; LLVM IR from trustwallet/wallet-core :: trezor-crypto/crypto/ed25519-donna (ed25519-donna-impl-base)

; 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: nounwind uwtable
define dso_local i32 @ed25519_verify(ptr noundef %0, ptr noundef %1, i64 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i64 %2, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  store i64 0, ptr %7, align 8, !tbaa !9
  br label %8

8:                                                ; preds = %12, %3
  %9 = load i64, ptr %6, align 8, !tbaa !9
  %10 = add i64 %9, -1
  store i64 %10, ptr %6, align 8, !tbaa !9
  %11 = icmp ne i64 %9, 0
  br i1 %11, label %12, label %25

12:                                               ; preds = %8
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %13, i32 1
  store ptr %14, ptr %4, align 8, !tbaa !5
  %15 = load i8, ptr %13, align 1, !tbaa !11
  %16 = zext i8 %15 to i32
  %17 = load ptr, ptr %5, align 8, !tbaa !5
  %18 = getelementptr inbounds i8, ptr %17, i32 1
  store ptr %18, ptr %5, align 8, !tbaa !5
  %19 = load i8, ptr %17, align 1, !tbaa !11
  %20 = zext i8 %19 to i32
  %21 = xor i32 %16, %20
  %22 = sext i32 %21 to i64
  %23 = load i64, ptr %7, align 8, !tbaa !9
  %24 = or i64 %23, %22
  store i64 %24, ptr %7, align 8, !tbaa !9
  br label %8, !llvm.loop !12

25:                                               ; preds = %8
  %26 = load i64, ptr %7, align 8, !tbaa !9
  %27 = sub i64 %26, 1
  %28 = lshr i64 %27, 8
  %29 = and i64 1, %28
  %30 = trunc i64 %29 to i32
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  ret i32 %30
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { 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 #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!"long", !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"

; Function Attrs: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local range(i32 0, 2) i32 @ed25519_verify(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i64 noundef %2) local_unnamed_addr #0 {
  %.not7 = icmp eq i64 %2, 0
  br i1 %.not7, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %min.iters.check = icmp ult i64 %2, 8
  br i1 %min.iters.check, label %.lr.ph.preheader23, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %2, -8
  %ind.end = and i64 %2, 7
  %ind.end12 = getelementptr i8, ptr %1, i64 %n.vec
  %ind.end14 = getelementptr i8, ptr %0, i64 %n.vec
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %10, %vector.body ]
  %vec.phi16 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %11, %vector.body ]
  %next.gep = getelementptr i8, ptr %1, i64 %index
  %next.gep18 = getelementptr i8, ptr %0, i64 %index
  %4 = getelementptr i8, ptr %next.gep18, i64 4
  %wide.load = load <4 x i8>, ptr %next.gep18, align 1, !tbaa !5
  %wide.load20 = load <4 x i8>, ptr %4, align 1, !tbaa !5
  %5 = getelementptr i8, ptr %next.gep, i64 4
  %wide.load21 = load <4 x i8>, ptr %next.gep, align 1, !tbaa !5
  %wide.load22 = load <4 x i8>, ptr %5, align 1, !tbaa !5
  %6 = xor <4 x i8> %wide.load21, %wide.load
  %7 = xor <4 x i8> %wide.load22, %wide.load20
  %8 = zext <4 x i8> %6 to <4 x i32>
  %9 = zext <4 x i8> %7 to <4 x i32>
  %10 = or <4 x i32> %vec.phi, %8
  %11 = or <4 x i32> %vec.phi16, %9
  %index.next = add nuw i64 %index, 8
  %12 = icmp eq i64 %index.next, %n.vec
  br i1 %12, label %middle.block, label %vector.body, !llvm.loop !8

middle.block:                                     ; preds = %vector.body
  %bin.rdx = or <4 x i32> %11, %10
  %13 = tail call i32 @llvm.vector.reduce.or.v4i32(<4 x i32> %bin.rdx)
  %cmp.n = icmp eq i64 %n.vec, %2
  br i1 %cmp.n, label %._crit_edge.loopexit, label %.lr.ph.preheader23

.lr.ph.preheader23:                               ; preds = %middle.block, %.lr.ph.preheader
  %.011.ph = phi i32 [ 0, %.lr.ph.preheader ], [ %13, %middle.block ]
  %.0410.ph = phi i64 [ %2, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.059.ph = phi ptr [ %1, %.lr.ph.preheader ], [ %ind.end12, %middle.block ]
  %.068.ph = phi ptr [ %0, %.lr.ph.preheader ], [ %ind.end14, %middle.block ]
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader23, %.lr.ph
  %.011 = phi i32 [ %21, %.lr.ph ], [ %.011.ph, %.lr.ph.preheader23 ]
  %.0410 = phi i64 [ %14, %.lr.ph ], [ %.0410.ph, %.lr.ph.preheader23 ]
  %.059 = phi ptr [ %17, %.lr.ph ], [ %.059.ph, %.lr.ph.preheader23 ]
  %.068 = phi ptr [ %15, %.lr.ph ], [ %.068.ph, %.lr.ph.preheader23 ]
  %14 = add i64 %.0410, -1
  %15 = getelementptr inbounds i8, ptr %.068, i64 1
  %16 = load i8, ptr %.068, align 1, !tbaa !5
  %17 = getelementptr inbounds i8, ptr %.059, i64 1
  %18 = load i8, ptr %.059, align 1, !tbaa !5
  %19 = xor i8 %18, %16
  %20 = zext i8 %19 to i32
  %21 = or i32 %.011, %20
  %.not = icmp eq i64 %14, 0
  br i1 %.not, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !12

._crit_edge.loopexit:                             ; preds = %.lr.ph, %middle.block
  %.lcssa = phi i32 [ %13, %middle.block ], [ %21, %.lr.ph ]
  %22 = add nuw nsw i32 %.lcssa, 511
  %23 = lshr i32 %22, 8
  %24 = and i32 %23, 1
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %3
  %.0.lcssa = phi i32 [ 1, %3 ], [ %24, %._crit_edge.loopexit ]
  ret i32 %.0.lcssa
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.vector.reduce.or.v4i32(<4 x i32>) #1

attributes #0 = { nofree norecurse nosync nounwind memory(read, 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" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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"}
!8 = distinct !{!8, !9, !10, !11}
!9 = !{!"llvm.loop.mustprogress"}
!10 = !{!"llvm.loop.isvectorized", i32 1}
!11 = !{!"llvm.loop.unroll.runtime.disable"}
!12 = distinct !{!12, !9, !11, !10}


; Effective O3 passes: AggressiveInstCombinePass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,ReassociatePass,SCCPPass,SROAPass,SimplifyCFGPass,TailCallElimPass