; LLVM IR from LeoVen/C-Macro-Collections :: examples (sieve)

; 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"

%struct.bitset = type { ptr, i64, i64, i32, ptr }

; 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 zeroext i1 @bs_flip_all(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i64, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  store i64 0, ptr %3, align 8, !tbaa !9
  br label %4

4:                                                ; preds = %19, %1
  %5 = load i64, ptr %3, align 8, !tbaa !9
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = getelementptr inbounds %struct.bitset, ptr %6, i32 0, i32 1
  %8 = load i64, ptr %7, align 8, !tbaa !11
  %9 = icmp ult i64 %5, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %4
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  br label %22

11:                                               ; preds = %4
  %12 = load ptr, ptr %2, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.bitset, ptr %12, i32 0, i32 0
  %14 = load ptr, ptr %13, align 8, !tbaa !14
  %15 = load i64, ptr %3, align 8, !tbaa !9
  %16 = getelementptr inbounds i32, ptr %14, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !15
  %18 = xor i32 %17, -1
  store i32 %18, ptr %16, align 4, !tbaa !15
  br label %19

19:                                               ; preds = %11
  %20 = load i64, ptr %3, align 8, !tbaa !9
  %21 = add i64 %20, 1
  store i64 %21, ptr %3, align 8, !tbaa !9
  br label %4, !llvm.loop !16

22:                                               ; preds = %10
  %23 = load ptr, ptr %2, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.bitset, ptr %23, i32 0, i32 3
  store i32 0, ptr %24, align 8, !tbaa !18
  ret i1 true
}

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, !10, i64 8}
!12 = !{!"bitset", !6, i64 0, !10, i64 8, !10, i64 16, !13, i64 24, !6, i64 32}
!13 = !{!"int", !7, i64 0}
!14 = !{!12, !6, i64 0}
!15 = !{!13, !13, i64 0}
!16 = distinct !{!16, !17}
!17 = !{!"llvm.loop.mustprogress"}
!18 = !{!12, !13, i64 24}


; 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: nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @bs_flip_all(ptr nocapture noundef %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 8
  %3 = load i64, ptr %2, align 8, !tbaa !5
  %.not = icmp eq i64 %3, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1
  %4 = load ptr, ptr %0, align 8, !tbaa !12
  %min.iters.check = icmp ult i64 %3, 8
  br i1 %min.iters.check, label %scalar.ph.preheader, label %vector.ph

scalar.ph.preheader:                              ; preds = %middle.block, %.lr.ph
  %.05.ph = phi i64 [ 0, %.lr.ph ], [ %n.vec, %middle.block ]
  br label %scalar.ph

vector.ph:                                        ; preds = %.lr.ph
  %n.vec = and i64 %3, -8
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %5 = getelementptr inbounds i32, ptr %4, i64 %index
  %6 = getelementptr inbounds i8, ptr %5, i64 16
  %wide.load = load <4 x i32>, ptr %5, align 4, !tbaa !13
  %wide.load6 = load <4 x i32>, ptr %6, align 4, !tbaa !13
  %7 = xor <4 x i32> %wide.load, <i32 -1, i32 -1, i32 -1, i32 -1>
  %8 = xor <4 x i32> %wide.load6, <i32 -1, i32 -1, i32 -1, i32 -1>
  store <4 x i32> %7, ptr %5, align 4, !tbaa !13
  store <4 x i32> %8, ptr %6, align 4, !tbaa !13
  %index.next = add nuw i64 %index, 8
  %9 = icmp eq i64 %index.next, %n.vec
  br i1 %9, label %middle.block, label %vector.body, !llvm.loop !14

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %3, %n.vec
  br i1 %cmp.n, label %._crit_edge, label %scalar.ph.preheader

._crit_edge:                                      ; preds = %scalar.ph, %middle.block, %1
  %10 = getelementptr inbounds i8, ptr %0, i64 24
  store i32 0, ptr %10, align 8, !tbaa !18
  ret i1 true

scalar.ph:                                        ; preds = %scalar.ph.preheader, %scalar.ph
  %.05 = phi i64 [ %14, %scalar.ph ], [ %.05.ph, %scalar.ph.preheader ]
  %11 = getelementptr inbounds i32, ptr %4, i64 %.05
  %12 = load i32, ptr %11, align 4, !tbaa !13
  %13 = xor i32 %12, -1
  store i32 %13, ptr %11, align 4, !tbaa !13
  %14 = add nuw i64 %.05, 1
  %exitcond.not = icmp eq i64 %14, %3
  br i1 %exitcond.not, label %._crit_edge, label %scalar.ph, !llvm.loop !19
}

attributes #0 = { nofree norecurse nosync nounwind 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, !10, i64 8}
!6 = !{!"bitset", !7, i64 0, !10, i64 8, !10, i64 16, !11, i64 24, !7, i64 32}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"long", !8, i64 0}
!11 = !{!"int", !8, i64 0}
!12 = !{!6, !7, i64 0}
!13 = !{!11, !11, i64 0}
!14 = distinct !{!14, !15, !16, !17}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!"llvm.loop.isvectorized", i32 1}
!17 = !{!"llvm.loop.unroll.runtime.disable"}
!18 = !{!6, !11, i64 24}
!19 = distinct !{!19, !15, !17, !16}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass