; LLVM IR from ARM-software/Arm-2D :: examples/common/platform/mps2/stdout_USART.ll (write)

; 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 i32 @stdout_putchar(i8 noundef signext) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @_write(i32 noundef %0, ptr noundef %1, i32 noundef %2) #0 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store i32 %0, ptr %5, align 4, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !5
  %9 = load i32, ptr %5, align 4, !tbaa !5
  %10 = icmp eq i32 %9, 1
  br i1 %10, label %11, label %24

11:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %12 = load i32, ptr %7, align 4, !tbaa !5
  store i32 %12, ptr %8, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %18, %11
  %14 = load ptr, ptr %6, align 8, !tbaa !9
  %15 = getelementptr inbounds i8, ptr %14, i32 1
  store ptr %15, ptr %6, align 8, !tbaa !9
  %16 = load i8, ptr %14, align 1, !tbaa !11
  %17 = call i32 @stdout_putchar(i8 noundef signext %16)
  br label %18

18:                                               ; preds = %13
  %19 = load i32, ptr %8, align 4, !tbaa !5
  %20 = add nsw i32 %19, -1
  store i32 %20, ptr %8, align 4, !tbaa !5
  %21 = icmp ne i32 %20, 0
  br i1 %21, label %13, label %22, !llvm.loop !12

22:                                               ; preds = %18
  %23 = load i32, ptr %7, align 4, !tbaa !5
  store i32 %23, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %25

24:                                               ; preds = %3
  store i32 -1, ptr %4, align 4
  br label %25

25:                                               ; preds = %24, %22
  %26 = load i32, ptr %4, align 4
  ret i32 %26
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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: nounwind uwtable
declare dso_local i32 @stdout_putchar(i8 noundef signext) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @_write(i32 noundef %0, ptr nocapture noundef readonly %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq i32 %0, 1
  br i1 %4, label %.preheader, label %.loopexit

.preheader:                                       ; preds = %3, %.preheader
  %.06 = phi ptr [ %5, %.preheader ], [ %1, %3 ]
  %.0 = phi i32 [ %8, %.preheader ], [ %2, %3 ]
  %5 = getelementptr inbounds i8, ptr %.06, i64 1
  %6 = load i8, ptr %.06, align 1, !tbaa !5
  %7 = tail call i32 @stdout_putchar(i8 noundef signext %6)
  %8 = add nsw i32 %.0, -1
  %.not = icmp eq i32 %8, 0
  br i1 %.not, label %.loopexit, label %.preheader, !llvm.loop !8

.loopexit:                                        ; preds = %.preheader, %3
  %.05 = phi i32 [ -1, %3 ], [ %2, %.preheader ]
  ret i32 %.05
}

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: GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass