; LLVM IR from GPUOpen-LibrariesAndSDKs/TAN :: tan/common/fifo.ll (ZN10FifoBuffer10fifoLengthEv)

; 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.FifoBuffer = type <{ ptr, i32, i32, i32, [4 x i8] }>

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_ZN10FifoBuffer10fifoLengthEv(ptr noundef nonnull align 8 dereferenceable(20) %0) #0 align 2 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  %4 = load ptr, ptr %3, align 8
  %5 = getelementptr inbounds %class.FifoBuffer, ptr %4, i32 0, i32 3
  %6 = load i32, ptr %5, align 8, !tbaa !9
  %7 = getelementptr inbounds %class.FifoBuffer, ptr %4, i32 0, i32 2
  %8 = load i32, ptr %7, align 4, !tbaa !12
  %9 = icmp uge i32 %6, %8
  br i1 %9, label %10, label %16

10:                                               ; preds = %1
  %11 = getelementptr inbounds %class.FifoBuffer, ptr %4, i32 0, i32 3
  %12 = load i32, ptr %11, align 8, !tbaa !9
  %13 = getelementptr inbounds %class.FifoBuffer, ptr %4, i32 0, i32 2
  %14 = load i32, ptr %13, align 4, !tbaa !12
  %15 = sub i32 %12, %14
  store i32 %15, ptr %2, align 4
  br label %25

16:                                               ; preds = %1
  %17 = getelementptr inbounds %class.FifoBuffer, ptr %4, i32 0, i32 3
  %18 = load i32, ptr %17, align 8, !tbaa !9
  %19 = getelementptr inbounds %class.FifoBuffer, ptr %4, i32 0, i32 1
  %20 = load i32, ptr %19, align 8, !tbaa !13
  %21 = add i32 %18, %20
  %22 = getelementptr inbounds %class.FifoBuffer, ptr %4, i32 0, i32 2
  %23 = load i32, ptr %22, align 4, !tbaa !12
  %24 = sub i32 %21, %23
  store i32 %24, ptr %2, align 4
  br label %25

25:                                               ; preds = %16, %10
  %26 = load i32, ptr %2, align 4
  ret i32 %26
}

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" }

!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 16}
!10 = !{!"_ZTS10FifoBuffer", !6, i64 0, !11, i64 8, !11, i64 12, !11, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !11, i64 12}
!13 = !{!10, !11, 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 nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef i32 @_ZN10FifoBuffer10fifoLengthEv(ptr nocapture noundef nonnull readonly align 8 dereferenceable(20) %0) local_unnamed_addr #0 align 2 {
  %2 = getelementptr inbounds i8, ptr %0, i64 16
  %3 = load i32, ptr %2, align 8, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %0, i64 12
  %5 = load i32, ptr %4, align 4, !tbaa !11
  %.not = icmp ult i32 %3, %5
  %6 = getelementptr inbounds i8, ptr %0, i64 8
  %7 = load i32, ptr %6, align 8
  %8 = select i1 %.not, i32 %7, i32 0
  %.pn = sub i32 %3, %5
  %.0 = add i32 %.pn, %8
  ret i32 %.0
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) 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, !10, i64 16}
!6 = !{!"_ZTS10FifoBuffer", !7, i64 0, !10, i64 8, !10, i64 12, !10, i64 16}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !10, i64 12}


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