; LLVM IR from FedericaPaoli1/stm32-speech-recognition-and-traduction :: Drivers/CMSIS/DSP/Source/DistanceFunctions (arm_chebyshev_distance_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 float @arm_chebyshev_distance_f32(ptr noundef %0, ptr noundef %1, i32 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca float, align 4
  %8 = alloca float, align 4
  %9 = alloca float, align 4
  %10 = alloca float, align 4
  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 4, ptr %7) #3
  store float 0.000000e+00, ptr %7, align 4, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = getelementptr inbounds float, ptr %11, i32 1
  store ptr %12, ptr %4, align 8, !tbaa !5
  %13 = load float, ptr %11, align 4, !tbaa !11
  store float %13, ptr %9, align 4, !tbaa !11
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = getelementptr inbounds float, ptr %14, i32 1
  store ptr %15, ptr %5, align 8, !tbaa !5
  %16 = load float, ptr %14, align 4, !tbaa !11
  store float %16, ptr %10, align 4, !tbaa !11
  %17 = load float, ptr %9, align 4, !tbaa !11
  %18 = load float, ptr %10, align 4, !tbaa !11
  %19 = fsub float %17, %18
  %20 = call float @llvm.fabs.f32(float %19)
  store float %20, ptr %7, align 4, !tbaa !11
  %21 = load float, ptr %7, align 4, !tbaa !11
  store float %21, ptr %8, align 4, !tbaa !11
  %22 = load i32, ptr %6, align 4, !tbaa !9
  %23 = add i32 %22, -1
  store i32 %23, ptr %6, align 4, !tbaa !9
  br label %24

24:                                               ; preds = %43, %3
  %25 = load i32, ptr %6, align 4, !tbaa !9
  %26 = icmp ugt i32 %25, 0
  br i1 %26, label %27, label %46

27:                                               ; preds = %24
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  %29 = getelementptr inbounds float, ptr %28, i32 1
  store ptr %29, ptr %4, align 8, !tbaa !5
  %30 = load float, ptr %28, align 4, !tbaa !11
  store float %30, ptr %9, align 4, !tbaa !11
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = getelementptr inbounds float, ptr %31, i32 1
  store ptr %32, ptr %5, align 8, !tbaa !5
  %33 = load float, ptr %31, align 4, !tbaa !11
  store float %33, ptr %10, align 4, !tbaa !11
  %34 = load float, ptr %9, align 4, !tbaa !11
  %35 = load float, ptr %10, align 4, !tbaa !11
  %36 = fsub float %34, %35
  %37 = call float @llvm.fabs.f32(float %36)
  store float %37, ptr %7, align 4, !tbaa !11
  %38 = load float, ptr %7, align 4, !tbaa !11
  %39 = load float, ptr %8, align 4, !tbaa !11
  %40 = fcmp ogt float %38, %39
  br i1 %40, label %41, label %43

41:                                               ; preds = %27
  %42 = load float, ptr %7, align 4, !tbaa !11
  store float %42, ptr %8, align 4, !tbaa !11
  br label %43

43:                                               ; preds = %41, %27
  %44 = load i32, ptr %6, align 4, !tbaa !9
  %45 = add i32 %44, -1
  store i32 %45, ptr %6, align 4, !tbaa !9
  br label %24, !llvm.loop !13

46:                                               ; preds = %24
  %47 = load float, ptr %8, align 4, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  ret float %47
}

; 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.fabs.f32(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, inaccessiblemem: none) uwtable
define dso_local float @arm_chebyshev_distance_f32(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = load float, ptr %0, align 4, !tbaa !5
  %5 = load float, ptr %1, align 4, !tbaa !5
  %6 = fsub float %4, %5
  %7 = tail call float @llvm.fabs.f32(float %6)
  %.01520 = add i32 %2, -1
  %.not21 = icmp eq i32 %.01520, 0
  br i1 %.not21, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %xtraiter = and i32 %.01520, 1
  %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
  %.017.prol = getelementptr inbounds i8, ptr %0, i64 4
  %.016.prol = getelementptr inbounds i8, ptr %1, i64 4
  %8 = load float, ptr %.017.prol, align 4, !tbaa !5
  %9 = load float, ptr %.016.prol, align 4, !tbaa !5
  %10 = fsub float %8, %9
  %11 = tail call float @llvm.fabs.f32(float %10)
  %12 = fcmp ogt float %11, %7
  %.1.prol = select i1 %12, float %11, float %7
  %.015.prol = add i32 %2, -2
  br label %.lr.ph.prol.loopexit

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader
  %.1.lcssa.unr = phi float [ poison, %.lr.ph.preheader ], [ %.1.prol, %.lr.ph.prol ]
  %.01525.unr = phi i32 [ %.01520, %.lr.ph.preheader ], [ %.015.prol, %.lr.ph.prol ]
  %.024.unr = phi float [ %7, %.lr.ph.preheader ], [ %.1.prol, %.lr.ph.prol ]
  %.pn1923.unr = phi ptr [ %1, %.lr.ph.preheader ], [ %.016.prol, %.lr.ph.prol ]
  %.pn22.unr = phi ptr [ %0, %.lr.ph.preheader ], [ %.017.prol, %.lr.ph.prol ]
  %13 = icmp eq i32 %2, 2
  br i1 %13, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.01525 = phi i32 [ %.015.1, %.lr.ph ], [ %.01525.unr, %.lr.ph.prol.loopexit ]
  %.024 = phi float [ %.1.1, %.lr.ph ], [ %.024.unr, %.lr.ph.prol.loopexit ]
  %.pn1923 = phi ptr [ %.016.1, %.lr.ph ], [ %.pn1923.unr, %.lr.ph.prol.loopexit ]
  %.pn22 = phi ptr [ %.017.1, %.lr.ph ], [ %.pn22.unr, %.lr.ph.prol.loopexit ]
  %.017 = getelementptr inbounds i8, ptr %.pn22, i64 4
  %.016 = getelementptr inbounds i8, ptr %.pn1923, i64 4
  %14 = load float, ptr %.017, align 4, !tbaa !5
  %15 = load float, ptr %.016, align 4, !tbaa !5
  %16 = fsub float %14, %15
  %17 = tail call float @llvm.fabs.f32(float %16)
  %18 = fcmp ogt float %17, %.024
  %.1 = select i1 %18, float %17, float %.024
  %.017.1 = getelementptr inbounds i8, ptr %.pn22, i64 8
  %.016.1 = getelementptr inbounds i8, ptr %.pn1923, i64 8
  %19 = load float, ptr %.017.1, align 4, !tbaa !5
  %20 = load float, ptr %.016.1, align 4, !tbaa !5
  %21 = fsub float %19, %20
  %22 = tail call float @llvm.fabs.f32(float %21)
  %23 = fcmp ogt float %22, %.1
  %.1.1 = select i1 %23, float %22, float %.1
  %.015.1 = add i32 %.01525, -2
  %.not.1 = icmp eq i32 %.015.1, 0
  br i1 %.not.1, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %3
  %.0.lcssa = phi float [ %7, %3 ], [ %.1.lcssa.unr, %.lr.ph.prol.loopexit ], [ %.1.1, %.lr.ph ]
  ret float %.0.lcssa
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare float @llvm.fabs.f32(float) #1

attributes #0 = { nofree norecurse nosync nounwind memory(read, 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.mustprogress"}


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