; LLVM IR from sca-secure-library-sca25519/sca25519 :: STM32F407-ephemeral/crypto/numerics (fe25519)

; 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
declare dso_local void @fe25519_reduceCompletely(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @fe25519_iszero(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i8, align 1
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr %3) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  call void @fe25519_reduceCompletely(ptr noundef %6)
  store i32 0, ptr %4, align 4, !tbaa !9
  store i8 1, ptr %3, align 1, !tbaa !11
  br label %7

7:                                                ; preds = %19, %1
  %8 = load i8, ptr %3, align 1, !tbaa !11
  %9 = zext i8 %8 to i32
  %10 = icmp slt i32 %9, 8
  br i1 %10, label %11, label %22

11:                                               ; preds = %7
  %12 = load ptr, ptr %2, align 8, !tbaa !5
  %13 = load i8, ptr %3, align 1, !tbaa !11
  %14 = zext i8 %13 to i64
  %15 = getelementptr inbounds [8 x i32], ptr %12, i64 0, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !11
  %17 = load i32, ptr %4, align 4, !tbaa !9
  %18 = or i32 %17, %16
  store i32 %18, ptr %4, align 4, !tbaa !9
  br label %19

19:                                               ; preds = %11
  %20 = load i8, ptr %3, align 1, !tbaa !11
  %21 = add i8 %20, 1
  store i8 %21, ptr %3, align 1, !tbaa !11
  br label %7, !llvm.loop !12

22:                                               ; preds = %7
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 -1, ptr %5, align 4, !tbaa !9
  %23 = load i32, ptr %4, align 4, !tbaa !9
  %24 = xor i32 %23, -1
  %25 = load i32, ptr %5, align 4, !tbaa !9
  %26 = xor i32 %25, %24
  store i32 %26, ptr %5, align 4, !tbaa !9
  %27 = load i32, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 1, ptr %3) #2
  ret i32 %27
}

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 = !{!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: nounwind uwtable
declare dso_local void @fe25519_reduceCompletely(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local i32 @fe25519_iszero(ptr noundef %0) local_unnamed_addr #0 {
  tail call void @fe25519_reduceCompletely(ptr noundef %0)
  %2 = getelementptr inbounds i8, ptr %0, i64 4
  %3 = load <4 x i32>, ptr %2, align 4, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %0, i64 20
  %5 = load i32, ptr %4, align 4, !tbaa !5
  %6 = getelementptr inbounds i8, ptr %0, i64 24
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %0, i64 28
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = tail call i32 @llvm.vector.reduce.or.v4i32(<4 x i32> %3)
  %op.rdx = or i32 %10, %5
  %op.rdx12 = or i32 %7, %9
  %op.rdx13 = or i32 %op.rdx, %op.rdx12
  ret i32 %op.rdx13
}

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


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