; LLVM IR from DionysiosB/CodeForces :: 0100-0199/132A-TuringTape.ll (Z11reverseCharc)

; 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: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z11reverseCharc(i8 noundef signext %0) #0 {
  %2 = alloca i8, align 1
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i8 %0, ptr %2, align 1, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 8, ptr %3, align 4, !tbaa !8
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !8
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !8
  br label %6

6:                                                ; preds = %21, %1
  %7 = load i32, ptr %5, align 4, !tbaa !8
  %8 = icmp slt i32 %7, 8
  br i1 %8, label %10, label %9

9:                                                ; preds = %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %24

10:                                               ; preds = %6
  %11 = load i32, ptr %4, align 4, !tbaa !8
  %12 = mul nsw i32 2, %11
  %13 = load i8, ptr %2, align 1, !tbaa !5
  %14 = sext i8 %13 to i32
  %15 = srem i32 %14, 2
  %16 = add nsw i32 %12, %15
  store i32 %16, ptr %4, align 4, !tbaa !8
  %17 = load i8, ptr %2, align 1, !tbaa !5
  %18 = sext i8 %17 to i32
  %19 = sdiv i32 %18, 2
  %20 = trunc i32 %19 to i8
  store i8 %20, ptr %2, align 1, !tbaa !5
  br label %21

21:                                               ; preds = %10
  %22 = load i32, ptr %5, align 4, !tbaa !8
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %5, align 4, !tbaa !8
  br label %6, !llvm.loop !10

24:                                               ; preds = %9
  %25 = load i32, ptr %4, align 4, !tbaa !8
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %25
}

; 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 = { mustprogress 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"int", !6, 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: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i32 @_Z11reverseCharc(i8 noundef signext %0) local_unnamed_addr #0 {
  %2 = srem i8 %0, 2
  %.sext = sext i8 %2 to i32
  %3 = sdiv i8 %0, 2
  %4 = srem i8 %3, 2
  %.sext.1 = sext i8 %4 to i32
  %5 = sdiv i8 %0, 4
  %6 = shl nsw i32 %.sext, 2
  %7 = shl nsw i32 %.sext.1, 1
  %8 = add nsw i32 %6, %7
  %9 = srem i8 %5, 2
  %.sext.2 = sext i8 %9 to i32
  %10 = add nsw i32 %8, %.sext.2
  %11 = sdiv i8 %0, 8
  %12 = srem i8 %11, 2
  %.sext.3 = sext i8 %12 to i32
  %13 = sdiv i8 %0, 16
  %14 = shl nsw i32 %10, 2
  %15 = shl nsw i32 %.sext.3, 1
  %16 = add nsw i32 %14, %15
  %17 = srem i8 %13, 2
  %.sext.4 = sext i8 %17 to i32
  %18 = add nsw i32 %16, %.sext.4
  %19 = sdiv i8 %0, 32
  %20 = srem i8 %19, 2
  %.sext.5 = sext i8 %20 to i32
  %21 = sdiv i8 %0, 64
  %22 = shl i32 %18, 2
  %23 = shl nsw i32 %.sext.5, 1
  %24 = add i32 %22, %23
  %25 = srem i8 %21, 2
  %.sext.6 = sext i8 %25 to i32
  %26 = add nsw i32 %24, %.sext.6
  %27 = sdiv i8 %21, 2
  %28 = shl nsw i32 %26, 1
  %.sext.7 = sext i8 %27 to i32
  %29 = add nsw i32 %28, %.sext.7
  ret i32 %29
}

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,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LCSSAPass,LoopRotatePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass