; LLVM IR from SSBMTonberry/pocketlzma :: ref_spec/lzma1900/C (Xz)

; 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"

; Function Attrs: nounwind uwtable
define dso_local i32 @Xz_WriteVarInt(ptr noundef %0, i64 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !11
  br label %6

6:                                                ; preds = %18, %2
  %7 = load i64, ptr %4, align 8, !tbaa !9
  %8 = and i64 %7, 127
  %9 = or i64 %8, 128
  %10 = trunc i64 %9 to i8
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = load i32, ptr %5, align 4, !tbaa !11
  %13 = add i32 %12, 1
  store i32 %13, ptr %5, align 4, !tbaa !11
  %14 = zext i32 %12 to i64
  %15 = getelementptr inbounds i8, ptr %11, i64 %14
  store i8 %10, ptr %15, align 1, !tbaa !13
  %16 = load i64, ptr %4, align 8, !tbaa !9
  %17 = lshr i64 %16, 7
  store i64 %17, ptr %4, align 8, !tbaa !9
  br label %18

18:                                               ; preds = %6
  %19 = load i64, ptr %4, align 8, !tbaa !9
  %20 = icmp ne i64 %19, 0
  br i1 %20, label %6, label %21, !llvm.loop !14

21:                                               ; preds = %18
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  %23 = load i32, ptr %5, align 4, !tbaa !11
  %24 = zext i32 %23 to i64
  %25 = sub i64 %24, 1
  %26 = getelementptr inbounds i8, ptr %22, i64 %25
  %27 = load i8, ptr %26, align 1, !tbaa !13
  %28 = zext i8 %27 to i32
  %29 = and i32 %28, 127
  %30 = trunc i32 %29 to i8
  store i8 %30, ptr %26, align 1, !tbaa !13
  %31 = load i32, ptr %5, align 4, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i32 %31
}

; 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 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long 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"

; Function Attrs: nofree norecurse nosync nounwind memory(argmem: readwrite) uwtable
define dso_local i32 @Xz_WriteVarInt(ptr nocapture noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  br label %3

3:                                                ; preds = %3, %2
  %indvars.iv = phi i64 [ %indvars.iv.next, %3 ], [ 0, %2 ]
  %.07 = phi i64 [ %7, %3 ], [ %1, %2 ]
  %4 = trunc i64 %.07 to i8
  %5 = or i8 %4, -128
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %6 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  store i8 %5, ptr %6, align 1, !tbaa !5
  %7 = lshr i64 %.07, 7
  %.not = icmp ult i64 %.07, 128
  br i1 %.not, label %8, label %3, !llvm.loop !8

8:                                                ; preds = %3
  %9 = trunc nuw nsw i64 %indvars.iv.next to i32
  %10 = and i64 %indvars.iv.next, 4294967295
  %11 = getelementptr i8, ptr %0, i64 %10
  %12 = getelementptr i8, ptr %11, i64 -1
  %13 = load i8, ptr %12, align 1, !tbaa !5
  %14 = and i8 %13, 127
  store i8 %14, ptr %12, align 1, !tbaa !5
  ret i32 %9
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: readwrite) 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/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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