; LLVM IR from Serpent27/Wyndhim :: src (main)

; 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 zeroext i8 @hex_to_int(i8 noundef zeroext %0) #1 {
  %2 = alloca i8, align 1
  %3 = alloca i8, align 1
  %4 = alloca i8, align 1
  %5 = alloca i8, align 1
  store i8 %0, ptr %2, align 1, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr %3) #2
  %6 = load i8, ptr %2, align 1, !tbaa !5
  %7 = zext i8 %6 to i32
  %8 = sdiv i32 %7, 16
  %9 = sub nsw i32 %8, 3
  %10 = trunc i32 %9 to i8
  store i8 %10, ptr %3, align 1, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr %4) #2
  %11 = load i8, ptr %2, align 1, !tbaa !5
  %12 = zext i8 %11 to i32
  %13 = srem i32 %12, 16
  %14 = trunc i32 %13 to i8
  store i8 %14, ptr %4, align 1, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr %5) #2
  %15 = load i8, ptr %3, align 1, !tbaa !5
  %16 = zext i8 %15 to i32
  %17 = mul nsw i32 %16, 10
  %18 = load i8, ptr %4, align 1, !tbaa !5
  %19 = zext i8 %18 to i32
  %20 = add nsw i32 %17, %19
  %21 = trunc i32 %20 to i8
  store i8 %21, ptr %5, align 1, !tbaa !5
  %22 = load i8, ptr %5, align 1, !tbaa !5
  %23 = zext i8 %22 to i32
  %24 = icmp sgt i32 %23, 9
  br i1 %24, label %25, label %28

25:                                               ; preds = %1
  %26 = load i8, ptr %5, align 1, !tbaa !5
  %27 = add i8 %26, -1
  store i8 %27, ptr %5, align 1, !tbaa !5
  br label %28

28:                                               ; preds = %25, %1
  %29 = load i8, ptr %5, align 1, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 1, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 1, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 1, ptr %3) #2
  ret i8 %29
}

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 zeroext i8 @hex_to_int(i8 noundef zeroext %0) local_unnamed_addr #0 {
  %2 = lshr i8 %0, 4
  %3 = and i8 %0, 15
  %4 = mul nuw i8 %2, 10
  %5 = add nuw nsw i8 %3, -30
  %6 = add i8 %5, %4
  %7 = icmp ugt i8 %6, 9
  %8 = sext i1 %7 to i8
  %spec.select = add i8 %6, %8
  ret i8 %spec.select
}

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: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass