; LLVM IR from FedericaPaoli1/stm32-speech-recognition-and-traduction :: Drivers/CMSIS/DSP/Source/BasicMathFunctions (arm_scale_q7)

; 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_scale_q7(ptr noundef %0, i8 noundef signext %1, i8 noundef signext %2, ptr noundef %3, i32 noundef %4) #0 {
  %6 = alloca ptr, align 8
  %7 = alloca i8, align 1
  %8 = alloca i8, align 1
  %9 = alloca ptr, align 8
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  %12 = alloca i8, align 1
  store ptr %0, ptr %6, align 8, !tbaa !5
  store i8 %1, ptr %7, align 1, !tbaa !9
  store i8 %2, ptr %8, align 1, !tbaa !9
  store ptr %3, ptr %9, align 8, !tbaa !5
  store i32 %4, ptr %10, align 4, !tbaa !10
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #3
  call void @llvm.lifetime.start.p0(i64 1, ptr %12) #3
  %13 = load i8, ptr %8, align 1, !tbaa !9
  %14 = sext i8 %13 to i32
  %15 = sub nsw i32 7, %14
  %16 = trunc i32 %15 to i8
  store i8 %16, ptr %12, align 1, !tbaa !9
  %17 = load i32, ptr %10, align 4, !tbaa !10
  store i32 %17, ptr %11, align 4, !tbaa !10
  br label %18

18:                                               ; preds = %21, %5
  %19 = load i32, ptr %11, align 4, !tbaa !10
  %20 = icmp ugt i32 %19, 0
  br i1 %20, label %21, label %39

21:                                               ; preds = %18
  %22 = load ptr, ptr %6, align 8, !tbaa !5
  %23 = getelementptr inbounds i8, ptr %22, i32 1
  store ptr %23, ptr %6, align 8, !tbaa !5
  %24 = load i8, ptr %22, align 1, !tbaa !9
  %25 = sext i8 %24 to i16
  %26 = sext i16 %25 to i32
  %27 = load i8, ptr %7, align 1, !tbaa !9
  %28 = sext i8 %27 to i32
  %29 = mul nsw i32 %26, %28
  %30 = load i8, ptr %12, align 1, !tbaa !9
  %31 = sext i8 %30 to i32
  %32 = ashr i32 %29, %31
  %33 = call i32 @__SSAT(i32 noundef %32, i32 noundef 8)
  %34 = trunc i32 %33 to i8
  %35 = load ptr, ptr %9, align 8, !tbaa !5
  %36 = getelementptr inbounds i8, ptr %35, i32 1
  store ptr %36, ptr %9, align 8, !tbaa !5
  store i8 %34, ptr %35, align 1, !tbaa !9
  %37 = load i32, ptr %11, align 4, !tbaa !10
  %38 = add i32 %37, -1
  store i32 %38, ptr %11, align 4, !tbaa !10
  br label %18, !llvm.loop !12

39:                                               ; preds = %18
  call void @llvm.lifetime.end.p0(i64 1, ptr %12) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #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 = !{!7, !7, i64 0}
!10 = !{!11, !11, i64 0}
!11 = !{!"int", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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_scale_q7(ptr nocapture noundef readonly %0, i8 noundef signext %1, i8 noundef signext %2, ptr nocapture noundef writeonly %3, i32 noundef %4) local_unnamed_addr #0 {
  %.not9 = icmp eq i32 %4, 0
  br i1 %.not9, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %5
  %6 = sub i8 7, %2
  %7 = sext i8 %1 to i32
  %8 = zext nneg i8 %6 to i32
  br label %9

9:                                                ; preds = %.lr.ph, %9
  %.012 = phi ptr [ %0, %.lr.ph ], [ %10, %9 ]
  %.0711 = phi i32 [ %4, %.lr.ph ], [ %18, %9 ]
  %.0810 = phi ptr [ %3, %.lr.ph ], [ %17, %9 ]
  %10 = getelementptr inbounds i8, ptr %.012, i64 1
  %11 = load i8, ptr %.012, align 1, !tbaa !5
  %12 = sext i8 %11 to i32
  %13 = mul nsw i32 %12, %7
  %14 = ashr i32 %13, %8
  %15 = tail call i32 @__SSAT(i32 noundef %14, i32 noundef 8)
  %16 = trunc i32 %15 to i8
  %17 = getelementptr inbounds i8, ptr %.0810, i64 1
  store i8 %16, ptr %.0810, align 1, !tbaa !5
  %18 = add i32 %.0711, -1
  %.not = icmp eq i32 %18, 0
  br i1 %.not, label %._crit_edge, label %9, !llvm.loop !8

._crit_edge:                                      ; preds = %9, %5
  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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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