; LLVM IR from BrunoLevy/learn-fpga :: LiteX/software/Doom/mc1-doom/src (r_data)

; 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.texture_t = type { [8 x i8], i16, i16, i16, [1 x %struct.texpatch_t] }
%struct.texpatch_t = type { i32, i32, i32 }

@textures = external dso_local global ptr, align 8
@numtextures = external dso_local global i32, align 4

; 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: nounwind uwtable
define dso_local i32 @R_CheckTextureNumForName(ptr noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = getelementptr inbounds i8, ptr %6, i64 0
  %8 = load i8, ptr %7, align 1, !tbaa !9
  %9 = sext i8 %8 to i32
  %10 = icmp eq i32 %9, 45
  br i1 %10, label %11, label %12

11:                                               ; preds = %1
  store i32 0, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %35

12:                                               ; preds = %1
  store i32 0, ptr %4, align 4, !tbaa !10
  br label %13

13:                                               ; preds = %31, %12
  %14 = load i32, ptr %4, align 4, !tbaa !10
  %15 = load i32, ptr @numtextures, align 4, !tbaa !10
  %16 = icmp slt i32 %14, %15
  br i1 %16, label %17, label %34

17:                                               ; preds = %13
  %18 = load ptr, ptr @textures, align 8, !tbaa !5
  %19 = load i32, ptr %4, align 4, !tbaa !10
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds ptr, ptr %18, i64 %20
  %22 = load ptr, ptr %21, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.texture_t, ptr %22, i32 0, i32 0
  %24 = getelementptr inbounds [8 x i8], ptr %23, i64 0, i64 0
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = call i32 @M_strncmpi(ptr noundef %24, ptr noundef %25, i64 noundef 8)
  %27 = icmp ne i32 %26, 0
  br i1 %27, label %30, label %28

28:                                               ; preds = %17
  %29 = load i32, ptr %4, align 4, !tbaa !10
  store i32 %29, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %35

30:                                               ; preds = %17
  br label %31

31:                                               ; preds = %30
  %32 = load i32, ptr %4, align 4, !tbaa !10
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %4, align 4, !tbaa !10
  br label %13, !llvm.loop !12

34:                                               ; preds = %13
  store i32 -1, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %35

35:                                               ; preds = %34, %28, %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  %36 = load i32, ptr %2, align 4
  ret i32 %36
}

declare i32 @M_strncmpi(ptr noundef, ptr noundef, i64 noundef) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = { 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/C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = !{!11, !11, i64 0}
!11 = !{!"int", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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"

@textures = external dso_local local_unnamed_addr global ptr, align 8
@numtextures = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: nounwind uwtable
define dso_local i32 @R_CheckTextureNumForName(ptr noundef %0) local_unnamed_addr #0 {
  %2 = load i8, ptr %0, align 1, !tbaa !5
  %3 = icmp eq i8 %2, 45
  br i1 %3, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %1
  %4 = load i32, ptr @numtextures, align 4, !tbaa !8
  %5 = icmp sgt i32 %4, 0
  br i1 %5, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %.preheader, %10
  %indvars.iv = phi i64 [ %indvars.iv.next, %10 ], [ 0, %.preheader ]
  %6 = load ptr, ptr @textures, align 8, !tbaa !10
  %7 = getelementptr inbounds ptr, ptr %6, i64 %indvars.iv
  %8 = load ptr, ptr %7, align 8, !tbaa !10
  %9 = tail call i32 @M_strncmpi(ptr noundef %8, ptr noundef nonnull %0, i64 noundef 8) #2
  %.not = icmp eq i32 %9, 0
  br i1 %.not, label %.loopexit.loopexit.split.loop.exit11, label %10

10:                                               ; preds = %.lr.ph
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %11 = load i32, ptr @numtextures, align 4, !tbaa !8
  %12 = sext i32 %11 to i64
  %13 = icmp slt i64 %indvars.iv.next, %12
  br i1 %13, label %.lr.ph, label %.loopexit, !llvm.loop !12

.loopexit.loopexit.split.loop.exit11:             ; preds = %.lr.ph
  %14 = trunc nuw nsw i64 %indvars.iv to i32
  br label %.loopexit

.loopexit:                                        ; preds = %10, %.loopexit.loopexit.split.loop.exit11, %.preheader, %1
  %.06 = phi i32 [ 0, %1 ], [ -1, %.preheader ], [ %14, %.loopexit.loopexit.split.loop.exit11 ], [ -1, %10 ]
  ret i32 %.06
}

declare i32 @M_strncmpi(ptr noundef, ptr noundef, 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)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"int", !6, i64 0}
!10 = !{!11, !11, i64 0}
!11 = !{!"any pointer", !6, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass