; LLVM IR from sunkafei/xcpc-algorithm-templates :: 算法/数学算法/递推式求解.ll (Z7pow_modix)

; 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: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z7pow_modix(i32 noundef %0, i64 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 1, ptr %5, align 4, !tbaa !5
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = srem i32 %6, 1000000007
  store i32 %7, ptr %3, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %24, %2
  %9 = load i64, ptr %4, align 8, !tbaa !9
  %10 = icmp ne i64 %9, 0
  br i1 %10, label %11, label %35

11:                                               ; preds = %8
  %12 = load i64, ptr %4, align 8, !tbaa !9
  %13 = and i64 %12, 1
  %14 = icmp ne i64 %13, 0
  br i1 %14, label %15, label %24

15:                                               ; preds = %11
  %16 = load i32, ptr %5, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = mul nsw i64 1, %17
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = mul nsw i64 %18, %20
  %22 = srem i64 %21, 1000000007
  %23 = trunc i64 %22 to i32
  store i32 %23, ptr %5, align 4, !tbaa !5
  br label %24

24:                                               ; preds = %15, %11
  %25 = load i32, ptr %3, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = mul nsw i64 1, %26
  %28 = load i32, ptr %3, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = mul nsw i64 %27, %29
  %31 = srem i64 %30, 1000000007
  %32 = trunc i64 %31 to i32
  store i32 %32, ptr %3, align 4, !tbaa !5
  %33 = load i64, ptr %4, align 8, !tbaa !9
  %34 = ashr i64 %33, 1
  store i64 %34, ptr %4, align 8, !tbaa !9
  br label %8, !llvm.loop !11

35:                                               ; preds = %8
  %36 = load i32, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i32 %36
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long long", !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(none) uwtable
define dso_local noundef range(i32 -1000000006, 1000000007) i32 @_Z7pow_modix(i32 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %.not12 = icmp eq i64 %1, 0
  br i1 %.not12, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %3 = srem i32 %0, 1000000007
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %11
  %.015 = phi i32 [ %.1, %11 ], [ 1, %.lr.ph.preheader ]
  %.0914 = phi i64 [ %15, %11 ], [ %1, %.lr.ph.preheader ]
  %.01013 = phi i32 [ %14, %11 ], [ %3, %.lr.ph.preheader ]
  %4 = and i64 %.0914, 1
  %.not11 = icmp eq i64 %4, 0
  br i1 %.not11, label %.lr.ph._crit_edge, label %5

.lr.ph._crit_edge:                                ; preds = %.lr.ph
  %.pre = sext i32 %.01013 to i64
  br label %11

5:                                                ; preds = %.lr.ph
  %6 = sext i32 %.015 to i64
  %7 = sext i32 %.01013 to i64
  %8 = mul nsw i64 %6, %7
  %9 = srem i64 %8, 1000000007
  %10 = trunc nsw i64 %9 to i32
  br label %11

11:                                               ; preds = %.lr.ph._crit_edge, %5
  %.pre-phi = phi i64 [ %.pre, %.lr.ph._crit_edge ], [ %7, %5 ]
  %.1 = phi i32 [ %.015, %.lr.ph._crit_edge ], [ %10, %5 ]
  %12 = mul nsw i64 %.pre-phi, %.pre-phi
  %13 = urem i64 %12, 1000000007
  %14 = trunc nuw nsw i64 %13 to i32
  %15 = ashr i64 %.0914, 1
  %.not = icmp ult i64 %.0914, 2
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5

._crit_edge:                                      ; preds = %11, %2
  %.0.lcssa = phi i32 [ 1, %2 ], [ %.1, %11 ]
  ret i32 %.0.lcssa
}

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)"}
!5 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass