; LLVM IR from XiaoMi/mace :: mace/port/env.ll (ZN4mace4port3Env14CalculateCRC32EPKhm)

; 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"

@_ZZN4mace4port3Env14CalculateCRC32EPKhmE11crc32_table = external hidden constant [256 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_ZN4mace4port3Env14CalculateCRC32EPKhm(ptr noundef nonnull align 8 dereferenceable(8) %0, ptr noundef %1, i64 noundef %2) unnamed_addr #0 align 2 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  %8 = alloca i64, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i64 %2, ptr %6, align 8, !tbaa !9
  %9 = load ptr, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 -1, ptr %7, align 4, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  store i64 0, ptr %8, align 8, !tbaa !9
  br label %10

10:                                               ; preds = %28, %3
  %11 = load i64, ptr %8, align 8, !tbaa !9
  %12 = load i64, ptr %6, align 8, !tbaa !9
  %13 = icmp ult i64 %11, %12
  br i1 %13, label %14, label %31

14:                                               ; preds = %10
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = getelementptr inbounds i8, ptr %15, i32 1
  store ptr %16, ptr %5, align 8, !tbaa !5
  %17 = load i8, ptr %15, align 1, !tbaa !13
  %18 = zext i8 %17 to i32
  %19 = load i32, ptr %7, align 4, !tbaa !11
  %20 = and i32 %19, 255
  %21 = xor i32 %18, %20
  %22 = zext i32 %21 to i64
  %23 = getelementptr inbounds [256 x i32], ptr @_ZZN4mace4port3Env14CalculateCRC32EPKhmE11crc32_table, i64 0, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !11
  %25 = load i32, ptr %7, align 4, !tbaa !11
  %26 = lshr i32 %25, 8
  %27 = xor i32 %24, %26
  store i32 %27, ptr %7, align 4, !tbaa !11
  br label %28

28:                                               ; preds = %14
  %29 = load i64, ptr %8, align 8, !tbaa !9
  %30 = add i64 %29, 1
  store i64 %30, ptr %8, align 8, !tbaa !9
  br label %10, !llvm.loop !14

31:                                               ; preds = %10
  %32 = load i32, ptr %7, align 4, !tbaa !11
  %33 = xor i32 %32, -1
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 %33
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { 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 #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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++ 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"

@_ZZN4mace4port3Env14CalculateCRC32EPKhmE11crc32_table = external hidden local_unnamed_addr constant [256 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_ZN4mace4port3Env14CalculateCRC32EPKhm(ptr nocapture noundef nonnull readnone align 8 dereferenceable(8) %0, ptr nocapture noundef readonly %1, i64 noundef %2) unnamed_addr #0 align 2 {
  %.not = icmp eq i64 %2, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %xtraiter = and i64 %2, 1
  %4 = icmp eq i64 %2, 1
  br i1 %4, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

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

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %.0710 = phi i32 [ -1, %.lr.ph.preheader.new ], [ %24, %.lr.ph ]
  %.089 = phi ptr [ %1, %.lr.ph.preheader.new ], [ %15, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %.lr.ph ]
  %5 = getelementptr inbounds i8, ptr %.089, i64 1
  %6 = load i8, ptr %.089, align 1, !tbaa !5
  %7 = zext i8 %6 to i32
  %8 = and i32 %.0710, 255
  %9 = xor i32 %8, %7
  %10 = zext nneg i32 %9 to i64
  %11 = getelementptr inbounds [256 x i32], ptr @_ZZN4mace4port3Env14CalculateCRC32EPKhmE11crc32_table, i64 0, i64 %10
  %12 = load i32, ptr %11, align 4, !tbaa !8
  %13 = lshr i32 %.0710, 8
  %14 = xor i32 %12, %13
  %15 = getelementptr inbounds i8, ptr %.089, i64 2
  %16 = load i8, ptr %5, align 1, !tbaa !5
  %17 = zext i8 %16 to i32
  %18 = and i32 %14, 255
  %19 = xor i32 %18, %17
  %20 = zext nneg i32 %19 to i64
  %21 = getelementptr inbounds [256 x i32], ptr @_ZZN4mace4port3Env14CalculateCRC32EPKhmE11crc32_table, i64 0, i64 %20
  %22 = load i32, ptr %21, align 4, !tbaa !8
  %23 = lshr i32 %14, 8
  %24 = xor i32 %22, %23
  %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 ], [ %24, %.lr.ph ]
  %.0710.unr = phi i32 [ -1, %.lr.ph.preheader ], [ %24, %.lr.ph ]
  %.089.unr = phi ptr [ %1, %.lr.ph.preheader ], [ %15, %.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
  %25 = load i8, ptr %.089.unr, align 1, !tbaa !5
  %26 = zext i8 %25 to i32
  %27 = and i32 %.0710.unr, 255
  %28 = xor i32 %27, %26
  %29 = zext nneg i32 %28 to i64
  %30 = getelementptr inbounds [256 x i32], ptr @_ZZN4mace4port3Env14CalculateCRC32EPKhmE11crc32_table, i64 0, i64 %29
  %31 = load i32, ptr %30, align 4, !tbaa !8
  %32 = lshr i32 %.0710.unr, 8
  %33 = xor i32 %31, %32
  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 ], [ %33, %.lr.ph.epil ]
  %34 = xor i32 %.lcssa, -1
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %3
  %.07.lcssa = phi i32 [ 0, %3 ], [ %34, %._crit_edge.loopexit ]
  ret i32 %.07.lcssa
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"int", !6, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


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