; LLVM IR from niuyishuai/PDCABB :: LAPACK_BLAS/BLAS/TESTING (dblat2)

; 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"

@dbeg_.i__ = external hidden global i64, align 8
@dbeg_.ic = external hidden global i64, align 8
@dbeg_.mi = external hidden global i64, align 8

; 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
define dso_local double @dbeg_(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca double, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %4 = load ptr, ptr %2, align 8, !tbaa !5
  %5 = load i64, ptr %4, align 8, !tbaa !9
  %6 = icmp ne i64 %5, 0
  br i1 %6, label %7, label %9

7:                                                ; preds = %1
  store i64 891, ptr @dbeg_.mi, align 8, !tbaa !9
  store i64 7, ptr @dbeg_.i__, align 8, !tbaa !9
  store i64 0, ptr @dbeg_.ic, align 8, !tbaa !9
  %8 = load ptr, ptr %2, align 8, !tbaa !5
  store i64 0, ptr %8, align 8, !tbaa !9
  br label %9

9:                                                ; preds = %7, %1
  %10 = load i64, ptr @dbeg_.ic, align 8, !tbaa !9
  %11 = add nsw i64 %10, 1
  store i64 %11, ptr @dbeg_.ic, align 8, !tbaa !9
  br label %12

12:                                               ; preds = %23, %9
  %13 = load i64, ptr @dbeg_.mi, align 8, !tbaa !9
  %14 = load i64, ptr @dbeg_.i__, align 8, !tbaa !9
  %15 = mul nsw i64 %14, %13
  store i64 %15, ptr @dbeg_.i__, align 8, !tbaa !9
  %16 = load i64, ptr @dbeg_.i__, align 8, !tbaa !9
  %17 = sdiv i64 %16, 1000
  %18 = mul nsw i64 %17, 1000
  %19 = load i64, ptr @dbeg_.i__, align 8, !tbaa !9
  %20 = sub nsw i64 %19, %18
  store i64 %20, ptr @dbeg_.i__, align 8, !tbaa !9
  %21 = load i64, ptr @dbeg_.ic, align 8, !tbaa !9
  %22 = icmp sge i64 %21, 5
  br i1 %22, label %23, label %24

23:                                               ; preds = %12
  store i64 0, ptr @dbeg_.ic, align 8, !tbaa !9
  br label %12

24:                                               ; preds = %12
  %25 = load i64, ptr @dbeg_.i__, align 8, !tbaa !9
  %26 = sub nsw i64 %25, 500
  %27 = sitofp i64 %26 to double
  %28 = fdiv double %27, 1.001000e+03
  store double %28, ptr %3, align 8, !tbaa !11
  %29 = load double, ptr %3, align 8, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret double %29
}

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 = !{!"long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"double", !7, i64 0}


; 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"

@dbeg_.i__ = external hidden local_unnamed_addr global i64, align 8
@dbeg_.ic = external hidden local_unnamed_addr global i64, align 8
@dbeg_.mi = external hidden local_unnamed_addr global i64, align 8

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, inaccessiblemem: none) uwtable
define dso_local double @dbeg_(ptr nocapture noundef %0) local_unnamed_addr #0 {
  %2 = load i64, ptr %0, align 8, !tbaa !5
  %.not = icmp eq i64 %2, 0
  br i1 %.not, label %.peel.begin, label %3

3:                                                ; preds = %1
  store i64 891, ptr @dbeg_.mi, align 8, !tbaa !5
  store i64 7, ptr @dbeg_.i__, align 8, !tbaa !5
  store i64 0, ptr @dbeg_.ic, align 8, !tbaa !5
  store i64 0, ptr %0, align 8, !tbaa !5
  br label %.peel.begin

.peel.begin:                                      ; preds = %3, %1
  %4 = load i64, ptr @dbeg_.ic, align 8, !tbaa !5
  %5 = add nsw i64 %4, 1
  %6 = load i64, ptr @dbeg_.mi, align 8, !tbaa !5
  %.fr5 = freeze i64 %6
  %dbeg_.i__.promoted = load i64, ptr @dbeg_.i__, align 8, !tbaa !5
  %dbeg_.i__.promoted.fr = freeze i64 %dbeg_.i__.promoted
  %7 = mul i64 %dbeg_.i__.promoted.fr, %.fr5
  %8 = srem i64 %7, 1000
  %9 = icmp sgt i64 %4, 3
  br i1 %9, label %.loopexit, label %12

.loopexit:                                        ; preds = %.peel.begin
  %10 = mul i64 %8, %.fr5
  %11 = srem i64 %10, 1000
  br label %12

12:                                               ; preds = %.loopexit, %.peel.begin
  %storemerge.lcssa = phi i64 [ %5, %.peel.begin ], [ 0, %.loopexit ]
  %.lcssa = phi i64 [ %8, %.peel.begin ], [ %11, %.loopexit ]
  store i64 %storemerge.lcssa, ptr @dbeg_.ic, align 8, !tbaa !5
  store i64 %.lcssa, ptr @dbeg_.i__, align 8, !tbaa !5
  %13 = add nsw i64 %.lcssa, -500
  %14 = sitofp i64 %13 to double
  %15 = fdiv double %14, 1.001000e+03
  ret double %15
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, 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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LCSSAPass,LICMPass,LoopFullUnrollPass,PostOrderFunctionAttrsPass,SCCPPass,SROAPass,SimplifyCFGPass