; LLVM IR from lichen-community-systems/signaletic :: hosts/daisy/vendor/libDaisy/Drivers/STM32H7xx_HAL_Driver/Src (usb)

; 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 ptr @USB_ReadPacket(ptr noundef %0, ptr noundef %1, i16 noundef zeroext %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i16, align 2
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i16 %2, ptr %6, align 2, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = ptrtoint ptr %11 to i32
  store i32 %12, ptr %7, align 4, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %13 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %13, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %14 = load i16, ptr %6, align 2, !tbaa !9
  %15 = zext i16 %14 to i32
  %16 = add i32 %15, 3
  %17 = udiv i32 %16, 4
  store i32 %17, ptr %10, align 4, !tbaa !11
  store i32 0, ptr %9, align 4, !tbaa !11
  br label %18

18:                                               ; preds = %32, %3
  %19 = load i32, ptr %9, align 4, !tbaa !11
  %20 = load i32, ptr %10, align 4, !tbaa !11
  %21 = icmp ult i32 %19, %20
  br i1 %21, label %22, label %35

22:                                               ; preds = %18
  %23 = load i32, ptr %7, align 4, !tbaa !11
  %24 = zext i32 %23 to i64
  %25 = add i64 %24, 4096
  %26 = add i64 %25, 0
  %27 = inttoptr i64 %26 to ptr
  %28 = load volatile i32, ptr %27, align 4, !tbaa !11
  %29 = load ptr, ptr %8, align 8, !tbaa !5
  store i32 %28, ptr %29, align 4, !tbaa !11
  %30 = load ptr, ptr %8, align 8, !tbaa !5
  %31 = getelementptr inbounds i32, ptr %30, i32 1
  store ptr %31, ptr %8, align 8, !tbaa !5
  br label %32

32:                                               ; preds = %22
  %33 = load i32, ptr %9, align 4, !tbaa !11
  %34 = add i32 %33, 1
  store i32 %34, ptr %9, align 4, !tbaa !11
  br label %18, !llvm.loop !13

35:                                               ; preds = %18
  %36 = load ptr, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret ptr %36
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"short", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !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: nofree norecurse nounwind uwtable
define dso_local ptr @USB_ReadPacket(ptr noundef %0, ptr noundef writeonly %1, i16 noundef zeroext %2) local_unnamed_addr #0 {
  %4 = zext i16 %2 to i32
  %5 = add nuw nsw i32 %4, 3
  %6 = lshr i32 %5, 2
  %.not = icmp eq i16 %2, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3
  %7 = ptrtoint ptr %0 to i64
  %8 = and i64 %7, 4294967295
  %9 = add nuw nsw i64 %8, 4096
  %10 = inttoptr i64 %9 to ptr
  %11 = add nsw i32 %6, -1
  %xtraiter = and i32 %6, 7
  %12 = icmp ult i32 %11, 7
  br i1 %12, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.new

.lr.ph.new:                                       ; preds = %.lr.ph
  %unroll_iter = and i32 %6, 32760
  br label %13

13:                                               ; preds = %13, %.lr.ph.new
  %.011 = phi ptr [ %1, %.lr.ph.new ], [ %29, %13 ]
  %niter = phi i32 [ 0, %.lr.ph.new ], [ %niter.next.7, %13 ]
  %14 = load volatile i32, ptr %10, align 4, !tbaa !5
  store i32 %14, ptr %.011, align 4, !tbaa !5
  %15 = getelementptr inbounds i8, ptr %.011, i64 4
  %16 = load volatile i32, ptr %10, align 4, !tbaa !5
  store i32 %16, ptr %15, align 4, !tbaa !5
  %17 = getelementptr inbounds i8, ptr %.011, i64 8
  %18 = load volatile i32, ptr %10, align 4, !tbaa !5
  store i32 %18, ptr %17, align 4, !tbaa !5
  %19 = getelementptr inbounds i8, ptr %.011, i64 12
  %20 = load volatile i32, ptr %10, align 4, !tbaa !5
  store i32 %20, ptr %19, align 4, !tbaa !5
  %21 = getelementptr inbounds i8, ptr %.011, i64 16
  %22 = load volatile i32, ptr %10, align 4, !tbaa !5
  store i32 %22, ptr %21, align 4, !tbaa !5
  %23 = getelementptr inbounds i8, ptr %.011, i64 20
  %24 = load volatile i32, ptr %10, align 4, !tbaa !5
  store i32 %24, ptr %23, align 4, !tbaa !5
  %25 = getelementptr inbounds i8, ptr %.011, i64 24
  %26 = load volatile i32, ptr %10, align 4, !tbaa !5
  store i32 %26, ptr %25, align 4, !tbaa !5
  %27 = getelementptr inbounds i8, ptr %.011, i64 28
  %28 = load volatile i32, ptr %10, align 4, !tbaa !5
  store i32 %28, ptr %27, align 4, !tbaa !5
  %29 = getelementptr inbounds i8, ptr %.011, i64 32
  %niter.next.7 = add i32 %niter, 8
  %niter.ncmp.7 = icmp eq i32 %niter.next.7, %unroll_iter
  br i1 %niter.ncmp.7, label %._crit_edge.loopexit.unr-lcssa, label %13, !llvm.loop !9

._crit_edge.loopexit.unr-lcssa:                   ; preds = %13, %.lr.ph
  %.lcssa.ph = phi ptr [ poison, %.lr.ph ], [ %29, %13 ]
  %.011.unr = phi ptr [ %1, %.lr.ph ], [ %29, %13 ]
  %lcmp.mod.not = icmp eq i32 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.epil.preheader

.epil.preheader:                                  ; preds = %._crit_edge.loopexit.unr-lcssa, %.epil.preheader
  %.011.epil = phi ptr [ %31, %.epil.preheader ], [ %.011.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i32 [ %epil.iter.next, %.epil.preheader ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %30 = load volatile i32, ptr %10, align 4, !tbaa !5
  store i32 %30, ptr %.011.epil, align 4, !tbaa !5
  %31 = getelementptr inbounds i8, ptr %.011.epil, i64 4
  %epil.iter.next = add i32 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i32 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %._crit_edge, label %.epil.preheader, !llvm.loop !11

._crit_edge:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.epil.preheader, %3
  %.0.lcssa = phi ptr [ %1, %3 ], [ %.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %31, %.epil.preheader ]
  ret ptr %.0.lcssa
}

attributes #0 = { nofree norecurse 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.unroll.disable"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass