; LLVM IR from ubaldot/defrecs :: stm32f4x/ADC_Readings/Drivers/CMSIS/DSP/Source/DistanceFunctions (f64)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind
declare double @sqrt(double noundef) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.fmuladd.f64(double, double, double) #2

; Function Attrs: nounwind uwtable
define dso_local double @arm_euclidean_distance_f64(ptr noundef %0, ptr noundef %1, i32 noundef %2) #3 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca double, align 8
  %8 = alloca double, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #4
  store double 0.000000e+00, ptr %7, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  br label %9

9:                                                ; preds = %12, %3
  %10 = load i32, ptr %6, align 4, !tbaa !9
  %11 = icmp ugt i32 %10, 0
  br i1 %11, label %12, label %26

12:                                               ; preds = %9
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = getelementptr inbounds double, ptr %13, i32 1
  store ptr %14, ptr %4, align 8, !tbaa !5
  %15 = load double, ptr %13, align 8, !tbaa !11
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = getelementptr inbounds double, ptr %16, i32 1
  store ptr %17, ptr %5, align 8, !tbaa !5
  %18 = load double, ptr %16, align 8, !tbaa !11
  %19 = fsub double %15, %18
  store double %19, ptr %8, align 8, !tbaa !11
  %20 = load double, ptr %8, align 8, !tbaa !11
  %21 = load double, ptr %8, align 8, !tbaa !11
  %22 = load double, ptr %7, align 8, !tbaa !11
  %23 = call double @llvm.fmuladd.f64(double %20, double %21, double %22)
  store double %23, ptr %7, align 8, !tbaa !11
  %24 = load i32, ptr %6, align 4, !tbaa !9
  %25 = add i32 %24, -1
  store i32 %25, ptr %6, align 4, !tbaa !9
  br label %9, !llvm.loop !13

26:                                               ; preds = %9
  %27 = load double, ptr %7, align 8, !tbaa !11
  %28 = call double @sqrt(double noundef %27) #4
  store double %28, ptr %8, align 8, !tbaa !11
  %29 = load double, ptr %8, align 8, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #4
  ret double %29
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind "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 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #3 = { 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 = !{!"double", !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: mustprogress nofree nounwind willreturn memory(write)
declare double @sqrt(double noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.fmuladd.f64(double, double, double) #1

; Function Attrs: nofree nounwind memory(readwrite, inaccessiblemem: write) uwtable
define dso_local double @arm_euclidean_distance_f64(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i32 noundef %2) local_unnamed_addr #2 {
  %.not11 = icmp eq i32 %2, 0
  br i1 %.not11, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %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
  %.015.prol = phi double [ %9, %.lr.ph.prol ], [ 0.000000e+00, %.lr.ph.preheader ]
  %.0814.prol = phi i32 [ %10, %.lr.ph.prol ], [ %2, %.lr.ph.preheader ]
  %.0913.prol = phi ptr [ %6, %.lr.ph.prol ], [ %1, %.lr.ph.preheader ]
  %.01012.prol = phi ptr [ %4, %.lr.ph.prol ], [ %0, %.lr.ph.preheader ]
  %prol.iter = phi i32 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader ]
  %4 = getelementptr inbounds i8, ptr %.01012.prol, i64 8
  %5 = load double, ptr %.01012.prol, align 8, !tbaa !5
  %6 = getelementptr inbounds i8, ptr %.0913.prol, i64 8
  %7 = load double, ptr %.0913.prol, align 8, !tbaa !5
  %8 = fsub double %5, %7
  %9 = tail call double @llvm.fmuladd.f64(double %8, double %8, double %.015.prol)
  %10 = add i32 %.0814.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 double [ poison, %.lr.ph.preheader ], [ %9, %.lr.ph.prol ]
  %.015.unr = phi double [ 0.000000e+00, %.lr.ph.preheader ], [ %9, %.lr.ph.prol ]
  %.0814.unr = phi i32 [ %2, %.lr.ph.preheader ], [ %10, %.lr.ph.prol ]
  %.0913.unr = phi ptr [ %1, %.lr.ph.preheader ], [ %6, %.lr.ph.prol ]
  %.01012.unr = phi ptr [ %0, %.lr.ph.preheader ], [ %4, %.lr.ph.prol ]
  %11 = icmp ult i32 %2, 4
  br i1 %11, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.015 = phi double [ %35, %.lr.ph ], [ %.015.unr, %.lr.ph.prol.loopexit ]
  %.0814 = phi i32 [ %36, %.lr.ph ], [ %.0814.unr, %.lr.ph.prol.loopexit ]
  %.0913 = phi ptr [ %32, %.lr.ph ], [ %.0913.unr, %.lr.ph.prol.loopexit ]
  %.01012 = phi ptr [ %30, %.lr.ph ], [ %.01012.unr, %.lr.ph.prol.loopexit ]
  %12 = getelementptr inbounds i8, ptr %.01012, i64 8
  %13 = load double, ptr %.01012, align 8, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %.0913, i64 8
  %15 = load double, ptr %.0913, align 8, !tbaa !5
  %16 = fsub double %13, %15
  %17 = tail call double @llvm.fmuladd.f64(double %16, double %16, double %.015)
  %18 = getelementptr inbounds i8, ptr %.01012, i64 16
  %19 = load double, ptr %12, align 8, !tbaa !5
  %20 = getelementptr inbounds i8, ptr %.0913, i64 16
  %21 = load double, ptr %14, align 8, !tbaa !5
  %22 = fsub double %19, %21
  %23 = tail call double @llvm.fmuladd.f64(double %22, double %22, double %17)
  %24 = getelementptr inbounds i8, ptr %.01012, i64 24
  %25 = load double, ptr %18, align 8, !tbaa !5
  %26 = getelementptr inbounds i8, ptr %.0913, i64 24
  %27 = load double, ptr %20, align 8, !tbaa !5
  %28 = fsub double %25, %27
  %29 = tail call double @llvm.fmuladd.f64(double %28, double %28, double %23)
  %30 = getelementptr inbounds i8, ptr %.01012, i64 32
  %31 = load double, ptr %24, align 8, !tbaa !5
  %32 = getelementptr inbounds i8, ptr %.0913, i64 32
  %33 = load double, ptr %26, align 8, !tbaa !5
  %34 = fsub double %31, %33
  %35 = tail call double @llvm.fmuladd.f64(double %34, double %34, double %29)
  %36 = add i32 %.0814, -4
  %.not.3 = icmp eq i32 %36, 0
  br i1 %.not.3, label %._crit_edge, label %.lr.ph, !llvm.loop !11

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %3
  %.0.lcssa = phi double [ 0.000000e+00, %3 ], [ %.lcssa.unr, %.lr.ph.prol.loopexit ], [ %35, %.lr.ph ]
  %37 = tail call double @sqrt(double noundef %.0.lcssa) #3
  ret double %37
}

attributes #0 = { mustprogress nofree nounwind willreturn memory(write) "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) }
attributes #2 = { nofree nounwind memory(readwrite, inaccessiblemem: write) 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 = !{!"double", !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