; LLVM IR from kmilo17pet/qlibs :: qffmath (qFFMath_RSqrt)

; 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.anon = type { [2 x i32] }

@s_values = external hidden constant %union.anon, align 4

; Function Attrs: nounwind uwtable
declare dso_local i32 @qFFMath_FPClassify(float noundef) #0

; 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 nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

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

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare float @llvm.fmuladd.f32(float, float, float) #3

; Function Attrs: nounwind uwtable
define dso_local float @qFFMath_RSqrt(float noundef %0) #0 {
  %2 = alloca float, align 4
  %3 = alloca float, align 4
  %4 = alloca i32, align 4
  %5 = alloca float, align 4
  store float %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  %6 = load float, ptr %2, align 4, !tbaa !5
  %7 = fcmp olt float %6, 0.000000e+00
  br i1 %7, label %8, label %10

8:                                                ; preds = %1
  %9 = load float, ptr getelementptr (i8, ptr @s_values, i64 4), align 4, !tbaa !5
  store float %9, ptr %3, align 4, !tbaa !5
  br label %31

10:                                               ; preds = %1
  %11 = load float, ptr %2, align 4, !tbaa !5
  %12 = call i32 @qFFMath_FPClassify(float noundef %11)
  %13 = icmp eq i32 0, %12
  br i1 %13, label %14, label %16

14:                                               ; preds = %10
  %15 = load float, ptr @s_values, align 4, !tbaa !5
  store float %15, ptr %3, align 4, !tbaa !5
  br label %30

16:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #4
  store i32 0, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  %17 = load float, ptr %2, align 4, !tbaa !5
  %18 = fmul float 5.000000e-01, %17
  store float %18, ptr %5, align 4, !tbaa !5
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %4, ptr align 4 %2, i64 4, i1 false)
  %19 = load i32, ptr %4, align 4, !tbaa !9
  %20 = lshr i32 %19, 1
  %21 = sub i32 1597463174, %20
  store i32 %21, ptr %4, align 4, !tbaa !9
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %2, ptr align 4 %4, i64 4, i1 false)
  %22 = load float, ptr %2, align 4, !tbaa !5
  %23 = load float, ptr %5, align 4, !tbaa !5
  %24 = load float, ptr %2, align 4, !tbaa !5
  %25 = fmul float %23, %24
  %26 = load float, ptr %2, align 4, !tbaa !5
  %27 = fneg float %25
  %28 = call float @llvm.fmuladd.f32(float %27, float %26, float 1.500000e+00)
  %29 = fmul float %22, %28
  store float %29, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #4
  br label %30

30:                                               ; preds = %16, %14
  br label %31

31:                                               ; preds = %30, %8
  %32 = load float, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  ret float %32
}

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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
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 = !{!"float", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !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"

%union.anon = type { [2 x i32] }

@s_values = external hidden local_unnamed_addr constant %union.anon, align 4

; Function Attrs: nounwind uwtable
declare dso_local i32 @qFFMath_FPClassify(float noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare float @llvm.fmuladd.f32(float, float, float) #1

; Function Attrs: nounwind uwtable
define dso_local float @qFFMath_RSqrt(float noundef %0) local_unnamed_addr #0 {
  %2 = fcmp olt float %0, 0.000000e+00
  br i1 %2, label %3, label %5

3:                                                ; preds = %1
  %4 = load float, ptr getelementptr inbounds (i8, ptr @s_values, i64 4), align 4, !tbaa !5
  br label %19

5:                                                ; preds = %1
  %6 = tail call i32 @qFFMath_FPClassify(float noundef %0)
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %8, label %10

8:                                                ; preds = %5
  %9 = load float, ptr @s_values, align 4, !tbaa !5
  br label %19

10:                                               ; preds = %5
  %11 = bitcast float %0 to i32
  %12 = lshr i32 %11, 1
  %13 = sub nsw i32 1597463174, %12
  %14 = bitcast i32 %13 to float
  %15 = fmul float %0, -5.000000e-01
  %16 = fmul float %15, %14
  %17 = tail call float @llvm.fmuladd.f32(float %16, float %14, float 1.500000e+00)
  %18 = fmul float %17, %14
  br label %19

19:                                               ; preds = %8, %10, %3
  %.0 = phi float [ %4, %3 ], [ %9, %8 ], [ %18, %10 ]
  ret float %.0
}

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 = { mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none) }

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


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