; LLVM IR from FedericaPaoli1/stm32-speech-recognition-and-traduction :: Drivers/CMSIS/DSP/Source/BasicMathFunctions (arm_sub_q15)

; 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_q15(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) #3
  %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 %30

14:                                               ; preds = %11
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = getelementptr inbounds i16, ptr %15, i32 1
  store ptr %16, ptr %5, align 8, !tbaa !5
  %17 = load i16, ptr %15, align 2, !tbaa !11
  %18 = sext i16 %17 to i32
  %19 = load ptr, ptr %6, align 8, !tbaa !5
  %20 = getelementptr inbounds i16, ptr %19, i32 1
  store ptr %20, ptr %6, align 8, !tbaa !5
  %21 = load i16, ptr %19, align 2, !tbaa !11
  %22 = sext i16 %21 to i32
  %23 = sub nsw i32 %18, %22
  %24 = call i32 @__SSAT(i32 noundef %23, i32 noundef 16)
  %25 = trunc i32 %24 to i16
  %26 = load ptr, ptr %7, align 8, !tbaa !5
  %27 = getelementptr inbounds i16, ptr %26, i32 1
  store ptr %27, ptr %7, align 8, !tbaa !5
  store i16 %25, ptr %26, align 2, !tbaa !11
  %28 = load i32, ptr %9, align 4, !tbaa !9
  %29 = add i32 %28, -1
  store i32 %29, ptr %9, align 4, !tbaa !9
  br label %11, !llvm.loop !13

30:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #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: alwaysinline nounwind uwtable
declare hidden i32 @__SSAT(i32 noundef, i32 noundef) #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 = { alwaysinline 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 #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 = !{!"short", !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: nounwind uwtable
define dso_local void @arm_sub_q15(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, ptr nocapture noundef writeonly %2, i32 noundef %3) local_unnamed_addr #0 {
  %.not8 = icmp eq i32 %3, 0
  br i1 %.not8, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %4, %.lr.ph
  %.012 = phi i32 [ %15, %.lr.ph ], [ %3, %4 ]
  %.0511 = phi ptr [ %5, %.lr.ph ], [ %0, %4 ]
  %.0610 = phi ptr [ %14, %.lr.ph ], [ %2, %4 ]
  %.079 = phi ptr [ %8, %.lr.ph ], [ %1, %4 ]
  %5 = getelementptr inbounds i8, ptr %.0511, i64 2
  %6 = load i16, ptr %.0511, align 2, !tbaa !5
  %7 = sext i16 %6 to i32
  %8 = getelementptr inbounds i8, ptr %.079, i64 2
  %9 = load i16, ptr %.079, align 2, !tbaa !5
  %10 = sext i16 %9 to i32
  %11 = sub nsw i32 %7, %10
  %12 = tail call i32 @__SSAT(i32 noundef %11, i32 noundef 16)
  %13 = trunc i32 %12 to i16
  %14 = getelementptr inbounds i8, ptr %.0610, i64 2
  store i16 %13, ptr %.0610, align 2, !tbaa !5
  %15 = add i32 %.012, -1
  %.not = icmp eq i32 %15, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %4
  ret void
}

; Function Attrs: alwaysinline nounwind uwtable
declare hidden i32 @__SSAT(i32 noundef, i32 noundef) local_unnamed_addr #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 = { alwaysinline 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" }

!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 = !{!"short", !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: GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass