; LLVM IR from cvra/robot-software :: uwb-beacon-firmware/src/decadriver (deca_device)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local void @dwt_write32bitoffsetreg(i32 noundef %0, i32 noundef %1, i64 noundef %2) #1 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  %8 = alloca [4 x i8], align 1
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  store i64 %2, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  store i32 0, ptr %7, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %21, %3
  %10 = load i32, ptr %7, align 4, !tbaa !5
  %11 = icmp slt i32 %10, 4
  br i1 %11, label %12, label %24

12:                                               ; preds = %9
  %13 = load i64, ptr %6, align 8, !tbaa !9
  %14 = and i64 %13, 255
  %15 = trunc i64 %14 to i8
  %16 = load i32, ptr %7, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [4 x i8], ptr %8, i64 0, i64 %17
  store i8 %15, ptr %18, align 1, !tbaa !11
  %19 = load i64, ptr %6, align 8, !tbaa !9
  %20 = lshr i64 %19, 8
  store i64 %20, ptr %6, align 8, !tbaa !9
  br label %21

21:                                               ; preds = %12
  %22 = load i32, ptr %7, align 4, !tbaa !5
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %7, align 4, !tbaa !5
  br label %9, !llvm.loop !12

24:                                               ; preds = %9
  %25 = load i32, ptr %4, align 4, !tbaa !5
  %26 = trunc i32 %25 to i16
  %27 = load i32, ptr %5, align 4, !tbaa !5
  %28 = trunc i32 %27 to i16
  %29 = getelementptr inbounds [4 x i8], ptr %8, i64 0, i64 0
  call void @dwt_writetodevice(i16 noundef zeroext %26, i16 noundef zeroext %28, i64 noundef 4, ptr noundef %29)
  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: nounwind uwtable
declare dso_local void @dwt_writetodevice(i16 noundef zeroext, i16 noundef zeroext, i64 noundef, ptr noundef) #1

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!7, !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: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local void @dwt_write32bitoffsetreg(i32 noundef %0, i32 noundef %1, i64 noundef %2) local_unnamed_addr #1 {
  %4 = alloca [4 x i8], align 1
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #2
  %5 = trunc i64 %2 to i8
  store i8 %5, ptr %4, align 1, !tbaa !5
  %6 = lshr i64 %2, 8
  %7 = trunc i64 %6 to i8
  %8 = getelementptr inbounds i8, ptr %4, i64 1
  store i8 %7, ptr %8, align 1, !tbaa !5
  %9 = lshr i64 %2, 16
  %10 = trunc i64 %9 to i8
  %11 = getelementptr inbounds i8, ptr %4, i64 2
  store i8 %10, ptr %11, align 1, !tbaa !5
  %12 = lshr i64 %2, 24
  %13 = trunc i64 %12 to i8
  %14 = getelementptr inbounds i8, ptr %4, i64 3
  store i8 %13, ptr %14, align 1, !tbaa !5
  %15 = trunc i32 %0 to i16
  %16 = trunc i32 %1 to i16
  call void @dwt_writetodevice(i16 noundef zeroext %15, i16 noundef zeroext %16, i64 noundef 4, ptr noundef nonnull %4)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #2
  ret void
}

; Function Attrs: nounwind uwtable
declare dso_local void @dwt_writetodevice(i16 noundef zeroext, i16 noundef zeroext, i64 noundef, ptr noundef) local_unnamed_addr #1

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,SROAPass,SimplifyCFGPass