; LLVM IR from secretflow/yacl :: yacl/utils/elapsed_timer.ll (ZN4yacl12ElapsedTimer6ResumeEv)

; 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"

%"class.std::chrono::time_point" = type { %"class.std::chrono::duration" }
%"class.std::chrono::duration" = type { i64 }
%"class.yacl::ElapsedTimer" = type <{ %"class.std::chrono::time_point", double, i8, [7 x i8] }>

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind
declare i64 @_ZNSt6chrono3_V212steady_clock3nowEv() #1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

; 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 void @_ZN4yacl12ElapsedTimer6ResumeEv(ptr noundef nonnull align 8 dereferenceable(17) %0) #3 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca %"class.std::chrono::time_point", align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %4 = load ptr, ptr %2, align 8
  %5 = getelementptr inbounds %"class.yacl::ElapsedTimer", ptr %4, i32 0, i32 2
  %6 = load i8, ptr %5, align 8, !tbaa !9, !range !16, !noundef !17
  %7 = trunc i8 %6 to i1
  br i1 %7, label %9, label %8

8:                                                ; preds = %1
  br label %15

9:                                                ; preds = %1
  %10 = getelementptr inbounds %"class.yacl::ElapsedTimer", ptr %4, i32 0, i32 2
  store i8 0, ptr %10, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #4
  %11 = call i64 @_ZNSt6chrono3_V212steady_clock3nowEv() #4
  %12 = getelementptr inbounds %"class.std::chrono::time_point", ptr %3, i32 0, i32 0
  %13 = getelementptr inbounds %"class.std::chrono::duration", ptr %12, i32 0, i32 0
  store i64 %11, ptr %13, align 8
  %14 = getelementptr inbounds %"class.yacl::ElapsedTimer", ptr %4, i32 0, i32 0
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %14, ptr align 8 %3, i64 8, i1 false), !tbaa.struct !18
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #4
  br label %15

15:                                               ; preds = %9, %8
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 #4 = { 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++ TBAA"}
!9 = !{!10, !15, i64 16}
!10 = !{!"_ZTSN4yacl12ElapsedTimerE", !11, i64 0, !14, i64 8, !15, i64 16}
!11 = !{!"_ZTSNSt6chrono10time_pointINS_3_V212steady_clockENS_8durationIlSt5ratioILl1ELl1000000000EEEEEE", !12, i64 0}
!12 = !{!"_ZTSNSt6chrono8durationIlSt5ratioILl1ELl1000000000EEEE", !13, i64 0}
!13 = !{!"long", !7, i64 0}
!14 = !{!"double", !7, i64 0}
!15 = !{!"bool", !7, i64 0}
!16 = !{i8 0, i8 2}
!17 = !{}
!18 = !{i64 0, i64 8, !19}
!19 = !{!13, !13, 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"

; Function Attrs: nounwind
declare i64 @_ZNSt6chrono3_V212steady_clock3nowEv() local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN4yacl12ElapsedTimer6ResumeEv(ptr nocapture noundef nonnull align 8 dereferenceable(17) %0) local_unnamed_addr #1 align 2 {
  %2 = getelementptr inbounds i8, ptr %0, i64 16
  %3 = load i8, ptr %2, align 8, !tbaa !5, !range !14, !noundef !15
  %4 = trunc nuw i8 %3 to i1
  br i1 %4, label %5, label %7

5:                                                ; preds = %1
  store i8 0, ptr %2, align 8, !tbaa !5
  %6 = tail call i64 @_ZNSt6chrono3_V212steady_clock3nowEv() #2
  store i64 %6, ptr %0, align 8, !tbaa !16
  br label %7

7:                                                ; preds = %1, %5
  ret void
}

attributes #0 = { 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 #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, !13, i64 16}
!6 = !{!"_ZTSN4yacl12ElapsedTimerE", !7, i64 0, !12, i64 8, !13, i64 16}
!7 = !{!"_ZTSNSt6chrono10time_pointINS_3_V212steady_clockENS_8durationIlSt5ratioILl1ELl1000000000EEEEEE", !8, i64 0}
!8 = !{!"_ZTSNSt6chrono8durationIlSt5ratioILl1ELl1000000000EEEE", !9, i64 0}
!9 = !{!"long", !10, i64 0}
!10 = !{!"omnipotent char", !11, i64 0}
!11 = !{!"Simple C++ TBAA"}
!12 = !{!"double", !10, i64 0}
!13 = !{!"bool", !10, i64 0}
!14 = !{i8 0, i8 2}
!15 = !{}
!16 = !{!9, !9, i64 0}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass