; LLVM IR from guanzhi/GmSSL :: src (kyber)

; 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"

@zeta = external dso_local global [256 x i16], align 16

; 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 void @init_zeta() #1 {
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  store i16 1, ptr @zeta, align 16, !tbaa !5
  store i32 1, ptr %1, align 4, !tbaa !9
  br label %2

2:                                                ; preds = %19, %0
  %3 = load i32, ptr %1, align 4, !tbaa !9
  %4 = sext i32 %3 to i64
  %5 = icmp ult i64 %4, 256
  br i1 %5, label %6, label %22

6:                                                ; preds = %2
  %7 = load i32, ptr %1, align 4, !tbaa !9
  %8 = sub nsw i32 %7, 1
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds [256 x i16], ptr @zeta, i64 0, i64 %9
  %11 = load i16, ptr %10, align 2, !tbaa !5
  %12 = sext i16 %11 to i32
  %13 = mul nsw i32 %12, 17
  %14 = srem i32 %13, 3329
  %15 = trunc i32 %14 to i16
  %16 = load i32, ptr %1, align 4, !tbaa !9
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [256 x i16], ptr @zeta, i64 0, i64 %17
  store i16 %15, ptr %18, align 2, !tbaa !5
  br label %19

19:                                               ; preds = %6
  %20 = load i32, ptr %1, align 4, !tbaa !9
  %21 = add nsw i32 %20, 1
  store i32 %21, ptr %1, align 4, !tbaa !9
  br label %2, !llvm.loop !11

22:                                               ; preds = %2
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  ret void
}

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 = !{!"short", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

@zeta = external dso_local local_unnamed_addr global [256 x i16], align 16

; Function Attrs: nofree norecurse nosync nounwind memory(write, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @init_zeta() local_unnamed_addr #0 {
  store i16 1, ptr @zeta, align 16, !tbaa !5
  br label %1

1:                                                ; preds = %1, %0
  %2 = phi i32 [ 1, %0 ], [ %12, %1 ]
  %indvars.iv = phi i64 [ 1, %0 ], [ %indvars.iv.next.2, %1 ]
  %3 = mul nsw i32 %2, 17
  %4 = srem i32 %3, 3329
  %5 = trunc nsw i32 %4 to i16
  %6 = getelementptr inbounds [256 x i16], ptr @zeta, i64 0, i64 %indvars.iv
  store i16 %5, ptr %6, align 2, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %7 = mul nsw i32 %4, 17
  %8 = srem i32 %7, 3329
  %9 = trunc nsw i32 %8 to i16
  %10 = getelementptr inbounds [256 x i16], ptr @zeta, i64 0, i64 %indvars.iv.next
  store i16 %9, ptr %10, align 2, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %11 = mul nsw i32 %8, 17
  %12 = srem i32 %11, 3329
  %13 = trunc nsw i32 %12 to i16
  %14 = getelementptr inbounds [256 x i16], ptr @zeta, i64 0, i64 %indvars.iv.next.1
  store i16 %13, ptr %14, align 2, !tbaa !5
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %exitcond.not.2 = icmp eq i64 %indvars.iv.next.2, 256
  br i1 %exitcond.not.2, label %15, label %1, !llvm.loop !9

15:                                               ; preds = %1
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(write, argmem: none, inaccessiblemem: 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)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"short", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: BDCEPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass