; LLVM IR from gem5/gem5 :: ext/softfloat (s_countLeadingZeros16)

; 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"

@softfloat_countLeadingZeros8 = external constant [256 x i8], align 16

; Function Attrs: nounwind uwtable
define dso_local zeroext i8 @softfloat_countLeadingZeros16(i16 noundef zeroext %0) #0 {
  %2 = alloca i16, align 2
  %3 = alloca i8, align 1
  store i16 %0, ptr %2, align 2, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr %3) #2
  store i8 8, ptr %3, align 1, !tbaa !9
  %4 = load i16, ptr %2, align 2, !tbaa !5
  %5 = zext i16 %4 to i32
  %6 = icmp sle i32 256, %5
  br i1 %6, label %7, label %12

7:                                                ; preds = %1
  store i8 0, ptr %3, align 1, !tbaa !9
  %8 = load i16, ptr %2, align 2, !tbaa !5
  %9 = zext i16 %8 to i32
  %10 = ashr i32 %9, 8
  %11 = trunc i32 %10 to i16
  store i16 %11, ptr %2, align 2, !tbaa !5
  br label %12

12:                                               ; preds = %7, %1
  %13 = load i16, ptr %2, align 2, !tbaa !5
  %14 = zext i16 %13 to i64
  %15 = getelementptr inbounds [256 x i8], ptr @softfloat_countLeadingZeros8, i64 0, i64 %14
  %16 = load i8, ptr %15, align 1, !tbaa !9
  %17 = zext i8 %16 to i32
  %18 = load i8, ptr %3, align 1, !tbaa !9
  %19 = zext i8 %18 to i32
  %20 = add nsw i32 %19, %17
  %21 = trunc i32 %20 to i8
  store i8 %21, ptr %3, align 1, !tbaa !9
  %22 = load i8, ptr %3, align 1, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 1, ptr %3) #2
  ret i8 %22
}

; 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 = !{!"short", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!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"

@softfloat_countLeadingZeros8 = external local_unnamed_addr constant [256 x i8], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local zeroext i8 @softfloat_countLeadingZeros16(i16 noundef zeroext %0) local_unnamed_addr #0 {
  %2 = icmp ugt i16 %0, 255
  %3 = lshr i16 %0, 8
  %spec.select = select i1 %2, i16 %3, i16 %0
  %spec.select7 = select i1 %2, i8 0, i8 8
  %4 = zext nneg i16 %spec.select to i64
  %5 = getelementptr inbounds [256 x i8], ptr @softfloat_countLeadingZeros8, i64 0, i64 %4
  %6 = load i8, ptr %5, align 1, !tbaa !5
  %7 = add i8 %6, %spec.select7
  ret i8 %7
}

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)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}


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