; LLVM IR from GCY/wxECGAnalyzer :: embedded/stm32f407 - 360Hz/src/stm32f4/algorithm (Pan_Tompkins_detect)

; 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"

@HighPassFilter.y1 = external hidden global i32, align 4
@HighPassFilter.x = external hidden global [66 x i32], align 16
@HighPassFilter.n = external hidden global i32, align 4

; 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 i32 @HighPassFilter(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  %4 = load i32, ptr %2, align 4, !tbaa !5
  %5 = load i32, ptr @HighPassFilter.n, align 4, !tbaa !5
  %6 = add nsw i32 %5, 33
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds [66 x i32], ptr @HighPassFilter.x, i64 0, i64 %7
  store i32 %4, ptr %8, align 4, !tbaa !5
  %9 = load i32, ptr @HighPassFilter.n, align 4, !tbaa !5
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds [66 x i32], ptr @HighPassFilter.x, i64 0, i64 %10
  store i32 %4, ptr %11, align 4, !tbaa !5
  %12 = load i32, ptr @HighPassFilter.y1, align 4, !tbaa !5
  %13 = load i32, ptr @HighPassFilter.n, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [66 x i32], ptr @HighPassFilter.x, i64 0, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = add nsw i32 %12, %16
  %18 = load i32, ptr @HighPassFilter.n, align 4, !tbaa !5
  %19 = add nsw i32 %18, 32
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [66 x i32], ptr @HighPassFilter.x, i64 0, i64 %20
  %22 = load i32, ptr %21, align 4, !tbaa !5
  %23 = sub nsw i32 %17, %22
  store i32 %23, ptr %3, align 4, !tbaa !5
  %24 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %24, ptr @HighPassFilter.y1, align 4, !tbaa !5
  %25 = load i32, ptr @HighPassFilter.n, align 4, !tbaa !5
  %26 = add nsw i32 %25, -1
  store i32 %26, ptr @HighPassFilter.n, align 4, !tbaa !5
  %27 = icmp slt i32 %26, 0
  br i1 %27, label %28, label %29

28:                                               ; preds = %1
  store i32 32, ptr @HighPassFilter.n, align 4, !tbaa !5
  br label %29

29:                                               ; preds = %28, %1
  %30 = load i32, ptr @HighPassFilter.n, align 4, !tbaa !5
  %31 = add nsw i32 %30, 16
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [66 x i32], ptr @HighPassFilter.x, i64 0, i64 %32
  %34 = load i32, ptr %33, align 4, !tbaa !5
  %35 = load i32, ptr %3, align 4, !tbaa !5
  %36 = ashr i32 %35, 5
  %37 = sub nsw i32 %34, %36
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %37
}

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 = !{!"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"

@HighPassFilter.y1 = external hidden local_unnamed_addr global i32, align 4
@HighPassFilter.x = external hidden local_unnamed_addr global [66 x i32], align 16
@HighPassFilter.n = external hidden local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local i32 @HighPassFilter(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @HighPassFilter.n, align 4, !tbaa !5
  %3 = add nsw i32 %2, 33
  %4 = sext i32 %3 to i64
  %5 = getelementptr inbounds [66 x i32], ptr @HighPassFilter.x, i64 0, i64 %4
  store i32 %0, ptr %5, align 4, !tbaa !5
  %6 = sext i32 %2 to i64
  %7 = getelementptr inbounds [66 x i32], ptr @HighPassFilter.x, i64 0, i64 %6
  store i32 %0, ptr %7, align 4, !tbaa !5
  %8 = load i32, ptr @HighPassFilter.y1, align 4, !tbaa !5
  %9 = add nsw i32 %8, %0
  %10 = add nsw i32 %2, 32
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds [66 x i32], ptr @HighPassFilter.x, i64 0, i64 %11
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %14 = sub i32 %9, %13
  store i32 %14, ptr @HighPassFilter.y1, align 4, !tbaa !5
  %15 = add nsw i32 %2, -1
  %16 = icmp slt i32 %2, 1
  %spec.store.select = select i1 %16, i32 32, i32 %15
  store i32 %spec.store.select, ptr @HighPassFilter.n, align 4
  %17 = add nsw i32 %spec.store.select, 16
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [66 x i32], ptr @HighPassFilter.x, i64 0, i64 %18
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %21 = ashr i32 %14, 5
  %22 = sub nsw i32 %20, %21
  ret i32 %22
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn 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: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass