; LLVM IR from CactiLab/Sherloc-Cortex-M-CFVD :: Sherloc_runtime/evaluation/src/crc32 (crc_32)

; 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"

@crc_32_tab = external hidden constant [256 x i64], align 16

; Function Attrs: nounwind uwtable
define dso_local i64 @crc32pseudo() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i64, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #2
  store i64 4294967295, ptr %2, align 8, !tbaa !5
  store i32 0, ptr %1, align 4, !tbaa !9
  br label %3

3:                                                ; preds = %18, %0
  %4 = load i32, ptr %1, align 4, !tbaa !9
  %5 = icmp slt i32 %4, 1024
  br i1 %5, label %6, label %21

6:                                                ; preds = %3
  %7 = load i64, ptr %2, align 8, !tbaa !5
  %8 = call i32 @rand_beebs()
  %9 = trunc i32 %8 to i8
  %10 = zext i8 %9 to i64
  %11 = xor i64 %7, %10
  %12 = and i64 %11, 255
  %13 = getelementptr inbounds [256 x i64], ptr @crc_32_tab, i64 0, i64 %12
  %14 = load i64, ptr %13, align 8, !tbaa !5
  %15 = load i64, ptr %2, align 8, !tbaa !5
  %16 = lshr i64 %15, 8
  %17 = xor i64 %14, %16
  store i64 %17, ptr %2, align 8, !tbaa !5
  br label %18

18:                                               ; preds = %6
  %19 = load i32, ptr %1, align 4, !tbaa !9
  %20 = add nsw i32 %19, 1
  store i32 %20, ptr %1, align 4, !tbaa !9
  br label %3, !llvm.loop !11

21:                                               ; preds = %3
  %22 = load i64, ptr %2, align 8, !tbaa !5
  %23 = xor i64 %22, -1
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  ret i64 %23
}

; 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

; Function Attrs: nounwind uwtable
declare hidden i32 @rand_beebs() #0

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 = { 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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

@crc_32_tab = external hidden local_unnamed_addr constant [256 x i64], align 16

; Function Attrs: nounwind uwtable
define dso_local i64 @crc32pseudo() local_unnamed_addr #0 {
  br label %1

1:                                                ; preds = %0, %1
  %.07 = phi i64 [ 4294967295, %0 ], [ %9, %1 ]
  %.056 = phi i32 [ 0, %0 ], [ %10, %1 ]
  %2 = tail call i32 @rand_beebs()
  %3 = zext i32 %2 to i64
  %4 = xor i64 %.07, %3
  %5 = and i64 %4, 255
  %6 = getelementptr inbounds [256 x i64], ptr @crc_32_tab, i64 0, i64 %5
  %7 = load i64, ptr %6, align 8, !tbaa !5
  %8 = lshr i64 %.07, 8
  %9 = xor i64 %7, %8
  %10 = add nuw nsw i32 %.056, 1
  %exitcond.not = icmp eq i32 %10, 1024
  br i1 %exitcond.not, label %11, label %1, !llvm.loop !9

11:                                               ; preds = %1
  %12 = xor i64 %9, -1
  ret i64 %12
}

; Function Attrs: nounwind uwtable
declare hidden i32 @rand_beebs() local_unnamed_addr #0

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" }

!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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopUnrollPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass