; LLVM IR from FedericaPaoli1/stm32-speech-recognition-and-traduction :: Drivers/CMSIS/DSP/Source/BasicMathFunctions (arm_abs_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_abs_q31(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
  %8 = 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) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %9 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %9, ptr %7, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %30, %3
  %11 = load i32, ptr %7, align 4, !tbaa !9
  %12 = icmp ugt i32 %11, 0
  br i1 %12, label %13, label %36

13:                                               ; preds = %10
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = getelementptr inbounds i32, ptr %14, i32 1
  store ptr %15, ptr %4, align 8, !tbaa !5
  %16 = load i32, ptr %14, align 4, !tbaa !9
  store i32 %16, ptr %8, align 4, !tbaa !9
  %17 = load i32, ptr %8, align 4, !tbaa !9
  %18 = icmp sgt i32 %17, 0
  br i1 %18, label %19, label %21

19:                                               ; preds = %13
  %20 = load i32, ptr %8, align 4, !tbaa !9
  br label %30

21:                                               ; preds = %13
  %22 = load i32, ptr %8, align 4, !tbaa !9
  %23 = icmp eq i32 %22, -2147483648
  br i1 %23, label %24, label %25

24:                                               ; preds = %21
  br label %28

25:                                               ; preds = %21
  %26 = load i32, ptr %8, align 4, !tbaa !9
  %27 = sub nsw i32 0, %26
  br label %28

28:                                               ; preds = %25, %24
  %29 = phi i32 [ 2147483647, %24 ], [ %27, %25 ]
  br label %30

30:                                               ; preds = %28, %19
  %31 = phi i32 [ %20, %19 ], [ %29, %28 ]
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  %33 = getelementptr inbounds i32, ptr %32, i32 1
  store ptr %33, ptr %5, align 8, !tbaa !5
  store i32 %31, ptr %32, align 4, !tbaa !9
  %34 = load i32, ptr %7, align 4, !tbaa !9
  %35 = add i32 %34, -1
  store i32 %35, ptr %7, align 4, !tbaa !9
  br label %10, !llvm.loop !11

36:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #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 = distinct !{!11, !12}
!12 = !{!"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_q31(ptr nocapture noundef readonly %0, ptr nocapture noundef writeonly %1, i32 noundef %2) local_unnamed_addr #0 {
  %.not11 = icmp eq i32 %2, 0
  br i1 %.not11, 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.preheader24, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %6, 4294967288
  %8 = shl nuw nsw i64 %n.vec, 2
  %ind.end = getelementptr i8, ptr %0, i64 %8
  %.cast = trunc nuw i64 %n.vec to i32
  %ind.end15 = sub i32 %2, %.cast
  %9 = shl nuw nsw i64 %n.vec, 2
  %ind.end17 = 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.idx20 = shl i64 %index, 2
  %next.gep21 = getelementptr i8, ptr %1, i64 %offset.idx20
  %10 = getelementptr i8, ptr %next.gep, i64 16
  %wide.load = load <4 x i32>, ptr %next.gep, align 4, !tbaa !5
  %wide.load23 = load <4 x i32>, ptr %10, align 4, !tbaa !5
  %11 = icmp sgt <4 x i32> %wide.load, zeroinitializer
  %12 = icmp sgt <4 x i32> %wide.load23, zeroinitializer
  %13 = icmp eq <4 x i32> %wide.load, <i32 -2147483648, i32 -2147483648, i32 -2147483648, i32 -2147483648>
  %14 = icmp eq <4 x i32> %wide.load23, <i32 -2147483648, i32 -2147483648, i32 -2147483648, i32 -2147483648>
  %15 = sub nsw <4 x i32> zeroinitializer, %wide.load
  %16 = sub nsw <4 x i32> zeroinitializer, %wide.load23
  %17 = select <4 x i1> %13, <4 x i32> <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>, <4 x i32> %15
  %18 = select <4 x i1> %14, <4 x i32> <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>, <4 x i32> %16
  %19 = select <4 x i1> %11, <4 x i32> %wide.load, <4 x i32> %17
  %20 = select <4 x i1> %12, <4 x i32> %wide.load23, <4 x i32> %18
  %21 = getelementptr i8, ptr %next.gep21, i64 16
  store <4 x i32> %19, ptr %next.gep21, align 4, !tbaa !5
  store <4 x i32> %20, ptr %21, align 4, !tbaa !5
  %index.next = add nuw i64 %index, 8
  %22 = icmp eq i64 %index.next, %n.vec
  br i1 %22, 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.preheader24

.lr.ph.preheader24:                               ; preds = %middle.block, %.lr.ph.preheader
  %.014.ph = phi ptr [ %0, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.0813.ph = phi i32 [ %2, %.lr.ph.preheader ], [ %ind.end15, %middle.block ]
  %.0912.ph = phi ptr [ %1, %.lr.ph.preheader ], [ %ind.end17, %middle.block ]
  %xtraiter = and i32 %.0813.ph, 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.preheader24
  %23 = getelementptr inbounds i8, ptr %.014.ph, i64 4
  %24 = load i32, ptr %.014.ph, align 4, !tbaa !5
  %25 = icmp sgt i32 %24, 0
  %26 = icmp eq i32 %24, -2147483648
  %27 = sub nsw i32 0, %24
  %28 = select i1 %26, i32 2147483647, i32 %27
  %29 = select i1 %25, i32 %24, i32 %28
  %30 = getelementptr inbounds i8, ptr %.0912.ph, i64 4
  store i32 %29, ptr %.0912.ph, align 4, !tbaa !5
  %31 = add nsw i32 %.0813.ph, -1
  br label %.lr.ph.prol.loopexit

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader24
  %.014.unr = phi ptr [ %.014.ph, %.lr.ph.preheader24 ], [ %23, %.lr.ph.prol ]
  %.0813.unr = phi i32 [ %.0813.ph, %.lr.ph.preheader24 ], [ %31, %.lr.ph.prol ]
  %.0912.unr = phi ptr [ %.0912.ph, %.lr.ph.preheader24 ], [ %30, %.lr.ph.prol ]
  %32 = icmp eq i32 %.0813.ph, 1
  br i1 %32, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.014 = phi ptr [ %41, %.lr.ph ], [ %.014.unr, %.lr.ph.prol.loopexit ]
  %.0813 = phi i32 [ %49, %.lr.ph ], [ %.0813.unr, %.lr.ph.prol.loopexit ]
  %.0912 = phi ptr [ %48, %.lr.ph ], [ %.0912.unr, %.lr.ph.prol.loopexit ]
  %33 = getelementptr inbounds i8, ptr %.014, i64 4
  %34 = load i32, ptr %.014, align 4, !tbaa !5
  %35 = icmp sgt i32 %34, 0
  %36 = icmp eq i32 %34, -2147483648
  %37 = sub nsw i32 0, %34
  %38 = select i1 %36, i32 2147483647, i32 %37
  %39 = select i1 %35, i32 %34, i32 %38
  %40 = getelementptr inbounds i8, ptr %.0912, i64 4
  store i32 %39, ptr %.0912, align 4, !tbaa !5
  %41 = getelementptr inbounds i8, ptr %.014, i64 8
  %42 = load i32, ptr %33, align 4, !tbaa !5
  %43 = icmp sgt i32 %42, 0
  %44 = icmp eq i32 %42, -2147483648
  %45 = sub nsw i32 0, %42
  %46 = select i1 %44, i32 2147483647, i32 %45
  %47 = select i1 %43, i32 %42, i32 %46
  %48 = getelementptr inbounds i8, ptr %.0912, i64 8
  store i32 %47, ptr %40, align 4, !tbaa !5
  %49 = add i32 %.0813, -2
  %.not.1 = icmp eq i32 %49, 0
  br i1 %.not.1, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %middle.block, %3
  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 = !{!"int", !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, !10, !11}


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