; LLVM IR from serge-sans-paille/pythran :: docs/papers/wpmvp14/experiments (euler06)

; 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 @solve(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  store i64 0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store i64 0, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store i64 0, ptr %5, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %20, %1
  %7 = load i64, ptr %5, align 8, !tbaa !5
  %8 = load i64, ptr %2, align 8, !tbaa !5
  %9 = icmp slt i64 %7, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %6
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  br label %23

11:                                               ; preds = %6
  %12 = load i64, ptr %5, align 8, !tbaa !5
  %13 = load i64, ptr %3, align 8, !tbaa !5
  %14 = add nsw i64 %13, %12
  store i64 %14, ptr %3, align 8, !tbaa !5
  %15 = load i64, ptr %5, align 8, !tbaa !5
  %16 = load i64, ptr %5, align 8, !tbaa !5
  %17 = mul nsw i64 %15, %16
  %18 = load i64, ptr %4, align 8, !tbaa !5
  %19 = add nsw i64 %18, %17
  store i64 %19, ptr %4, align 8, !tbaa !5
  br label %20

20:                                               ; preds = %11
  %21 = load i64, ptr %5, align 8, !tbaa !5
  %22 = add nsw i64 %21, 1
  store i64 %22, ptr %5, align 8, !tbaa !5
  br label %6, !llvm.loop !9

23:                                               ; preds = %10
  %24 = load i64, ptr %3, align 8, !tbaa !5
  %25 = load i64, ptr %3, align 8, !tbaa !5
  %26 = mul nsw i64 %24, %25
  %27 = load i64, ptr %4, align 8, !tbaa !5
  %28 = sub nsw i64 %26, %27
  %29 = trunc i64 %28 to i32
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret i32 %29
}

; 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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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(none) uwtable
define dso_local i32 @solve(i64 noundef %0) local_unnamed_addr #0 {
  %2 = icmp sgt i64 %0, 0
  br i1 %2, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %1
  %3 = add nsw i64 %0, -1
  %4 = zext nneg i64 %3 to i65
  %5 = add nsw i64 %0, -2
  %6 = zext i64 %5 to i65
  %7 = mul i65 %4, %6
  %8 = lshr i65 %7, 1
  %9 = trunc nuw i65 %8 to i64
  %10 = add i64 %9, %0
  %11 = add nsw i64 %0, -3
  %12 = zext i64 %11 to i65
  %13 = mul i65 %7, %12
  %14 = lshr i65 %13, 1
  %15 = trunc nuw i65 %14 to i64
  %16 = mul i64 %15, 6148914691236517206
  %17 = add i64 %16, %0
  %18 = mul i64 %9, 3
  %19 = add i64 %17, %18
  %20 = add i64 %10, -1
  %21 = add i64 %19, -1
  br label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph.preheader, %1
  %.012.lcssa = phi i64 [ 0, %1 ], [ %20, %.lr.ph.preheader ]
  %.011.lcssa = phi i64 [ 0, %1 ], [ %21, %.lr.ph.preheader ]
  %22 = mul nuw nsw i64 %.012.lcssa, %.012.lcssa
  %23 = sub nsw i64 %22, %.011.lcssa
  %24 = trunc i64 %23 to i32
  ret i32 %24
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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" }

!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)"}


; Effective O3 passes: CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,PostOrderFunctionAttrsPass,ReassociatePass,SCCPPass,SROAPass,SimplifyCFGPass