; LLVM IR from FedericaPaoli1/stm32-speech-recognition-and-traduction :: Drivers/CMSIS/DSP/Source/BasicMathFunctions (arm_abs_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 void @arm_abs_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 i32, 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
  %8 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %8, ptr %7, align 4, !tbaa !9
  br label %9

9:                                                ; preds = %12, %3
  %10 = load i32, ptr %7, align 4, !tbaa !9
  %11 = icmp ugt i32 %10, 0
  br i1 %11, label %12, label %21

12:                                               ; preds = %9
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = getelementptr inbounds float, ptr %13, i32 1
  store ptr %14, ptr %4, align 8, !tbaa !5
  %15 = load float, ptr %13, align 4, !tbaa !11
  %16 = call float @llvm.fabs.f32(float %15)
  %17 = load ptr, ptr %5, align 8, !tbaa !5
  %18 = getelementptr inbounds float, ptr %17, i32 1
  store ptr %18, ptr %5, align 8, !tbaa !5
  store float %16, ptr %17, align 4, !tbaa !11
  %19 = load i32, ptr %7, align 4, !tbaa !9
  %20 = add i32 %19, -1
  store i32 %20, ptr %7, align 4, !tbaa !9
  br label %9, !llvm.loop !13

21:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #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: 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(readwrite, inaccessiblemem: none) uwtable
define dso_local void @arm_abs_f32(ptr nocapture noundef readonly %0, ptr nocapture noundef writeonly %1, i32 noundef %2) local_unnamed_addr #0 {
  %.not6 = icmp eq i32 %2, 0
  br i1 %.not6, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %4 = ptrtoint ptr %1 to i64
  %5 = ptrtoint ptr %0 to i64
  %6 = zext i32 %2 to i64
  %min.iters.check = icmp ult i32 %2, 8
  %7 = sub i64 %4, %5
  %diff.check = icmp ult i64 %7, 32
  %or.cond = or i1 %min.iters.check, %diff.check
  br i1 %or.cond, label %.lr.ph.preheader19, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %6, 4294967288
  %.cast = trunc nuw i64 %n.vec to i32
  %ind.end = sub i32 %2, %.cast
  %8 = shl nuw nsw i64 %n.vec, 2
  %ind.end10 = getelementptr i8, ptr %0, i64 %8
  %9 = shl nuw nsw i64 %n.vec, 2
  %ind.end12 = getelementptr i8, ptr %1, i64 %9
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %offset.idx = shl i64 %index, 2
  %next.gep = getelementptr i8, ptr %0, i64 %offset.idx
  %offset.idx15 = shl i64 %index, 2
  %next.gep16 = getelementptr i8, ptr %1, i64 %offset.idx15
  %10 = getelementptr i8, ptr %next.gep, i64 16
  %wide.load = load <4 x float>, ptr %next.gep, align 4, !tbaa !5
  %wide.load18 = load <4 x float>, ptr %10, align 4, !tbaa !5
  %11 = tail call <4 x float> @llvm.fabs.v4f32(<4 x float> %wide.load)
  %12 = tail call <4 x float> @llvm.fabs.v4f32(<4 x float> %wide.load18)
  %13 = getelementptr i8, ptr %next.gep16, i64 16
  store <4 x float> %11, ptr %next.gep16, align 4, !tbaa !5
  store <4 x float> %12, ptr %13, align 4, !tbaa !5
  %index.next = add nuw i64 %index, 8
  %14 = icmp eq i64 %index.next, %n.vec
  br i1 %14, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %6
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader19

.lr.ph.preheader19:                               ; preds = %middle.block, %.lr.ph.preheader
  %.09.ph = phi i32 [ %2, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.048.ph = phi ptr [ %0, %.lr.ph.preheader ], [ %ind.end10, %middle.block ]
  %.057.ph = phi ptr [ %1, %.lr.ph.preheader ], [ %ind.end12, %middle.block ]
  %15 = add i32 %.09.ph, -1
  %xtraiter = and i32 %.09.ph, 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.preheader19, %.lr.ph.prol
  %.09.prol = phi i32 [ %20, %.lr.ph.prol ], [ %.09.ph, %.lr.ph.preheader19 ]
  %.048.prol = phi ptr [ %16, %.lr.ph.prol ], [ %.048.ph, %.lr.ph.preheader19 ]
  %.057.prol = phi ptr [ %19, %.lr.ph.prol ], [ %.057.ph, %.lr.ph.preheader19 ]
  %prol.iter = phi i32 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader19 ]
  %16 = getelementptr inbounds i8, ptr %.048.prol, i64 4
  %17 = load float, ptr %.048.prol, align 4, !tbaa !5
  %18 = tail call float @llvm.fabs.f32(float %17)
  %19 = getelementptr inbounds i8, ptr %.057.prol, i64 4
  store float %18, ptr %.057.prol, align 4, !tbaa !5
  %20 = add i32 %.09.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 !13

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader19
  %.09.unr = phi i32 [ %.09.ph, %.lr.ph.preheader19 ], [ %20, %.lr.ph.prol ]
  %.048.unr = phi ptr [ %.048.ph, %.lr.ph.preheader19 ], [ %16, %.lr.ph.prol ]
  %.057.unr = phi ptr [ %.057.ph, %.lr.ph.preheader19 ], [ %19, %.lr.ph.prol ]
  %21 = icmp ult i32 %15, 3
  br i1 %21, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.09 = phi i32 [ %38, %.lr.ph ], [ %.09.unr, %.lr.ph.prol.loopexit ]
  %.048 = phi ptr [ %34, %.lr.ph ], [ %.048.unr, %.lr.ph.prol.loopexit ]
  %.057 = phi ptr [ %37, %.lr.ph ], [ %.057.unr, %.lr.ph.prol.loopexit ]
  %22 = getelementptr inbounds i8, ptr %.048, i64 4
  %23 = load float, ptr %.048, align 4, !tbaa !5
  %24 = tail call float @llvm.fabs.f32(float %23)
  %25 = getelementptr inbounds i8, ptr %.057, i64 4
  store float %24, ptr %.057, align 4, !tbaa !5
  %26 = getelementptr inbounds i8, ptr %.048, i64 8
  %27 = load float, ptr %22, align 4, !tbaa !5
  %28 = tail call float @llvm.fabs.f32(float %27)
  %29 = getelementptr inbounds i8, ptr %.057, i64 8
  store float %28, ptr %25, align 4, !tbaa !5
  %30 = getelementptr inbounds i8, ptr %.048, i64 12
  %31 = load float, ptr %26, align 4, !tbaa !5
  %32 = tail call float @llvm.fabs.f32(float %31)
  %33 = getelementptr inbounds i8, ptr %.057, i64 12
  store float %32, ptr %29, align 4, !tbaa !5
  %34 = getelementptr inbounds i8, ptr %.048, i64 16
  %35 = load float, ptr %30, align 4, !tbaa !5
  %36 = tail call float @llvm.fabs.f32(float %35)
  %37 = getelementptr inbounds i8, ptr %.057, i64 16
  store float %36, ptr %33, align 4, !tbaa !5
  %38 = add i32 %.09, -4
  %.not.3 = icmp eq i32 %38, 0
  br i1 %.not.3, label %._crit_edge, label %.lr.ph, !llvm.loop !15

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %middle.block, %3
  ret void
}

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

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare <4 x float> @llvm.fabs.v4f32(<4 x float>) #2

attributes #0 = { nofree norecurse nosync nounwind memory(readwrite, 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) }
attributes #2 = { 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, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.unroll.disable"}
!15 = distinct !{!15, !10, !11}


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