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

; 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"

@.str = external hidden unnamed_addr constant [74 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [51 x i8], align 1

; 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 @liquid_nextpow2(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %5 = load i32, ptr %3, align 4, !tbaa !5
  %6 = icmp eq i32 %5, 0
  br i1 %6, label %7, label %9

7:                                                ; preds = %1
  %8 = call i32 (i32, ptr, i32, ptr, ...) @liquid_error_fl(i32 noundef 3, ptr noundef @.str, i32 noundef 138, ptr noundef @.str.1)
  store i32 0, ptr %2, align 4
  br label %22

9:                                                ; preds = %1
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = add i32 %10, -1
  store i32 %11, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %12

12:                                               ; preds = %15, %9
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = icmp ugt i32 %13, 0
  br i1 %14, label %15, label %20

15:                                               ; preds = %12
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = lshr i32 %16, 1
  store i32 %17, ptr %3, align 4, !tbaa !5
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = add i32 %18, 1
  store i32 %19, ptr %4, align 4, !tbaa !5
  br label %12, !llvm.loop !9

20:                                               ; preds = %12
  %21 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %21, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %22

22:                                               ; preds = %20, %7
  %23 = load i32, ptr %2, align 4
  ret i32 %23
}

declare i32 @liquid_error_fl(i32 noundef, ptr noundef, i32 noundef, ptr noundef, ...) #2

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 = { "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 #3 = { 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"

@.str = external hidden unnamed_addr constant [74 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [51 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local i32 @liquid_nextpow2(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp eq i32 %0, 0
  br i1 %2, label %3, label %5

3:                                                ; preds = %1
  %4 = tail call i32 (i32, ptr, i32, ptr, ...) @liquid_error_fl(i32 noundef 3, ptr noundef nonnull @.str, i32 noundef 138, ptr noundef nonnull @.str.1) #3
  br label %.loopexit

5:                                                ; preds = %1
  %6 = add i32 %0, -1
  %.not10 = icmp eq i32 %6, 0
  br i1 %.not10, label %.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %5
  %7 = tail call range(i32 0, 33) i32 @llvm.ctlz.i32(i32 %6, i1 true)
  %8 = sub nuw nsw i32 32, %7
  br label %.loopexit

.loopexit:                                        ; preds = %.lr.ph.preheader, %5, %3
  %.08 = phi i32 [ 0, %3 ], [ 0, %5 ], [ %8, %.lr.ph.preheader ]
  ret i32 %.08
}

declare i32 @liquid_error_fl(i32 noundef, ptr noundef, i32 noundef, ptr noundef, ...) local_unnamed_addr #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.ctlz.i32(i32, i1 immarg) #2

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 = { "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 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #3 = { 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)"}


; Effective O3 passes: GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LCSSAPass,LoopIdiomRecognizePass,LoopRotatePass,LoopSimplifyPass,SCCPPass,SROAPass,SimplifyCFGPass,TailCallElimPass