; 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"

; 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 @kyber_poly_decompress(ptr noundef %0, i32 noundef %1, ptr noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store ptr %2, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %9 = load i32, ptr %5, align 4, !tbaa !9
  %10 = shl i32 1, %9
  store i32 %10, ptr %8, align 4, !tbaa !9
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %32, %3
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = icmp slt i32 %12, 256
  br i1 %13, label %14, label %35

14:                                               ; preds = %11
  %15 = load ptr, ptr %6, align 8, !tbaa !5
  %16 = load i32, ptr %7, align 4, !tbaa !9
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds i16, ptr %15, i64 %17
  %19 = load i16, ptr %18, align 2, !tbaa !11
  %20 = sext i16 %19 to i32
  %21 = mul nsw i32 %20, 3329
  %22 = load i32, ptr %8, align 4, !tbaa !9
  %23 = sdiv i32 %22, 2
  %24 = add nsw i32 %21, %23
  %25 = load i32, ptr %8, align 4, !tbaa !9
  %26 = sdiv i32 %24, %25
  %27 = trunc i32 %26 to i16
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  %29 = load i32, ptr %7, align 4, !tbaa !9
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds i16, ptr %28, i64 %30
  store i16 %27, ptr %31, align 2, !tbaa !11
  br label %32

32:                                               ; preds = %14
  %33 = load i32, ptr %7, align 4, !tbaa !9
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %7, align 4, !tbaa !9
  br label %11, !llvm.loop !13

35:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 1
}

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 = !{!"any pointer", !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 = !{!12, !12, i64 0}
!12 = !{!"short", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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: nofree norecurse nosync nounwind memory(argmem: readwrite) uwtable
define dso_local noundef i32 @kyber_poly_decompress(ptr nocapture noundef writeonly %0, i32 noundef %1, ptr nocapture noundef readonly %2) local_unnamed_addr #0 {
  %4 = shl nuw i32 1, %1
  %5 = sdiv i32 %4, 2
  br label %6

6:                                                ; preds = %6, %3
  %indvars.iv = phi i64 [ 0, %3 ], [ %indvars.iv.next.1, %6 ]
  %7 = getelementptr inbounds i16, ptr %2, i64 %indvars.iv
  %8 = load i16, ptr %7, align 2, !tbaa !5
  %9 = sext i16 %8 to i32
  %10 = mul nsw i32 %9, 3329
  %11 = add nsw i32 %10, %5
  %12 = sdiv i32 %11, %4
  %13 = trunc i32 %12 to i16
  %14 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv
  store i16 %13, ptr %14, align 2, !tbaa !5
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %15 = getelementptr inbounds i16, ptr %2, i64 %indvars.iv.next
  %16 = load i16, ptr %15, align 2, !tbaa !5
  %17 = sext i16 %16 to i32
  %18 = mul nsw i32 %17, 3329
  %19 = add nsw i32 %18, %5
  %20 = sdiv i32 %19, %4
  %21 = trunc i32 %20 to i16
  %22 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv.next
  store i16 %21, ptr %22, align 2, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %exitcond.not.1 = icmp eq i64 %indvars.iv.next.1, 256
  br i1 %exitcond.not.1, label %23, label %6, !llvm.loop !9

23:                                               ; preds = %6
  ret i32 1
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: readwrite) 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: EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LICMPass,LoopRotatePass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass