; LLVM IR from SSBMTonberry/pocketlzma :: ref_spec/lzma1900/CPP/7zip/Bundles/LzmaSpec/LzmaSpec.ll (ZN13CRangeDecoder9NormalizeEv)

; 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"

%class.CRangeDecoder = type <{ i32, i32, ptr, i8, [7 x i8] }>

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i8 @_ZN12CInputStream8ReadByteEv(ptr noundef nonnull align 8 dereferenceable(16)) #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN13CRangeDecoder9NormalizeEv(ptr noundef nonnull align 8 dereferenceable(17) %0) #0 align 2 {
  %2 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %3 = load ptr, ptr %2, align 8
  %4 = getelementptr inbounds %class.CRangeDecoder, ptr %3, i32 0, i32 0
  %5 = load i32, ptr %4, align 8, !tbaa !9
  %6 = icmp ult i32 %5, 16777216
  br i1 %6, label %7, label %20

7:                                                ; preds = %1
  %8 = getelementptr inbounds %class.CRangeDecoder, ptr %3, i32 0, i32 0
  %9 = load i32, ptr %8, align 8, !tbaa !9
  %10 = shl i32 %9, 8
  store i32 %10, ptr %8, align 8, !tbaa !9
  %11 = getelementptr inbounds %class.CRangeDecoder, ptr %3, i32 0, i32 1
  %12 = load i32, ptr %11, align 4, !tbaa !13
  %13 = shl i32 %12, 8
  %14 = getelementptr inbounds %class.CRangeDecoder, ptr %3, i32 0, i32 2
  %15 = load ptr, ptr %14, align 8, !tbaa !14
  %16 = call noundef zeroext i8 @_ZN12CInputStream8ReadByteEv(ptr noundef nonnull align 8 dereferenceable(16) %15)
  %17 = zext i8 %16 to i32
  %18 = or i32 %13, %17
  %19 = getelementptr inbounds %class.CRangeDecoder, ptr %3, i32 0, i32 1
  store i32 %18, ptr %19, align 4, !tbaa !13
  br label %20

20:                                               ; preds = %7, %1
  ret void
}

attributes #0 = { mustprogress 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !11, i64 0}
!10 = !{!"_ZTS13CRangeDecoder", !11, i64 0, !11, i64 4, !6, i64 8, !12, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!"bool", !7, i64 0}
!13 = !{!10, !11, i64 4}
!14 = !{!10, !6, i64 8}


; 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: mustprogress uwtable
declare dso_local noundef zeroext i8 @_ZN12CInputStream8ReadByteEv(ptr noundef nonnull align 8 dereferenceable(16)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN13CRangeDecoder9NormalizeEv(ptr nocapture noundef nonnull align 8 dereferenceable(17) %0) local_unnamed_addr #0 align 2 {
  %2 = load i32, ptr %0, align 8, !tbaa !5
  %3 = icmp ult i32 %2, 16777216
  br i1 %3, label %4, label %14

4:                                                ; preds = %1
  %5 = shl nuw i32 %2, 8
  store i32 %5, ptr %0, align 8, !tbaa !5
  %6 = getelementptr inbounds i8, ptr %0, i64 4
  %7 = load i32, ptr %6, align 4, !tbaa !12
  %8 = shl i32 %7, 8
  %9 = getelementptr inbounds i8, ptr %0, i64 8
  %10 = load ptr, ptr %9, align 8, !tbaa !13
  %11 = tail call noundef zeroext i8 @_ZN12CInputStream8ReadByteEv(ptr noundef nonnull align 8 dereferenceable(16) %10)
  %12 = zext i8 %11 to i32
  %13 = or disjoint i32 %8, %12
  store i32 %13, ptr %6, align 4, !tbaa !12
  br label %14

14:                                               ; preds = %4, %1
  ret void
}

attributes #0 = { mustprogress 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, !7, i64 0}
!6 = !{!"_ZTS13CRangeDecoder", !7, i64 0, !7, i64 4, !10, i64 8, !11, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!"bool", !8, i64 0}
!12 = !{!6, !7, i64 4}
!13 = !{!6, !10, i64 8}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,TailCallElimPass