; LLVM IR from BrunoLevy/learn-fpga :: LiteX/software/Tagl/Rotate/gobj.ll (ZN13GraphicObject9GammaRampEf)

; 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"

@_ZN13GraphicObject11_gamma_rampE = external dso_local global [1024 x i32], align 16

; 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 uwtable
define dso_local void @_ZN13GraphicObject9GammaRampEf(float noundef %0) #1 align 2 {
  %2 = alloca float, align 4
  %3 = alloca i32, align 4
  store float %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %4

4:                                                ; preds = %23, %1
  %5 = load i32, ptr %3, align 4, !tbaa !9
  %6 = icmp slt i32 %5, 1024
  br i1 %6, label %7, label %26

7:                                                ; preds = %4
  %8 = load i32, ptr %3, align 4, !tbaa !9
  %9 = shl i32 %8, 8
  %10 = sitofp i32 %9 to float
  %11 = fneg float %10
  %12 = load float, ptr %2, align 4, !tbaa !5
  %13 = fmul float 1.638400e+04, %12
  %14 = fdiv float %11, %13
  %15 = call noundef float @_ZSt3expf(float noundef %14)
  %16 = fpext float %15 to double
  %17 = fsub double 1.000000e+00, %16
  %18 = fmul double 1.638400e+04, %17
  %19 = fptosi double %18 to i32
  %20 = load i32, ptr %3, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [1024 x i32], ptr @_ZN13GraphicObject11_gamma_rampE, i64 0, i64 %21
  store i32 %19, ptr %22, align 4, !tbaa !9
  br label %23

23:                                               ; preds = %7
  %24 = load i32, ptr %3, align 4, !tbaa !9
  %25 = add nsw i32 %24, 1
  store i32 %25, ptr %3, align 4, !tbaa !9
  br label %4, !llvm.loop !11

26:                                               ; preds = %4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  ret void
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef float @_ZSt3expf(float noundef) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 = { inlinehint 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 = !{!"float", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; 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"

@_ZN13GraphicObject11_gamma_rampE = external dso_local local_unnamed_addr global [1024 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN13GraphicObject9GammaRampEf(float noundef %0) local_unnamed_addr #0 align 2 {
  %2 = fmul float %0, 1.638400e+04
  br label %3

3:                                                ; preds = %1, %3
  %indvars.iv = phi i64 [ 0, %1 ], [ %indvars.iv.next, %3 ]
  %indvars.iv.tr = trunc i64 %indvars.iv to i32
  %4 = shl i32 %indvars.iv.tr, 8
  %5 = uitofp nneg i32 %4 to float
  %6 = fneg float %5
  %7 = fdiv float %6, %2
  %8 = tail call noundef float @_ZSt3expf(float noundef %7)
  %9 = fpext float %8 to double
  %10 = fsub double 1.000000e+00, %9
  %11 = fmul double %10, 1.638400e+04
  %12 = fptosi double %11 to i32
  %13 = getelementptr inbounds [1024 x i32], ptr @_ZN13GraphicObject11_gamma_rampE, i64 0, i64 %indvars.iv
  store i32 %12, ptr %13, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, 1024
  br i1 %exitcond.not, label %14, label %3, !llvm.loop !9

14:                                               ; preds = %3
  ret void
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef float @_ZSt3expf(float noundef) local_unnamed_addr #1

attributes #0 = { 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 #1 = { inlinehint 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" }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LICMPass,LoopRotatePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass