; 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_lshift(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 8, ptr %3, align 4, !tbaa !9
  br label %4

4:                                                ; preds = %31, %1
  %5 = load i32, ptr %3, align 4, !tbaa !9
  %6 = icmp sgt i32 %5, 0
  br i1 %6, label %7, label %34

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 = shl i32 %13, 1
  %15 = and i32 %14, 1073741823
  %16 = load ptr, ptr %2, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.bignum256, ptr %16, i32 0, i32 0
  %18 = load i32, ptr %3, align 4, !tbaa !9
  %19 = sub nsw i32 %18, 1
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [9 x i32], ptr %17, i64 0, i64 %20
  %22 = load i32, ptr %21, align 4, !tbaa !9
  %23 = and i32 %22, 536870912
  %24 = lshr i32 %23, 29
  %25 = or i32 %15, %24
  %26 = load ptr, ptr %2, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.bignum256, ptr %26, i32 0, i32 0
  %28 = load i32, ptr %3, align 4, !tbaa !9
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [9 x i32], ptr %27, i64 0, i64 %29
  store i32 %25, ptr %30, align 4, !tbaa !9
  br label %31

31:                                               ; preds = %7
  %32 = load i32, ptr %3, align 4, !tbaa !9
  %33 = add nsw i32 %32, -1
  store i32 %33, ptr %3, align 4, !tbaa !9
  br label %4, !llvm.loop !11

34:                                               ; preds = %4
  %35 = load ptr, ptr %2, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.bignum256, ptr %35, i32 0, i32 0
  %37 = getelementptr inbounds [9 x i32], ptr %36, i64 0, i64 0
  %38 = load i32, ptr %37, align 4, !tbaa !9
  %39 = shl i32 %38, 1
  %40 = and i32 %39, 1073741823
  %41 = load ptr, ptr %2, align 8, !tbaa !5
  %42 = getelementptr inbounds %struct.bignum256, ptr %41, i32 0, i32 0
  %43 = getelementptr inbounds [9 x i32], ptr %42, i64 0, i64 0
  store i32 %40, ptr %43, 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_lshift(ptr nocapture noundef %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 32
  %3 = load i32, ptr %2, align 4, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %0, i64 20
  %5 = getelementptr inbounds i8, ptr %0, i64 16
  %6 = load <4 x i32>, ptr %5, align 4, !tbaa !5
  %7 = shufflevector <4 x i32> %6, <4 x i32> poison, <4 x i32> <i32 1, i32 2, i32 3, i32 poison>
  %8 = insertelement <4 x i32> %7, i32 %3, i64 3
  %9 = shl <4 x i32> %8, <i32 1, i32 1, i32 1, i32 1>
  %10 = and <4 x i32> %9, <i32 1073741822, i32 1073741822, i32 1073741822, i32 1073741822>
  %11 = lshr <4 x i32> %6, <i32 29, i32 29, i32 29, i32 29>
  %12 = and <4 x i32> %11, <i32 1, i32 1, i32 1, i32 1>
  %13 = or disjoint <4 x i32> %12, %10
  store <4 x i32> %13, ptr %4, align 4, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %0, i64 4
  %15 = load <4 x i32>, ptr %0, align 4, !tbaa !5
  %16 = shufflevector <4 x i32> %15, <4 x i32> poison, <4 x i32> <i32 1, i32 2, i32 3, i32 poison>
  %17 = shufflevector <4 x i32> %16, <4 x i32> %6, <4 x i32> <i32 0, i32 1, i32 2, i32 4>
  %18 = shl <4 x i32> %17, <i32 1, i32 1, i32 1, i32 1>
  %19 = and <4 x i32> %18, <i32 1073741822, i32 1073741822, i32 1073741822, i32 1073741822>
  %20 = lshr <4 x i32> %15, <i32 29, i32 29, i32 29, i32 29>
  %21 = and <4 x i32> %20, <i32 1, i32 1, i32 1, i32 1>
  %22 = or disjoint <4 x i32> %21, %19
  store <4 x i32> %22, ptr %14, align 4, !tbaa !5
  %23 = extractelement <4 x i32> %15, i64 0
  %24 = shl i32 %23, 1
  %25 = and i32 %24, 1073741822
  store i32 %25, ptr %0, 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