; LLVM IR from devicehive/esp8266-firmware :: firmware-src/sources (irom)

; 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 @irom_byte(ptr noundef) #0

; 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

; Function Attrs: nounwind uwtable
define dso_local void @irom_read(ptr noundef %0, i32 noundef %1, ptr noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store ptr %2, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %9 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %9, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %10, ptr %8, align 8, !tbaa !5
  br label %11

11:                                               ; preds = %46, %3
  %12 = load i32, ptr %5, align 4, !tbaa !9
  %13 = icmp ugt i32 %12, 0
  br i1 %13, label %14, label %47

14:                                               ; preds = %11
  %15 = load ptr, ptr %7, align 8, !tbaa !5
  %16 = ptrtoint ptr %15 to i32
  %17 = zext i32 %16 to i64
  %18 = and i64 %17, 3
  %19 = icmp ne i64 %18, 0
  br i1 %19, label %24, label %20

20:                                               ; preds = %14
  %21 = load i32, ptr %5, align 4, !tbaa !9
  %22 = zext i32 %21 to i64
  %23 = icmp ult i64 %22, 4
  br i1 %23, label %24, label %34

24:                                               ; preds = %20, %14
  %25 = load ptr, ptr %7, align 8, !tbaa !5
  %26 = call zeroext i8 @irom_byte(ptr noundef %25)
  %27 = load ptr, ptr %8, align 8, !tbaa !5
  store i8 %26, ptr %27, align 1, !tbaa !11
  %28 = load i32, ptr %5, align 4, !tbaa !9
  %29 = sub i32 %28, 1
  store i32 %29, ptr %5, align 4, !tbaa !9
  %30 = load ptr, ptr %8, align 8, !tbaa !5
  %31 = getelementptr inbounds i8, ptr %30, i64 1
  store ptr %31, ptr %8, align 8, !tbaa !5
  %32 = load ptr, ptr %7, align 8, !tbaa !5
  %33 = getelementptr inbounds i8, ptr %32, i64 1
  store ptr %33, ptr %7, align 8, !tbaa !5
  br label %46

34:                                               ; preds = %20
  %35 = load ptr, ptr %7, align 8, !tbaa !5
  %36 = load i32, ptr %35, align 4, !tbaa !9
  %37 = load ptr, ptr %8, align 8, !tbaa !5
  store i32 %36, ptr %37, align 4, !tbaa !9
  %38 = load i32, ptr %5, align 4, !tbaa !9
  %39 = zext i32 %38 to i64
  %40 = sub i64 %39, 4
  %41 = trunc i64 %40 to i32
  store i32 %41, ptr %5, align 4, !tbaa !9
  %42 = load ptr, ptr %8, align 8, !tbaa !5
  %43 = getelementptr inbounds i8, ptr %42, i64 4
  store ptr %43, ptr %8, align 8, !tbaa !5
  %44 = load ptr, ptr %7, align 8, !tbaa !5
  %45 = getelementptr inbounds i8, ptr %44, i64 4
  store ptr %45, ptr %7, align 8, !tbaa !5
  br label %46

46:                                               ; preds = %34, %24
  br label %11, !llvm.loop !12

47:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  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" }
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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !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 zeroext i8 @irom_byte(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @irom_read(ptr nocapture noundef writeonly %0, i32 noundef %1, ptr noundef %2) local_unnamed_addr #0 {
  %.not21 = icmp eq i32 %1, 0
  br i1 %.not21, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3, %12
  %.024 = phi ptr [ %14, %12 ], [ %0, %3 ]
  %.01623 = phi ptr [ %15, %12 ], [ %2, %3 ]
  %.01822 = phi i32 [ %13, %12 ], [ %1, %3 ]
  %4 = ptrtoint ptr %.01623 to i64
  %5 = and i64 %4, 3
  %6 = icmp ne i64 %5, 0
  %7 = icmp ult i32 %.01822, 4
  %or.cond = or i1 %7, %6
  br i1 %or.cond, label %8, label %10

8:                                                ; preds = %.lr.ph
  %9 = tail call zeroext i8 @irom_byte(ptr noundef %.01623)
  store i8 %9, ptr %.024, align 1, !tbaa !5
  br label %12

10:                                               ; preds = %.lr.ph
  %11 = load i32, ptr %.01623, align 4, !tbaa !8
  store i32 %11, ptr %.024, align 4, !tbaa !8
  br label %12

12:                                               ; preds = %10, %8
  %.sink26 = phi i32 [ -4, %10 ], [ -1, %8 ]
  %.sink25 = phi i64 [ 4, %10 ], [ 1, %8 ]
  %13 = add i32 %.01822, %.sink26
  %14 = getelementptr inbounds i8, ptr %.024, i64 %.sink25
  %15 = getelementptr inbounds i8, ptr %.01623, i64 %.sink25
  %.not = icmp eq i32 %13, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !10

._crit_edge:                                      ; preds = %12, %3
  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 = !{!9, !9, i64 0}
!9 = !{!"int", !6, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass