; LLVM IR from smwikipedia/EmbeddedAndRTOSSamples :: C2.6 (uart)

; 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
declare dso_local zeroext i8 @ugetc(ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local void @uputc(ptr noundef, i8 noundef zeroext) #0

; Function Attrs: nounwind uwtable
define dso_local void @ugets(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  br label %5

5:                                                ; preds = %11, %2
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = call zeroext i8 @ugetc(ptr noundef %6)
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  store i8 %7, ptr %8, align 1, !tbaa !9
  %9 = sext i8 %7 to i32
  %10 = icmp ne i32 %9, 13
  br i1 %10, label %11, label %17

11:                                               ; preds = %5
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = load i8, ptr %13, align 1, !tbaa !9
  call void @uputc(ptr noundef %12, i8 noundef zeroext %14)
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = getelementptr inbounds i8, ptr %15, i32 1
  store ptr %16, ptr %4, align 8, !tbaa !5
  br label %5, !llvm.loop !10

17:                                               ; preds = %5
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  call void @uputc(ptr noundef %18, i8 noundef zeroext 10)
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  call void @uputc(ptr noundef %19, i8 noundef zeroext 13)
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = getelementptr inbounds i8, ptr %20, i32 1
  store ptr %21, ptr %4, align 8, !tbaa !5
  store i8 10, ptr %20, align 1, !tbaa !9
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  %23 = getelementptr inbounds i8, ptr %22, i32 1
  store ptr %23, ptr %4, align 8, !tbaa !5
  store i8 13, ptr %22, align 1, !tbaa !9
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  store i8 0, ptr %24, align 1, !tbaa !9
  ret void
}

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" }

!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 = distinct !{!10, !11}
!11 = !{!"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
declare dso_local zeroext i8 @ugetc(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @uputc(ptr noundef, i8 noundef zeroext) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @ugets(ptr noundef %0, ptr nocapture noundef writeonly %1) local_unnamed_addr #0 {
  %3 = tail call zeroext i8 @ugetc(ptr noundef %0)
  store i8 %3, ptr %1, align 1, !tbaa !5
  %.not10 = icmp eq i8 %3, 13
  br i1 %.not10, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %.lr.ph
  %4 = phi i8 [ %6, %.lr.ph ], [ %3, %2 ]
  %.011 = phi ptr [ %5, %.lr.ph ], [ %1, %2 ]
  tail call void @uputc(ptr noundef %0, i8 noundef zeroext %4)
  %5 = getelementptr inbounds i8, ptr %.011, i64 1
  %6 = tail call zeroext i8 @ugetc(ptr noundef %0)
  store i8 %6, ptr %5, align 1, !tbaa !5
  %.not = icmp eq i8 %6, 13
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !8

._crit_edge:                                      ; preds = %.lr.ph, %2
  %.0.lcssa = phi ptr [ %1, %2 ], [ %5, %.lr.ph ]
  tail call void @uputc(ptr noundef %0, i8 noundef zeroext 10)
  tail call void @uputc(ptr noundef %0, i8 noundef zeroext 13)
  %7 = getelementptr inbounds i8, ptr %.0.lcssa, i64 1
  store i8 10, ptr %.0.lcssa, align 1, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %.0.lcssa, i64 2
  store i8 13, ptr %7, align 1, !tbaa !5
  store i8 0, ptr %8, align 1, !tbaa !5
  ret void
}

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" }

!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: EarlyCSEPass,GVNPass,GlobalOptPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass