; LLVM IR from jgaeddert/liquid-dsp :: src/modem/src (modem_utilities)

; 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 i32 @gray_decode(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  %6 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %6, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %7 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %7, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %30, %1
  %9 = load i32, ptr %5, align 4, !tbaa !5
  %10 = icmp ult i32 %9, 8
  br i1 %10, label %11, label %33

11:                                               ; preds = %8
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = lshr i32 %12, 1
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = xor i32 %14, %13
  store i32 %15, ptr %4, align 4, !tbaa !5
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = lshr i32 %16, 2
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = xor i32 %18, %17
  store i32 %19, ptr %4, align 4, !tbaa !5
  %20 = load i32, ptr %3, align 4, !tbaa !5
  %21 = lshr i32 %20, 3
  %22 = load i32, ptr %4, align 4, !tbaa !5
  %23 = xor i32 %22, %21
  store i32 %23, ptr %4, align 4, !tbaa !5
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = lshr i32 %24, 4
  %26 = load i32, ptr %4, align 4, !tbaa !5
  %27 = xor i32 %26, %25
  store i32 %27, ptr %4, align 4, !tbaa !5
  %28 = load i32, ptr %3, align 4, !tbaa !5
  %29 = lshr i32 %28, 4
  store i32 %29, ptr %3, align 4, !tbaa !5
  br label %30

30:                                               ; preds = %11
  %31 = load i32, ptr %5, align 4, !tbaa !5
  %32 = add i32 %31, 4
  store i32 %32, ptr %5, align 4, !tbaa !5
  br label %8, !llvm.loop !9

33:                                               ; preds = %8
  %34 = load i32, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %34
}

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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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 i32 @gray_decode(i32 noundef %0) local_unnamed_addr #0 {
  %2 = lshr i32 %0, 1
  %3 = lshr i32 %0, 2
  %4 = xor i32 %2, %3
  %5 = lshr i32 %0, 3
  %6 = xor i32 %4, %5
  %7 = lshr i32 %0, 4
  %8 = xor i32 %6, %7
  %9 = xor i32 %8, %0
  %10 = lshr i32 %0, 5
  %11 = lshr i32 %0, 6
  %12 = xor i32 %10, %11
  %13 = lshr i32 %0, 7
  %14 = xor i32 %12, %13
  %15 = xor i32 %14, %9
  %16 = lshr i32 %0, 8
  %17 = xor i32 %15, %16
  ret i32 %17
}

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