; LLVM IR from turi-code/SFrame :: oss_src/parallel/pthread_tools.ll (ZN8graphlab6thread9cpu_countEv)

; 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"

@.str.11 = external hidden unnamed_addr constant [16 x i8], align 1

; 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 i64 @_ZN8graphlab6thread9cpu_countEv() #1 align 2 {
  %1 = alloca i64, align 8
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #4
  %5 = call ptr @getenv(ptr noundef @.str.11) #4
  store ptr %5, ptr %2, align 8, !tbaa !5
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = icmp ne ptr %6, null
  br i1 %7, label %8, label %20

8:                                                ; preds = %0
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  %9 = load ptr, ptr %2, align 8, !tbaa !5
  %10 = call i32 @atoi(ptr noundef %9) #5
  store i32 %10, ptr %3, align 4, !tbaa !9
  %11 = load i32, ptr %3, align 4, !tbaa !9
  %12 = icmp sgt i32 %11, 0
  br i1 %12, label %13, label %16

13:                                               ; preds = %8
  %14 = load i32, ptr %3, align 4, !tbaa !9
  %15 = sext i32 %14 to i64
  store i64 %15, ptr %1, align 8
  store i32 1, ptr %4, align 4
  br label %17

16:                                               ; preds = %8
  store i32 0, ptr %4, align 4
  br label %17

17:                                               ; preds = %16, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  %18 = load i32, ptr %4, align 4
  switch i32 %18, label %22 [
    i32 0, label %19
  ]

19:                                               ; preds = %17
  br label %20

20:                                               ; preds = %19, %0
  %21 = call i64 @sysconf(i32 noundef 83) #4
  store i64 %21, ptr %1, align 8
  store i32 1, ptr %4, align 4
  br label %22

22:                                               ; preds = %20, %17
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #4
  %23 = load i64, ptr %1, align 8
  ret i64 %23
}

; Function Attrs: nounwind
declare ptr @getenv(ptr noundef) #2

; Function Attrs: inlinehint mustprogress nounwind willreturn memory(read) uwtable
declare i32 @atoi(ptr noundef nonnull) #3

; Function Attrs: nounwind
declare i64 @sysconf(i32 noundef) #2

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 "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 #3 = { inlinehint mustprogress nounwind willreturn memory(read) 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 #4 = { nounwind }
attributes #5 = { nounwind willreturn memory(read) }

!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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !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"

@.str.11 = external hidden unnamed_addr constant [16 x i8], align 1

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_ZN8graphlab6thread9cpu_countEv() local_unnamed_addr #0 align 2 {
  %1 = tail call ptr @getenv(ptr noundef nonnull @.str.11) #4
  %.not = icmp eq ptr %1, null
  br i1 %.not, label %6, label %2

2:                                                ; preds = %0
  %3 = tail call i32 @atoi(ptr nocapture noundef %1) #5
  %4 = icmp slt i32 %3, 1
  %5 = zext nneg i32 %3 to i64
  br i1 %4, label %6, label %8

6:                                                ; preds = %2, %0
  %7 = tail call i64 @sysconf(i32 noundef 83) #4
  br label %8

8:                                                ; preds = %2, %6
  %.1 = phi i64 [ %7, %6 ], [ %5, %2 ]
  ret i64 %.1
}

; Function Attrs: nofree nounwind memory(read)
declare noundef ptr @getenv(ptr nocapture noundef) local_unnamed_addr #1

; Function Attrs: inlinehint mustprogress nofree nounwind willreturn memory(read) uwtable
declare i32 @atoi(ptr nocapture noundef nonnull) local_unnamed_addr #2

; Function Attrs: nounwind
declare i64 @sysconf(i32 noundef) local_unnamed_addr #3

attributes #0 = { 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 #1 = { nofree nounwind memory(read) "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 = { inlinehint mustprogress nofree nounwind willreturn memory(read) 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 #3 = { nounwind "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 #4 = { nounwind }
attributes #5 = { nounwind willreturn memory(read) }

!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,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,SROAPass,SimplifyCFGPass,TailCallElimPass