; LLVM IR from zeux/meshoptimizer :: src (quantization)

; 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"

%union.FloatBits = type { float }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local float @meshopt_dequantizeHalf(i16 noundef zeroext %0) #1 {
  %2 = alloca i16, align 2
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca %union.FloatBits, align 4
  store i16 %0, ptr %2, align 2, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  %7 = load i16, ptr %2, align 2, !tbaa !5
  %8 = zext i16 %7 to i32
  %9 = and i32 %8, 32768
  %10 = shl i32 %9, 16
  store i32 %10, ptr %3, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %11 = load i16, ptr %2, align 2, !tbaa !5
  %12 = zext i16 %11 to i32
  %13 = and i32 %12, 32767
  store i32 %13, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %14 = load i32, ptr %4, align 4, !tbaa !9
  %15 = add nsw i32 %14, 114688
  %16 = shl i32 %15, 13
  store i32 %16, ptr %5, align 4, !tbaa !9
  %17 = load i32, ptr %4, align 4, !tbaa !9
  %18 = icmp slt i32 %17, 1024
  br i1 %18, label %19, label %20

19:                                               ; preds = %1
  br label %22

20:                                               ; preds = %1
  %21 = load i32, ptr %5, align 4, !tbaa !9
  br label %22

22:                                               ; preds = %20, %19
  %23 = phi i32 [ 0, %19 ], [ %21, %20 ]
  store i32 %23, ptr %5, align 4, !tbaa !9
  %24 = load i32, ptr %4, align 4, !tbaa !9
  %25 = icmp sge i32 %24, 31744
  %26 = zext i1 %25 to i64
  %27 = select i1 %25, i32 939524096, i32 0
  %28 = load i32, ptr %5, align 4, !tbaa !9
  %29 = add nsw i32 %28, %27
  store i32 %29, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %30 = load i32, ptr %3, align 4, !tbaa !9
  %31 = load i32, ptr %5, align 4, !tbaa !9
  %32 = or i32 %30, %31
  store i32 %32, ptr %6, align 4, !tbaa !11
  %33 = load float, ptr %6, align 4, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret float %33
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = !{!"short", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!7, !7, i64 0}


; 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(none) uwtable
define dso_local float @meshopt_dequantizeHalf(i16 noundef zeroext %0) local_unnamed_addr #0 {
  %.signext = sext i16 %0 to i32
  %2 = and i32 %.signext, -2147483648
  %3 = and i16 %0, 32767
  %4 = zext nneg i16 %3 to i32
  %5 = shl nuw nsw i32 %4, 13
  %6 = add nuw nsw i32 %5, 939524096
  %7 = icmp ult i16 %3, 1024
  %8 = select i1 %7, i32 0, i32 %6
  %9 = icmp ugt i16 %3, 31743
  %10 = select i1 %9, i32 939524096, i32 0
  %11 = add nuw nsw i32 %8, %10
  %12 = or disjoint i32 %11, %2
  %13 = bitcast i32 %12 to float
  ret float %13
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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)"}


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