13, label %14, label %27

14:                                               ; preds = %11
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = getelementptr inbounds i32, ptr %15, i32 1
  store ptr %16, ptr %4, align 8, !tbaa !5
  %17 = load i32, ptr %15, align 4, !tbaa !9
  store i32 %17, ptr %9, align 4, !tbaa !9
  %18 = load i32, ptr %9, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = load i32, ptr %9, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = mul nsw i64 %19, %21
  %23 = load i64, ptr %8, align 8, !tbaa !11
  %24 = add i64 %23, %22
  store i64 %24, ptr %8, align 8, !tbaa !11
  %25 = load i32, ptr %7, align 4, !tbaa !9
  %26 = add i32 %25, -1
  store i32 %26, ptr %7, align 4, !tbaa !9
  br label %11, !llvm.loop !13

27:                                               ; preds = %11
  %28 = load i64, ptr %8, align 8, !tbaa !11
  %29 = load i32, ptr %5, align 4, !tbaa !9
  %30 = zext i32 %29 to i64
  %31 = udiv i64 %28, %30
  %32 = lshr i64 %31, 31
  %33 = call i32 @clip_q63_to_q31(i64 noundef %32)
  %34 = load ptr, ptr %6, align 8, !tbaa !5
  %35 = call i32 @arm_sqrt_q31(i32 noundef %33, ptr noundef %34)
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare i32 @arm_sqrt_q31(i32 noundef, ptr noundef) #2

; Function Attrs: alwaysinline nounwind uwtable
declare hidden i32 @clip_q63_to_q31(i64 noundef) #3

; 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 = { "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 = { 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 #4 = { 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_rms_q31(ptr nocapture noundef readonly %0, i32 noundef %1, ptr noundef %2) local_unnamed_addr #0 {
  %.not11 = icmp eq i32 %1, 0
  br i1 %.not11, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %xtraiter = and i32 %1, 3
  %4 = icmp ult i32 %1, 4
  br i1 %4, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i32 %1, -4
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %.014 = phi ptr [ %0, %.lr.ph.preheader.new ], [ %20, %.lr.ph ]
  %.0913 = phi i64 [ 0, %.lr.ph.preheader.new ], [ %24, %.lr.ph ]
  %niter = phi i32 [ 0, %.lr.ph.preheader.new ], [ %niter.next.3, %.lr.ph ]
  %5 = getelementptr inbounds i8, ptr %.014, i64 4
  %6 = load i32, ptr %.014, align 4, !tbaa !5
  %7 = sext i32 %6 to i64
  %8 = mul nsw i64 %7, %7
  %9 = add i64 %8, %.0913
  %10 = getelementptr inbounds i8, ptr %.014, i64 8
  %11 = load i32, ptr %5, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = mul nsw i64 %12, %12
  %14 = add i64 %13, %9
  %15 = getelementptr inbounds i8, ptr %.014, i64 12
  %16 = load i32, ptr %10, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = mul nsw i64 %17, %17
  %19 = add i64 %18, %14
  %20 = getelementptr inbounds i8, ptr %.014, i64 16
  %21 = load i32, ptr %15, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = mul nsw i64 %22, %22
  %24 = add i64 %23, %19
  %niter.next.3 = add i32 %niter, 4
  %niter.ncmp.3 = icmp eq i32 %niter.next.3, %unroll_iter
  br i1 %niter.ncmp.3, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !9

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.lcssa.ph = phi i64 [ poison, %.lr.ph.preheader ], [ %24, %.lr.ph ]
  %.014.unr = phi ptr [ %0, %.lr.ph.preheader ], [ %20, %.lr.ph ]
  %.0913.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %24, %.lr.ph ]
  %lcmp.mod.not = icmp eq i32 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil
  %.014.epil = phi ptr [ %25, %.lr.ph.epil ], [ %.014.unr, %._crit_edge.loopexit.unr-lcssa ]
  %.0913.epil = phi i64 [ %29, %.lr.ph.epil ], [ %.0913.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i32 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %25 = getelementptr inbounds i8, ptr %.014.epil, i64 4
  %26 = load i32, ptr %.014.epil, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = mul nsw i64 %27, %27
  %29 = add i64 %28, %.0913.epil
  %epil.iter.next = add i32 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i32 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %._crit_edge, label %.lr.ph.epil, !llvm.loop !11

._crit_edge:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil, %3
  %.09.lcssa = phi i64 [ 0, %3 ], [ %.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %29, %.lr.ph.epil ]
  %30 = zext i32 %1 to i64
  %31 = udiv i64 %.09.lcssa, %30
  %32 = lshr i64 %31, 31
  %33 = tail call i32 @clip_q63_to_q31(i64 noundef %32)
  %34 = tail call i32 @arm_sqrt_q31(i32 noundef %33, ptr noundef %2) #3
  ret void
}

declare i32 @arm_sqrt_q31(i32 noundef, ptr noundef) local_unnamed_addr #1

; Function Attrs: alwaysinline nounwind uwtable
declare hidden i32 @clip_q63_to_q31(i64 noundef) local_unnamed_addr #2

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 = { "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 #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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.unroll.disable"}


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