; LLVM IR from thomasfla/Linux-ESPNOW :: ESPNOW_lib/src/ESPNOW_types.ll (ZN13ESPNOW_packet16get_radiotap_lenEPhi)

; 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: mustprogress nounwind uwtable
define dso_local noundef i32 @_ZN13ESPNOW_packet16get_radiotap_lenEPhi(ptr noundef %0, i32 noundef %1) #0 align 2 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %6 = load i32, ptr %5, align 4, !tbaa !9
  %7 = icmp slt i32 %6, 4
  br i1 %7, label %8, label %9

8:                                                ; preds = %2
  store i32 -1, ptr %3, align 4
  br label %20

9:                                                ; preds = %2
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = getelementptr inbounds i8, ptr %10, i64 2
  %12 = load i8, ptr %11, align 1, !tbaa !11
  %13 = zext i8 %12 to i32
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = getelementptr inbounds i8, ptr %14, i64 3
  %16 = load i8, ptr %15, align 1, !tbaa !11
  %17 = zext i8 %16 to i32
  %18 = shl i32 %17, 8
  %19 = add nsw i32 %13, %18
  store i32 %19, ptr %3, align 4
  br label %20

20:                                               ; preds = %9, %8
  %21 = load i32, ptr %3, align 4
  ret i32 %21
}

attributes #0 = { mustprogress 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!7, !7, i64 0}


; 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: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef range(i32 -1, 65536) i32 @_ZN13ESPNOW_packet16get_radiotap_lenEPhi(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 align 2 {
  %3 = icmp slt i32 %1, 4
  br i1 %3, label %8, label %4

4:                                                ; preds = %2
  %5 = getelementptr inbounds i8, ptr %0, i64 2
  %6 = load i16, ptr %5, align 1
  %7 = zext i16 %6 to i32
  br label %8

8:                                                ; preds = %2, %4
  %.0 = phi i32 [ %7, %4 ], [ -1, %2 ]
  ret i32 %.0
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) 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)"}


; Effective O3 passes: AggressiveInstCombinePass,GlobalOptPass,IPSCCPPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass