; LLVM IR from swiftlang/swift :: utils/embedded-test-support (demo)

; 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"

@global2 = external dso_local global i32, align 4

; Function Attrs: noinline nounwind uwtable
define dso_local i32 @recur(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %6 = load i32, ptr %4, align 4, !tbaa !5
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %8, label %9

8:                                                ; preds = %2
  store i32 1, ptr %3, align 4
  br label %18

9:                                                ; preds = %2
  %10 = load i32, ptr @global2, align 4, !tbaa !5
  %11 = add nsw i32 %10, 1
  store i32 %11, ptr @global2, align 4, !tbaa !5
  %12 = load i32, ptr %4, align 4, !tbaa !5
  %13 = load i32, ptr %5, align 4, !tbaa !5
  %14 = sub nsw i32 %12, %13
  %15 = load i32, ptr %5, align 4, !tbaa !5
  %16 = call i32 @recur(i32 noundef %14, i32 noundef %15)
  %17 = add nsw i32 %16, 1
  store i32 %17, ptr %3, align 4
  br label %18

18:                                               ; preds = %9, %8
  %19 = load i32, ptr %3, align 4
  ret i32 %19
}

attributes #0 = { noinline 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" }

!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/C++ TBAA"}


; 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"

@global2 = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: nofree noinline norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local i32 @recur(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq i32 %0, 0
  br i1 %3, label %10, label %tailrecurse.preheader

tailrecurse.preheader:                            ; preds = %2
  %global2.promoted = load i32, ptr @global2, align 4, !tbaa !5
  br label %tailrecurse

tailrecurse:                                      ; preds = %tailrecurse.preheader, %tailrecurse
  %.tr8 = phi i32 [ %6, %tailrecurse ], [ %0, %tailrecurse.preheader ]
  %accumulator.tr7 = phi i32 [ %7, %tailrecurse ], [ 0, %tailrecurse.preheader ]
  %4 = phi i32 [ %5, %tailrecurse ], [ %global2.promoted, %tailrecurse.preheader ]
  %5 = add nsw i32 %4, 1
  %6 = sub nsw i32 %.tr8, %1
  %7 = add nuw nsw i32 %accumulator.tr7, 1
  %8 = icmp eq i32 %6, 0
  br i1 %8, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse._crit_edge:                           ; preds = %tailrecurse
  store i32 %5, ptr @global2, align 4, !tbaa !5
  %9 = add nuw nsw i32 %accumulator.tr7, 2
  br label %10

10:                                               ; preds = %tailrecurse._crit_edge, %2
  %accumulator.tr.lcssa = phi i32 [ %9, %tailrecurse._crit_edge ], [ 1, %2 ]
  ret i32 %accumulator.tr.lcssa
}

attributes #0 = { nofree noinline norecurse nosync nounwind memory(readwrite, argmem: none, 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" }

!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/C++ TBAA"}


; Effective O3 passes: GVNPass,GlobalOptPass,InferAlignmentPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass