; LLVM IR from FedericaPaoli1/stm32-speech-recognition-and-traduction :: Drivers/CMSIS/DSP/Source/BasicMathFunctions (arm_sub_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_sub_f32(ptr noundef %0, ptr noundef %1, ptr noundef %2, i32 noundef %3) #0 {
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store ptr %2, ptr %7, align 8, !tbaa !5
  store i32 %3, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %10 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %10, ptr %9, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %14, %4
  %12 = load i32, ptr %9, align 4, !tbaa !9
  %13 = icmp ugt i32 %12, 0
  br i1 %13, label %14, label %26

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

26:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  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 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 = { 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_sub_f32(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, ptr nocapture noundef writeonly %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = ptrtoint ptr %1 to i64
  %6 = ptrtoint ptr %0 to i64
  %7 = ptrtoint ptr %2 to i64
  %.not8 = icmp eq i32 %3, 0
  br i1 %.not8, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %4
  %8 = zext i32 %3 to i64
  %min.iters.check = icmp ult i32 %3, 8
  br i1 %min.iters.check, label %.lr.ph.preheader30, label %vector.memcheck

vector.memcheck:                                  ; preds = %.lr.ph.preheader
  %9 = sub i64 %7, %6
  %diff.check = icmp ult i64 %9, 32
  %10 = sub i64 %7, %5
  %diff.check13 = icmp ult i64 %10, 32
  %conflict.rdx = or i1 %diff.check, %diff.check13
  br i1 %conflict.rdx, label %.lr.ph.preheader30, label %vector.ph

vector.ph:                                        ; preds = %vector.memcheck
  %n.vec = and i64 %8, 4294967288
  %.cast = trunc nuw i64 %n.vec to i32
  %ind.end = sub i32 %3, %.cast
  %11 = shl nuw nsw i64 %n.vec, 2
  %ind.end14 = getelementptr i8, ptr %0, i64 %11
  %12 = shl nuw nsw i64 %n.vec, 2
  %ind.end16 = getelementptr i8, ptr %2, i64 %12
  %13 = shl nuw nsw i64 %n.vec, 2
  %ind.end18 = getelementptr i8, ptr %1, i64 %13
  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.idx21 = shl i64 %index, 2
  %next.gep22 = getelementptr i8, ptr %2, i64 %offset.idx21
  %offset.idx24 = shl i64 %index, 2
  %next.gep25 = getelementptr i8, ptr %1, i64 %offset.idx24
  %14 = getelementptr i8, ptr %next.gep, i64 16
  %wide.load = load <4 x float>, ptr %next.gep, align 4, !tbaa !5
  %wide.load27 = load <4 x float>, ptr %14, align 4, !tbaa !5
  %15 = getelementptr i8, ptr %next.gep25, i64 16
  %wide.load28 = load <4 x float>, ptr %next.gep25, align 4, !tbaa !5
  %wide.load29 = load <4 x float>, ptr %15, align 4, !tbaa !5
  %16 = fsub <4 x float> %wide.load, %wide.load28
  %17 = fsub <4 x float> %wide.load27, %wide.load29
  %18 = getelementptr i8, ptr %next.gep22, i64 16
  store <4 x float> %16, ptr %next.gep22, align 4, !tbaa !5
  store <4 x float> %17, ptr %18, align 4, !tbaa !5
  %index.next = add nuw i64 %index, 8
  %19 = icmp eq i64 %index.next, %n.vec
  br i1 %19, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %8
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader30

.lr.ph.preheader30:                               ; preds = %middle.block, %vector.memcheck, %.lr.ph.preheader
  %.012.ph = phi i32 [ %3, %vector.memcheck ], [ %3, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.0511.ph = phi ptr [ %0, %vector.memcheck ], [ %0, %.lr.ph.preheader ], [ %ind.end14, %middle.block ]
  %.0610.ph = phi ptr [ %2, %vector.memcheck ], [ %2, %.lr.ph.preheader ], [ %ind.end16, %middle.block ]
  %.079.ph = phi ptr [ %1, %vector.memcheck ], [ %1, %.lr.ph.preheader ], [ %ind.end18, %middle.block ]
  %20 = add i32 %.012.ph, -1
  %xtraiter = and i32 %.012.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.preheader30, %.lr.ph.prol
  %.012.prol = phi i32 [ %27, %.lr.ph.prol ], [ %.012.ph, %.lr.ph.preheader30 ]
  %.0511.prol = phi ptr [ %21, %.lr.ph.prol ], [ %.0511.ph, %.lr.ph.preheader30 ]
  %.0610.prol = phi ptr [ %26, %.lr.ph.prol ], [ %.0610.ph, %.lr.ph.preheader30 ]
  %.079.prol = phi ptr [ %23, %.lr.ph.prol ], [ %.079.ph, %.lr.ph.preheader30 ]
  %prol.iter = phi i32 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader30 ]
  %21 = getelementptr inbounds i8, ptr %.0511.prol, i64 4
  %22 = load float, ptr %.0511.prol, align 4, !tbaa !5
  %23 = getelementptr inbounds i8, ptr %.079.prol, i64 4
  %24 = load float, ptr %.079.prol, align 4, !tbaa !5
  %25 = fsub float %22, %24
  %26 = getelementptr inbounds i8, ptr %.0610.prol, i64 4
  store float %25, ptr %.0610.prol, align 4, !tbaa !5
  %27 = add i32 %.012.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.preheader30
  %.012.unr = phi i32 [ %.012.ph, %.lr.ph.preheader30 ], [ %27, %.lr.ph.prol ]
  %.0511.unr = phi ptr [ %.0511.ph, %.lr.ph.preheader30 ], [ %21, %.lr.ph.prol ]
  %.0610.unr = phi ptr [ %.0610.ph, %.lr.ph.preheader30 ], [ %26, %.lr.ph.prol ]
  %.079.unr = phi ptr [ %.079.ph, %.lr.ph.preheader30 ], [ %23, %.lr.ph.prol ]
  %28 = icmp ult i32 %20, 3
  br i1 %28, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.012 = phi i32 [ %53, %.lr.ph ], [ %.012.unr, %.lr.ph.prol.loopexit ]
  %.0511 = phi ptr [ %47, %.lr.ph ], [ %.0511.unr, %.lr.ph.prol.loopexit ]
  %.0610 = phi ptr [ %52, %.lr.ph ], [ %.0610.unr, %.lr.ph.prol.loopexit ]
  %.079 = phi ptr [ %49, %.lr.ph ], [ %.079.unr, %.lr.ph.prol.loopexit ]
  %29 = getelementptr inbounds i8, ptr %.0511, i64 4
  %30 = load float, ptr %.0511, align 4, !tbaa !5
  %31 = getelementptr inbounds i8, ptr %.079, i64 4
  %32 = load float, ptr %.079, align 4, !tbaa !5
  %33 = fsub float %30, %32
  %34 = getelementptr inbounds i8, ptr %.0610, i64 4
  store float %33, ptr %.0610, align 4, !tbaa !5
  %35 = getelementptr inbounds i8, ptr %.0511, i64 8
  %36 = load float, ptr %29, align 4, !tbaa !5
  %37 = getelementptr inbounds i8, ptr %.079, i64 8
  %38 = load float, ptr %31, align 4, !tbaa !5
  %39 = fsub float %36, %38
  %40 = getelementptr inbounds i8, ptr %.0610, i64 8
  store float %39, ptr %34, align 4, !tbaa !5
  %41 = getelementptr inbounds i8, ptr %.0511, i64 12
  %42 = load float, ptr %35, align 4, !tbaa !5
  %43 = getelementptr inbounds i8, ptr %.079, i64 12
  %44 = load float, ptr %37, align 4, !tbaa !5
  %45 = fsub float %42, %44
  %46 = getelementptr inbounds i8, ptr %.0610, i64 12
  store float %45, ptr %40, align 4, !tbaa !5
  %47 = getelementptr inbounds i8, ptr %.0511, i64 16
  %48 = load float, ptr %41, align 4, !tbaa !5
  %49 = getelementptr inbounds i8, ptr %.079, i64 16
  %50 = load float, ptr %43, align 4, !tbaa !5
  %51 = fsub float %48, %50
  %52 = getelementptr inbounds i8, ptr %.0610, i64 16
  store float %51, ptr %46, align 4, !tbaa !5
  %53 = add i32 %.012, -4
  %.not.3 = icmp eq i32 %53, 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, %4
  ret void
}

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" }

!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