; LLVM IR from theolundqvist/parallax-voxel-ray-marcher :: src/external/Dear ImGui/imgui.ll (Z10ImStrnicmpPKcS0_m)

; 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"

; 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 willreturn memory(read)
declare i32 @toupper(i32 noundef) #1

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z10ImStrnicmpPKcS0_m(ptr noundef %0, ptr noundef %1, i64 noundef %2) #2 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i64 %2, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  store i32 0, ptr %7, align 4, !tbaa !11
  br label %8

8:                                                ; preds = %28, %3
  %9 = load i64, ptr %6, align 8, !tbaa !9
  %10 = icmp ugt i64 %9, 0
  br i1 %10, label %11, label %26

11:                                               ; preds = %8
  %12 = load ptr, ptr %5, align 8, !tbaa !5
  %13 = load i8, ptr %12, align 1, !tbaa !13
  %14 = sext i8 %13 to i32
  %15 = call i32 @toupper(i32 noundef %14) #4
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = load i8, ptr %16, align 1, !tbaa !13
  %18 = sext i8 %17 to i32
  %19 = call i32 @toupper(i32 noundef %18) #4
  %20 = sub nsw i32 %15, %19
  store i32 %20, ptr %7, align 4, !tbaa !11
  %21 = icmp eq i32 %20, 0
  br i1 %21, label %22, label %26

22:                                               ; preds = %11
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = load i8, ptr %23, align 1, !tbaa !13
  %25 = icmp ne i8 %24, 0
  br label %26

26:                                               ; preds = %22, %11, %8
  %27 = phi i1 [ false, %11 ], [ false, %8 ], [ %25, %22 ]
  br i1 %27, label %28, label %35

28:                                               ; preds = %26
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = getelementptr inbounds i8, ptr %29, i32 1
  store ptr %30, ptr %4, align 8, !tbaa !5
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = getelementptr inbounds i8, ptr %31, i32 1
  store ptr %32, ptr %5, align 8, !tbaa !5
  %33 = load i64, ptr %6, align 8, !tbaa !9
  %34 = add i64 %33, -1
  store i64 %34, ptr %6, align 8, !tbaa !9
  br label %8, !llvm.loop !14

35:                                               ; preds = %26
  %36 = load i32, ptr %7, align 4, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  ret i32 %36
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind willreturn memory(read) "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 = { 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 }
attributes #4 = { nounwind willreturn memory(read) }

!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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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"

; Function Attrs: mustprogress nofree nounwind willreturn memory(read)
declare i32 @toupper(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nofree nounwind willreturn memory(read) uwtable
define dso_local noundef i32 @_Z10ImStrnicmpPKcS0_m(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i64 noundef %2) local_unnamed_addr #1 {
  %.not13 = icmp eq i64 %2, 0
  br i1 %.not13, label %.critedge, label %.lr.ph

.lr.ph:                                           ; preds = %3, %12
  %.0716 = phi i64 [ %15, %12 ], [ %2, %3 ]
  %.0815 = phi ptr [ %14, %12 ], [ %1, %3 ]
  %.0914 = phi ptr [ %13, %12 ], [ %0, %3 ]
  %4 = load i8, ptr %.0815, align 1, !tbaa !5
  %5 = sext i8 %4 to i32
  %6 = tail call i32 @toupper(i32 noundef %5) #2
  %7 = load i8, ptr %.0914, align 1, !tbaa !5
  %8 = sext i8 %7 to i32
  %9 = tail call i32 @toupper(i32 noundef %8) #2
  %10 = sub nsw i32 %6, %9
  %11 = icmp eq i32 %10, 0
  br i1 %11, label %12, label %.critedge

12:                                               ; preds = %.lr.ph
  %.not12 = icmp eq i8 %7, 0
  %13 = getelementptr inbounds i8, ptr %.0914, i64 1
  %14 = getelementptr inbounds i8, ptr %.0815, i64 1
  %15 = add i64 %.0716, -1
  %.not = icmp eq i64 %15, 0
  %or.cond = select i1 %.not12, i1 true, i1 %.not
  br i1 %or.cond, label %.critedge, label %.lr.ph, !llvm.loop !8

.critedge:                                        ; preds = %12, %.lr.ph, %3
  %.1 = phi i32 [ 0, %3 ], [ %10, %.lr.ph ], [ 0, %12 ]
  ret i32 %.1
}

attributes #0 = { mustprogress nofree nounwind willreturn memory(read) "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 nofree nounwind willreturn memory(read) 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 = { nounwind willreturn memory(read) }

!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++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass