; LLVM IR from sca-secure-library-sca25519/sca25519 :: STM32F407-ephemeral/crypto/numerics (sc25519)

; 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"

%union.UN_256bitValue_ = type { [4 x %union.UN_64bitValue_] }
%union.UN_64bitValue_ = type { [1 x i64] }

@sc25519_scalar = external hidden constant { [36 x i8], [4 x i8] }, align 8

; 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

declare void @cpy_256bitvalue(ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
declare hidden i32 @bigint_add(ptr noundef, ptr noundef, i32 noundef) #2

; Function Attrs: nounwind uwtable
define dso_local void @sc25519_sub(ptr noundef %0, ptr noundef %1, ptr noundef %2) #2 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca %union.UN_256bitValue_, align 8
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store ptr %2, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 32, ptr %7) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  call void @cpy_256bitvalue(ptr noundef %10, ptr noundef %11)
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = getelementptr inbounds [8 x i32], ptr %12, i64 0, i64 0
  %14 = load ptr, ptr %6, align 8, !tbaa !5
  %15 = getelementptr inbounds [8 x i32], ptr %14, i64 0, i64 0
  %16 = call i32 @bigint_sub(ptr noundef %13, ptr noundef %15, i32 noundef 8)
  store i32 %16, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  store i32 0, ptr %9, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %28, %3
  %18 = load i32, ptr %9, align 4, !tbaa !9
  %19 = icmp slt i32 %18, 8
  br i1 %19, label %20, label %31

20:                                               ; preds = %17
  %21 = load i32, ptr %9, align 4, !tbaa !9
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [9 x i32], ptr @sc25519_scalar, i64 0, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !11
  %25 = load i32, ptr %9, align 4, !tbaa !9
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [8 x i32], ptr %7, i64 0, i64 %26
  store i32 %24, ptr %27, align 4, !tbaa !11
  br label %28

28:                                               ; preds = %20
  %29 = load i32, ptr %9, align 4, !tbaa !9
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %9, align 4, !tbaa !9
  br label %17, !llvm.loop !12

31:                                               ; preds = %17
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  %32 = getelementptr inbounds [8 x i32], ptr %7, i64 0, i64 0
  %33 = load ptr, ptr %4, align 8, !tbaa !5
  %34 = getelementptr inbounds [8 x i32], ptr %33, i64 0, i64 0
  %35 = call i32 @bigint_add(ptr noundef %32, ptr noundef %34, i32 noundef 8)
  %36 = load ptr, ptr %4, align 8, !tbaa !5
  %37 = load i32, ptr %8, align 4, !tbaa !9
  %38 = and i32 %37, 1
  %39 = trunc i32 %38 to i8
  call void @conditionalMove_256bitValue(ptr noundef %36, ptr noundef %7, i8 noundef zeroext %39)
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 32, ptr %7) #3
  ret void
}

; Function Attrs: nounwind uwtable
declare hidden i32 @bigint_sub(ptr noundef, ptr noundef, i32 noundef) #2

declare void @conditionalMove_256bitValue(ptr noundef, ptr noundef, i8 noundef zeroext) #1

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { 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 #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 = !{!"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 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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"

%union.UN_256bitValue_ = type { [4 x %union.UN_64bitValue_] }
%union.UN_64bitValue_ = type { [1 x i64] }

@sc25519_scalar = external hidden local_unnamed_addr constant { [36 x i8], [4 x i8] }, align 8

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

declare void @cpy_256bitvalue(ptr noundef, ptr noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
declare hidden i32 @bigint_add(ptr noundef, ptr noundef, i32 noundef) local_unnamed_addr #2

; Function Attrs: nounwind uwtable
define dso_local void @sc25519_sub(ptr noundef %0, ptr noundef %1, ptr noundef %2) local_unnamed_addr #2 {
  %4 = alloca %union.UN_256bitValue_, align 8
  call void @llvm.lifetime.start.p0(i64 32, ptr nonnull %4) #4
  tail call void @cpy_256bitvalue(ptr noundef %0, ptr noundef %1) #4
  %5 = tail call i32 @bigint_sub(ptr noundef %0, ptr noundef %2, i32 noundef 8)
  call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 8 dereferenceable(32) %4, ptr noundef nonnull align 8 dereferenceable(32) @sc25519_scalar, i64 32, i1 false), !tbaa !5
  %6 = call i32 @bigint_add(ptr noundef nonnull %4, ptr noundef %0, i32 noundef 8)
  %7 = trunc i32 %5 to i8
  %8 = and i8 %7, 1
  call void @conditionalMove_256bitValue(ptr noundef %0, ptr noundef nonnull %4, i8 noundef zeroext %8) #4
  call void @llvm.lifetime.end.p0(i64 32, ptr nonnull %4) #4
  ret void
}

; Function Attrs: nounwind uwtable
declare hidden i32 @bigint_sub(ptr noundef, ptr noundef, i32 noundef) local_unnamed_addr #2

declare void @conditionalMove_256bitValue(ptr noundef, ptr noundef, i8 noundef zeroext) local_unnamed_addr #1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #3

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { 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 #3 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopIdiomRecognizePass,LoopRotatePass,SROAPass,SimplifyCFGPass,TailCallElimPass