; LLVM IR from stan-dev/math :: lib/sundials_6.1.1/benchmarks/nvector/serial (test_nvector_performance_serial)

; 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"

@data = external hidden global ptr, align 8
@N = 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 void @ClearCache() #1 {
  %1 = alloca double, align 8
  %2 = alloca i64, align 8
  %3 = load ptr, ptr @data, align 8, !tbaa !5
  %4 = icmp ne ptr %3, null
  br i1 %4, label %5, label %21

5:                                                ; preds = %0
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #2
  store double 0.000000e+00, ptr %1, align 8, !tbaa !9
  store i64 0, ptr %2, align 8, !tbaa !11
  br label %6

6:                                                ; preds = %17, %5
  %7 = load i64, ptr %2, align 8, !tbaa !11
  %8 = load i64, ptr @N, align 8, !tbaa !11
  %9 = icmp slt i64 %7, %8
  br i1 %9, label %10, label %20

10:                                               ; preds = %6
  %11 = load ptr, ptr @data, align 8, !tbaa !5
  %12 = load i64, ptr %2, align 8, !tbaa !11
  %13 = getelementptr inbounds double, ptr %11, i64 %12
  %14 = load double, ptr %13, align 8, !tbaa !9
  %15 = load double, ptr %1, align 8, !tbaa !9
  %16 = fadd double %15, %14
  store double %16, ptr %1, align 8, !tbaa !9
  br label %17

17:                                               ; preds = %10
  %18 = load i64, ptr %2, align 8, !tbaa !11
  %19 = add nsw i64 %18, 1
  store i64 %19, ptr %2, align 8, !tbaa !11
  br label %6, !llvm.loop !13

20:                                               ; preds = %6
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #2
  br label %21

21:                                               ; preds = %20, %0
  ret void
}

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 = !{!"double", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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 void @ClearCache() local_unnamed_addr #0 {
.loopexit:
  ret void
}

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)"}


; Effective O3 passes: ADCEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass