; LLVM IR from jgaeddert/liquid-dsp :: sandbox (reverse_byte_gentab)

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

5:                                                ; preds = %24, %1
  %6 = load i32, ptr %4, align 4, !tbaa !8
  %7 = icmp ult i32 %6, 8
  br i1 %7, label %8, label %27

8:                                                ; preds = %5
  %9 = load i8, ptr %3, align 1, !tbaa !5
  %10 = zext i8 %9 to i32
  %11 = shl i32 %10, 1
  %12 = trunc i32 %11 to i8
  store i8 %12, ptr %3, align 1, !tbaa !5
  %13 = load i8, ptr %2, align 1, !tbaa !5
  %14 = zext i8 %13 to i32
  %15 = and i32 %14, 1
  %16 = load i8, ptr %3, align 1, !tbaa !5
  %17 = zext i8 %16 to i32
  %18 = or i32 %17, %15
  %19 = trunc i32 %18 to i8
  store i8 %19, ptr %3, align 1, !tbaa !5
  %20 = load i8, ptr %2, align 1, !tbaa !5
  %21 = zext i8 %20 to i32
  %22 = ashr i32 %21, 1
  %23 = trunc i32 %22 to i8
  store i8 %23, ptr %2, align 1, !tbaa !5
  br label %24

24:                                               ; preds = %8
  %25 = load i32, ptr %4, align 4, !tbaa !8
  %26 = add i32 %25, 1
  store i32 %26, ptr %4, align 4, !tbaa !8
  br label %5, !llvm.loop !10

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

; 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 = !{!"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"}


; 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 zeroext i8 @reverse_byte(i8 noundef zeroext %0) local_unnamed_addr #0 {
  %2 = tail call i8 @llvm.bitreverse.i8(i8 %0)
  ret i8 %2
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i8 @llvm.bitreverse.i8(i8) #1

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" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

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