; LLVM IR from NVIDIA/TensorRT :: samples/common/bfloat16.ll (ZN6sample8BFloat16C2Ef)

; 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.sample::BFloat16" = type { i16 }

; 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 nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1

; 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 void @_ZN6sample8BFloat16C2Ef(ptr noundef nonnull align 2 dereferenceable(2) %0, float noundef %1) unnamed_addr #2 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca float, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store float %1, ptr %4, align 4, !tbaa !9
  %7 = load ptr, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !11
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %5, ptr align 4 %4, i64 4, i1 false)
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 2139095040, ptr %6, align 4, !tbaa !11
  %8 = load i32, ptr %5, align 4, !tbaa !11
  %9 = and i32 %8, 2139095040
  %10 = icmp ne i32 %9, 2139095040
  br i1 %10, label %11, label %18

11:                                               ; preds = %2
  %12 = load i32, ptr %5, align 4, !tbaa !11
  %13 = lshr i32 %12, 16
  %14 = and i32 %13, 1
  %15 = add i32 32767, %14
  %16 = load i32, ptr %5, align 4, !tbaa !11
  %17 = add i32 %16, %15
  store i32 %17, ptr %5, align 4, !tbaa !11
  br label %18

18:                                               ; preds = %11, %2
  %19 = load i32, ptr %5, align 4, !tbaa !11
  %20 = lshr i32 %19, 16
  %21 = trunc i32 %20 to i16
  %22 = getelementptr inbounds %"class.sample::BFloat16", ptr %7, i32 0, i32 0
  store i16 %21, ptr %22, align 2, !tbaa !13
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #3 = { 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"float", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!14, !15, i64 0}
!14 = !{!"_ZTSN6sample8BFloat16E", !15, i64 0}
!15 = !{!"short", !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(argmem: write) uwtable
define dso_local void @_ZN6sample8BFloat16C2Ef(ptr nocapture noundef nonnull writeonly align 2 dereferenceable(2) %0, float noundef %1) unnamed_addr #0 align 2 {
  %3 = bitcast float %1 to i32
  %4 = and i32 %3, 2139095040
  %.not = icmp eq i32 %4, 2139095040
  %5 = lshr i32 %3, 16
  %6 = and i32 %5, 1
  %7 = add nuw nsw i32 %6, 32767
  %8 = select i1 %.not, i32 0, i32 %7
  %.0 = add nsw i32 %8, %3
  %9 = lshr i32 %.0, 16
  %10 = trunc nuw i32 %9 to i16
  store i16 %10, ptr %0, align 2, !tbaa !5
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: write) 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 = !{!"_ZTSN6sample8BFloat16E", !7, i64 0}
!7 = !{!"short", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}


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