; LLVM IR from square/subzero :: core/trezor-crypto (bignum)

; 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"

%struct.bignum256 = type { [9 x i32] }

; 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 @bn_rshift(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %4

4:                                                ; preds = %30, %1
  %5 = load i32, ptr %3, align 4, !tbaa !9
  %6 = icmp slt i32 %5, 8
  br i1 %6, label %7, label %33

7:                                                ; preds = %4
  %8 = load ptr, ptr %2, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.bignum256, ptr %8, i32 0, i32 0
  %10 = load i32, ptr %3, align 4, !tbaa !9
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds [9 x i32], ptr %9, i64 0, i64 %11
  %13 = load i32, ptr %12, align 4, !tbaa !9
  %14 = lshr i32 %13, 1
  %15 = load ptr, ptr %2, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.bignum256, ptr %15, i32 0, i32 0
  %17 = load i32, ptr %3, align 4, !tbaa !9
  %18 = add nsw i32 %17, 1
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [9 x i32], ptr %16, i64 0, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !9
  %22 = and i32 %21, 1
  %23 = shl i32 %22, 29
  %24 = or i32 %14, %23
  %25 = load ptr, ptr %2, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.bignum256, ptr %25, i32 0, i32 0
  %27 = load i32, ptr %3, align 4, !tbaa !9
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds [9 x i32], ptr %26, i64 0, i64 %28
  store i32 %24, ptr %29, align 4, !tbaa !9
  br label %30

30:                                               ; preds = %7
  %31 = load i32, ptr %3, align 4, !tbaa !9
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %3, align 4, !tbaa !9
  br label %4, !llvm.loop !11

33:                                               ; preds = %4
  %34 = load ptr, ptr %2, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.bignum256, ptr %34, i32 0, i32 0
  %36 = getelementptr inbounds [9 x i32], ptr %35, i64 0, i64 8
  %37 = load i32, ptr %36, align 4, !tbaa !9
  %38 = lshr i32 %37, 1
  store i32 %38, ptr %36, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #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 = !{!"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 = 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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: readwrite) uwtable
define dso_local void @bn_rshift(ptr nocapture noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr %0, align 4, !tbaa !5
  %3 = getelementptr inbounds i8, ptr %0, i64 4
  %4 = getelementptr inbounds i8, ptr %0, i64 16
  %5 = load <4 x i32>, ptr %3, align 4, !tbaa !5
  %6 = insertelement <4 x i32> poison, i32 %2, i64 0
  %7 = shufflevector <4 x i32> %6, <4 x i32> %5, <4 x i32> <i32 0, i32 4, i32 5, i32 6>
  %8 = lshr <4 x i32> %7, <i32 1, i32 1, i32 1, i32 1>
  %9 = shl <4 x i32> %5, <i32 29, i32 29, i32 29, i32 29>
  %10 = and <4 x i32> %9, <i32 536870912, i32 536870912, i32 536870912, i32 536870912>
  %11 = or <4 x i32> %10, %8
  store <4 x i32> %11, ptr %0, align 4, !tbaa !5
  %12 = getelementptr inbounds i8, ptr %0, i64 20
  %13 = getelementptr inbounds i8, ptr %0, i64 32
  %14 = load <4 x i32>, ptr %12, align 4, !tbaa !5
  %15 = shufflevector <4 x i32> %5, <4 x i32> %14, <4 x i32> <i32 3, i32 4, i32 5, i32 6>
  %16 = lshr <4 x i32> %15, <i32 1, i32 1, i32 1, i32 1>
  %17 = shl <4 x i32> %14, <i32 29, i32 29, i32 29, i32 29>
  %18 = and <4 x i32> %17, <i32 536870912, i32 536870912, i32 536870912, i32 536870912>
  %19 = or <4 x i32> %18, %16
  store <4 x i32> %19, ptr %4, align 4, !tbaa !5
  %20 = extractelement <4 x i32> %14, i64 3
  %21 = lshr i32 %20, 1
  store i32 %21, ptr %13, align 4, !tbaa !5
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


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