; LLVM IR from lfarcaro/ARINC653_ARMV7A_AM335X :: Hardware (uart_irda_cir)

; 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 i32 @UARTFIFOWrite(i32 noundef %0, ptr noundef %1, i32 noundef %2) #1 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  store i32 %2, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !5
  store i32 0, ptr %7, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %21, %3
  %9 = load i32, ptr %7, align 4, !tbaa !5
  %10 = load i32, ptr %6, align 4, !tbaa !5
  %11 = icmp ult i32 %9, %10
  br i1 %11, label %12, label %24

12:                                               ; preds = %8
  %13 = load ptr, ptr %5, align 8, !tbaa !9
  %14 = getelementptr inbounds i8, ptr %13, i32 1
  store ptr %14, ptr %5, align 8, !tbaa !9
  %15 = load i8, ptr %13, align 1, !tbaa !11
  %16 = zext i8 %15 to i32
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = add i32 %17, 0
  %19 = zext i32 %18 to i64
  %20 = inttoptr i64 %19 to ptr
  store volatile i32 %16, ptr %20, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %12
  %22 = load i32, ptr %7, align 4, !tbaa !5
  %23 = add i32 %22, 1
  store i32 %23, ptr %7, align 4, !tbaa !5
  br label %8, !llvm.loop !12

24:                                               ; preds = %8
  %25 = load i32, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 %25
}

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 = !{!"any pointer", !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: nofree norecurse nounwind uwtable
define dso_local noundef i32 @UARTFIFOWrite(i32 noundef %0, ptr nocapture noundef readonly %1, i32 noundef returned %2) local_unnamed_addr #0 {
  %.not = icmp eq i32 %2, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3
  %4 = zext i32 %0 to i64
  %5 = inttoptr i64 %4 to ptr
  %xtraiter = and i32 %2, 7
  %6 = icmp ult i32 %2, 8
  br i1 %6, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.new

.lr.ph.new:                                       ; preds = %.lr.ph
  %unroll_iter = and i32 %2, -8
  br label %7

7:                                                ; preds = %7, %.lr.ph.new
  %.056 = phi ptr [ %1, %.lr.ph.new ], [ %29, %7 ]
  %niter = phi i32 [ 0, %.lr.ph.new ], [ %niter.next.7, %7 ]
  %8 = getelementptr inbounds i8, ptr %.056, i64 1
  %9 = load i8, ptr %.056, align 1, !tbaa !5
  %10 = zext i8 %9 to i32
  store volatile i32 %10, ptr %5, align 4, !tbaa !8
  %11 = getelementptr inbounds i8, ptr %.056, i64 2
  %12 = load i8, ptr %8, align 1, !tbaa !5
  %13 = zext i8 %12 to i32
  store volatile i32 %13, ptr %5, align 4, !tbaa !8
  %14 = getelementptr inbounds i8, ptr %.056, i64 3
  %15 = load i8, ptr %11, align 1, !tbaa !5
  %16 = zext i8 %15 to i32
  store volatile i32 %16, ptr %5, align 4, !tbaa !8
  %17 = getelementptr inbounds i8, ptr %.056, i64 4
  %18 = load i8, ptr %14, align 1, !tbaa !5
  %19 = zext i8 %18 to i32
  store volatile i32 %19, ptr %5, align 4, !tbaa !8
  %20 = getelementptr inbounds i8, ptr %.056, i64 5
  %21 = load i8, ptr %17, align 1, !tbaa !5
  %22 = zext i8 %21 to i32
  store volatile i32 %22, ptr %5, align 4, !tbaa !8
  %23 = getelementptr inbounds i8, ptr %.056, i64 6
  %24 = load i8, ptr %20, align 1, !tbaa !5
  %25 = zext i8 %24 to i32
  store volatile i32 %25, ptr %5, align 4, !tbaa !8
  %26 = getelementptr inbounds i8, ptr %.056, i64 7
  %27 = load i8, ptr %23, align 1, !tbaa !5
  %28 = zext i8 %27 to i32
  store volatile i32 %28, ptr %5, align 4, !tbaa !8
  %29 = getelementptr inbounds i8, ptr %.056, i64 8
  %30 = load i8, ptr %26, align 1, !tbaa !5
  %31 = zext i8 %30 to i32
  store volatile i32 %31, ptr %5, align 4, !tbaa !8
  %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 %7, !llvm.loop !10

._crit_edge.loopexit.unr-lcssa:                   ; preds = %7, %.lr.ph
  %.056.unr = phi ptr [ %1, %.lr.ph ], [ %29, %7 ]
  %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
  %.056.epil = phi ptr [ %32, %.epil.preheader ], [ %.056.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i32 [ %epil.iter.next, %.epil.preheader ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %32 = getelementptr inbounds i8, ptr %.056.epil, i64 1
  %33 = load i8, ptr %.056.epil, align 1, !tbaa !5
  %34 = zext i8 %33 to i32
  store volatile i32 %34, ptr %5, align 4, !tbaa !8
  %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 !12

._crit_edge:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.epil.preheader, %3
  ret i32 %2
}

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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"int", !6, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.unroll.disable"}


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