; LLVM IR from gem5/gem5 :: ext/softfloat (ui64_to_extF80)

; 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"

%struct.extFloat80M = type { i64, i16 }
%union.anon = type { %struct.extFloat80M }

; Function Attrs: nounwind uwtable
define dso_local { i64, i16 } @ui64_to_extF80(i64 noundef %0) #0 {
  %2 = alloca %struct.extFloat80M, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i8, align 1
  %6 = alloca %union.anon, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #4
  call void @llvm.lifetime.start.p0(i64 1, ptr %5) #4
  call void @llvm.lifetime.start.p0(i64 16, ptr %6) #4
  store i64 0, ptr %4, align 8, !tbaa !5
  %7 = load i64, ptr %3, align 8, !tbaa !5
  %8 = icmp ne i64 %7, 0
  br i1 %8, label %9, label %21

9:                                                ; preds = %1
  %10 = load i64, ptr %3, align 8, !tbaa !5
  %11 = call zeroext i8 @softfloat_countLeadingZeros64(i64 noundef %10)
  store i8 %11, ptr %5, align 1, !tbaa !9
  %12 = load i8, ptr %5, align 1, !tbaa !9
  %13 = sext i8 %12 to i32
  %14 = sub nsw i32 16446, %13
  %15 = sext i32 %14 to i64
  store i64 %15, ptr %4, align 8, !tbaa !5
  %16 = load i8, ptr %5, align 1, !tbaa !9
  %17 = sext i8 %16 to i32
  %18 = load i64, ptr %3, align 8, !tbaa !5
  %19 = zext i32 %17 to i64
  %20 = shl i64 %18, %19
  store i64 %20, ptr %3, align 8, !tbaa !5
  br label %21

21:                                               ; preds = %9, %1
  %22 = load i64, ptr %4, align 8, !tbaa !5
  %23 = trunc i64 %22 to i16
  %24 = getelementptr inbounds %struct.extFloat80M, ptr %6, i32 0, i32 1
  store i16 %23, ptr %24, align 8, !tbaa !9
  %25 = load i64, ptr %3, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.extFloat80M, ptr %6, i32 0, i32 0
  store i64 %25, ptr %26, align 8, !tbaa !9
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %2, ptr align 8 %6, i64 16, i1 false), !tbaa.struct !10
  call void @llvm.lifetime.end.p0(i64 16, ptr %6) #4
  call void @llvm.lifetime.end.p0(i64 1, ptr %5) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #4
  %27 = load { i64, i16 }, ptr %2, align 8
  ret { i64, i16 } %27
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare zeroext i8 @softfloat_countLeadingZeros64(i64 noundef) #2

; 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) #3

; 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 = { "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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { 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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = !{i64 0, i64 8, !5, i64 8, i64 2, !11}
!11 = !{!12, !12, i64 0}
!12 = !{!"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: nounwind uwtable
define dso_local { i64, i16 } @ui64_to_extF80(i64 noundef %0) local_unnamed_addr #0 {
  %.not = icmp eq i64 %0, 0
  br i1 %.not, label %9, label %2

2:                                                ; preds = %1
  %3 = tail call zeroext i8 @softfloat_countLeadingZeros64(i64 noundef %0) #2
  %4 = sext i8 %3 to i64
  %5 = and i64 %4, 4294967295
  %6 = shl i64 %0, %5
  %7 = sext i8 %3 to i16
  %8 = sub nsw i16 16446, %7
  br label %9

9:                                                ; preds = %2, %1
  %.09 = phi i16 [ %8, %2 ], [ 0, %1 ]
  %.0 = phi i64 [ %6, %2 ], [ 0, %1 ]
  %.fca.0.insert = insertvalue { i64, i16 } poison, i64 %.0, 0
  %.fca.1.insert = insertvalue { i64, i16 } %.fca.0.insert, i16 %.09, 1
  ret { i64, i16 } %.fca.1.insert
}

declare zeroext i8 @softfloat_countLeadingZeros64(i64 noundef) local_unnamed_addr #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 = { "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)"}


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