; LLVM IR from FRC-Utilities/LibDS :: src (crc32)

; 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 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [65 x i8], align 1
@__PRETTY_FUNCTION__.DS_CRC32 = external hidden unnamed_addr constant [40 x i8], align 1
@crc32_tab = external hidden global [256 x i32], align 16

; Function Attrs: nounwind uwtable
define dso_local i32 @DS_CRC32(ptr noundef %0, i64 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !9
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  %8 = icmp ne ptr %7, null
  br i1 %8, label %9, label %10

9:                                                ; preds = %2
  br label %11

10:                                               ; preds = %2
  call void @__assert_fail(ptr noundef @.str, ptr noundef @.str.1, i32 noundef 80, ptr noundef @__PRETTY_FUNCTION__.DS_CRC32) #3
  unreachable

11:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  store i32 -1, ptr %6, align 4, !tbaa !11
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %12, ptr %5, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %17, %11
  %14 = load i64, ptr %4, align 8, !tbaa !9
  %15 = add i64 %14, -1
  store i64 %15, ptr %4, align 8, !tbaa !9
  %16 = icmp ne i64 %14, 0
  br i1 %16, label %17, label %31

17:                                               ; preds = %13
  %18 = load i32, ptr %6, align 4, !tbaa !11
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = getelementptr inbounds i8, ptr %19, i32 1
  store ptr %20, ptr %5, align 8, !tbaa !5
  %21 = load i8, ptr %19, align 1, !tbaa !13
  %22 = zext i8 %21 to i32
  %23 = xor i32 %18, %22
  %24 = and i32 %23, 255
  %25 = zext i32 %24 to i64
  %26 = getelementptr inbounds [256 x i32], ptr @crc32_tab, i64 0, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !11
  %28 = load i32, ptr %6, align 4, !tbaa !11
  %29 = lshr i32 %28, 8
  %30 = xor i32 %27, %29
  store i32 %30, ptr %6, align 4, !tbaa !11
  br label %13, !llvm.loop !14

31:                                               ; preds = %13
  %32 = load i32, ptr %6, align 4, !tbaa !11
  %33 = zext i32 %32 to i64
  %34 = xor i64 %33, 4294967295
  %35 = trunc i64 %34 to i32
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #4
  ret i32 %35
}

; Function Attrs: noreturn nounwind
declare void @__assert_fail(ptr noundef, ptr noundef, i32 noundef, ptr noundef) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

attributes #0 = { 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 = { noreturn 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 nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { noreturn nounwind }
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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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"

@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [65 x i8], align 1
@__PRETTY_FUNCTION__.DS_CRC32 = external hidden unnamed_addr constant [40 x i8], align 1
@crc32_tab = external hidden local_unnamed_addr global [256 x i32], align 16

; Function Attrs: nounwind uwtable
define dso_local i32 @DS_CRC32(ptr noundef readonly %0, i64 noundef %1) local_unnamed_addr #0 {
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %4, label %.preheader

.preheader:                                       ; preds = %2
  %.not910 = icmp eq i64 %1, 0
  br i1 %.not910, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %.preheader
  %xtraiter = and i64 %1, 1
  %3 = icmp eq i64 %1, 1
  br i1 %3, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %1, -2
  br label %.lr.ph

4:                                                ; preds = %2
  tail call void @__assert_fail(ptr noundef nonnull @.str, ptr noundef nonnull @.str.1, i32 noundef 80, ptr noundef nonnull @__PRETTY_FUNCTION__.DS_CRC32) #2
  unreachable

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %.013 = phi i32 [ -1, %.lr.ph.preheader.new ], [ %18, %.lr.ph ]
  %.0612 = phi ptr [ %0, %.lr.ph.preheader.new ], [ %12, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %.lr.ph ]
  %5 = getelementptr inbounds i8, ptr %.0612, i64 1
  %6 = load i8, ptr %.0612, align 1, !tbaa !5
  %.0.tr = trunc i32 %.013 to i8
  %.narrow = xor i8 %6, %.0.tr
  %7 = zext i8 %.narrow to i64
  %8 = getelementptr inbounds [256 x i32], ptr @crc32_tab, i64 0, i64 %7
  %9 = load i32, ptr %8, align 4, !tbaa !8
  %10 = lshr i32 %.013, 8
  %11 = xor i32 %9, %10
  %12 = getelementptr inbounds i8, ptr %.0612, i64 2
  %13 = load i8, ptr %5, align 1, !tbaa !5
  %.0.tr.1 = trunc i32 %11 to i8
  %.narrow.1 = xor i8 %13, %.0.tr.1
  %14 = zext i8 %.narrow.1 to i64
  %15 = getelementptr inbounds [256 x i32], ptr @crc32_tab, i64 0, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !8
  %17 = lshr i32 %11, 8
  %18 = xor i32 %16, %17
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
  br i1 %niter.ncmp.1, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !10

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.lcssa.ph = phi i32 [ poison, %.lr.ph.preheader ], [ %18, %.lr.ph ]
  %.013.unr = phi i32 [ -1, %.lr.ph.preheader ], [ %18, %.lr.ph ]
  %.0612.unr = phi ptr [ %0, %.lr.ph.preheader ], [ %12, %.lr.ph ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge.loopexit, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.loopexit.unr-lcssa
  %19 = load i8, ptr %.0612.unr, align 1, !tbaa !5
  %.0.tr.epil = trunc i32 %.013.unr to i8
  %.narrow.epil = xor i8 %19, %.0.tr.epil
  %20 = zext i8 %.narrow.epil to i64
  %21 = getelementptr inbounds [256 x i32], ptr @crc32_tab, i64 0, i64 %20
  %22 = load i32, ptr %21, align 4, !tbaa !8
  %23 = lshr i32 %.013.unr, 8
  %24 = xor i32 %22, %23
  br label %._crit_edge.loopexit

._crit_edge.loopexit:                             ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil
  %.lcssa = phi i32 [ %.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %24, %.lr.ph.epil ]
  %25 = xor i32 %.lcssa, -1
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %.preheader
  %.0.lcssa = phi i32 [ 0, %.preheader ], [ %25, %._crit_edge.loopexit ]
  ret i32 %.0.lcssa
}

; Function Attrs: noreturn nounwind
declare void @__assert_fail(ptr noundef, ptr noundef, i32 noundef, ptr noundef) local_unnamed_addr #1

attributes #0 = { 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 = { noreturn 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 = { noreturn 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"int", !6, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass