; LLVM IR from HANDS-FREE/OpenRE :: 3_OS/STM32F1/RTOS/uCOS-III2/uC-LIB (lib_ascii)

; 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 signext i8 @ASCII_ToLower(i8 noundef signext %0) #1 {
  %2 = alloca i8, align 1
  %3 = alloca i8, align 1
  store i8 %0, ptr %2, align 1, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr %3) #2
  %4 = load i8, ptr %2, align 1, !tbaa !5
  %5 = sext i8 %4 to i32
  %6 = icmp sge i32 %5, 65
  br i1 %6, label %7, label %11

7:                                                ; preds = %1
  %8 = load i8, ptr %2, align 1, !tbaa !5
  %9 = sext i8 %8 to i32
  %10 = icmp sle i32 %9, 90
  br label %11

11:                                               ; preds = %7, %1
  %12 = phi i1 [ false, %1 ], [ %10, %7 ]
  %13 = zext i1 %12 to i64
  %14 = select i1 %12, i32 1, i32 0
  %15 = icmp eq i32 %14, 1
  br i1 %15, label %16, label %20

16:                                               ; preds = %11
  %17 = load i8, ptr %2, align 1, !tbaa !5
  %18 = sext i8 %17 to i32
  %19 = add nsw i32 %18, 32
  br label %23

20:                                               ; preds = %11
  %21 = load i8, ptr %2, align 1, !tbaa !5
  %22 = sext i8 %21 to i32
  br label %23

23:                                               ; preds = %20, %16
  %24 = phi i32 [ %19, %16 ], [ %22, %20 ]
  %25 = trunc i32 %24 to i8
  store i8 %25, ptr %3, align 1, !tbaa !5
  %26 = load i8, ptr %3, align 1, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 1, ptr %3) #2
  ret i8 %26
}

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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}


; 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: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local signext i8 @ASCII_ToLower(i8 noundef signext %0) local_unnamed_addr #0 {
  %2 = add i8 %0, -65
  %3 = icmp ult i8 %2, 26
  %4 = add nuw nsw i8 %0, 32
  %5 = select i1 %3, i8 %4, i8 %0
  ret i8 %5
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(none) 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)"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass