; LLVM IR from aap/librw :: src/base.ll (ZN2rw10strncmp_ciEPKcS1_i)

; 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: nounwind willreturn memory(read)
declare i32 @tolower(i32 noundef) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_ZN2rw10strncmp_ciEPKcS1_i(ptr noundef %0, ptr noundef %1, i32 noundef %2) #2 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i8, align 1
  %9 = alloca i8, align 1
  %10 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 1, ptr %8) #3
  call void @llvm.lifetime.start.p0(i64 1, ptr %9) #3
  br label %11

11:                                               ; preds = %42, %3
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = add nsw i32 %12, -1
  store i32 %13, ptr %7, align 4, !tbaa !9
  %14 = icmp ne i32 %12, 0
  br i1 %14, label %15, label %47

15:                                               ; preds = %11
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = load i8, ptr %16, align 1, !tbaa !11
  %18 = sext i8 %17 to i32
  %19 = call i32 @tolower(i32 noundef %18) #4
  %20 = trunc i32 %19 to i8
  store i8 %20, ptr %8, align 1, !tbaa !11
  %21 = load ptr, ptr %6, align 8, !tbaa !5
  %22 = load i8, ptr %21, align 1, !tbaa !11
  %23 = sext i8 %22 to i32
  %24 = call i32 @tolower(i32 noundef %23) #4
  %25 = trunc i32 %24 to i8
  store i8 %25, ptr %9, align 1, !tbaa !11
  %26 = load i8, ptr %8, align 1, !tbaa !11
  %27 = sext i8 %26 to i32
  %28 = load i8, ptr %9, align 1, !tbaa !11
  %29 = sext i8 %28 to i32
  %30 = icmp ne i32 %27, %29
  br i1 %30, label %31, label %37

31:                                               ; preds = %15
  %32 = load i8, ptr %8, align 1, !tbaa !11
  %33 = sext i8 %32 to i32
  %34 = load i8, ptr %9, align 1, !tbaa !11
  %35 = sext i8 %34 to i32
  %36 = sub nsw i32 %33, %35
  store i32 %36, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %48

37:                                               ; preds = %15
  %38 = load i8, ptr %8, align 1, !tbaa !11
  %39 = sext i8 %38 to i32
  %40 = icmp eq i32 %39, 0
  br i1 %40, label %41, label %42

41:                                               ; preds = %37
  store i32 0, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %48

42:                                               ; preds = %37
  %43 = load ptr, ptr %5, align 8, !tbaa !5
  %44 = getelementptr inbounds i8, ptr %43, i32 1
  store ptr %44, ptr %5, align 8, !tbaa !5
  %45 = load ptr, ptr %6, align 8, !tbaa !5
  %46 = getelementptr inbounds i8, ptr %45, i32 1
  store ptr %46, ptr %6, align 8, !tbaa !5
  br label %11, !llvm.loop !12

47:                                               ; preds = %11
  store i32 0, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %48

48:                                               ; preds = %47, %41, %31
  call void @llvm.lifetime.end.p0(i64 1, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr %8) #3
  %49 = load i32, ptr %4, align 4
  ret i32 %49
}

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 = !{!"int", !7, i64 0}
!11 = !{!7, !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"

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

; Function Attrs: mustprogress nofree nounwind willreturn memory(read) uwtable
define dso_local noundef range(i32 -255, 256) i32 @_ZN2rw10strncmp_ciEPKcS1_i(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i32 noundef %2) local_unnamed_addr #1 {
  %.not18 = icmp eq i32 %2, 0
  br i1 %.not18, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %3, %14
  %.in = phi i32 [ %15, %14 ], [ %2, %3 ]
  %.01020 = phi ptr [ %17, %14 ], [ %0, %3 ]
  %.01219 = phi ptr [ %18, %14 ], [ %1, %3 ]
  %4 = load i8, ptr %.01020, align 1, !tbaa !5
  %5 = sext i8 %4 to i32
  %6 = tail call i32 @tolower(i32 noundef %5) #2
  %7 = load i8, ptr %.01219, align 1, !tbaa !5
  %8 = sext i8 %7 to i32
  %9 = tail call i32 @tolower(i32 noundef %8) #2
  %sext = shl i32 %6, 24
  %10 = ashr exact i32 %sext, 24
  %sext15 = shl i32 %9, 24
  %11 = ashr exact i32 %sext15, 24
  %.not16 = icmp eq i32 %10, %11
  br i1 %.not16, label %14, label %12

12:                                               ; preds = %.lr.ph
  %13 = sub nsw i32 %10, %11
  br label %.loopexit

14:                                               ; preds = %.lr.ph
  %15 = add nsw i32 %.in, -1
  %16 = icmp eq i32 %sext, 0
  %17 = getelementptr inbounds i8, ptr %.01020, i64 1
  %18 = getelementptr inbounds i8, ptr %.01219, i64 1
  %.not = icmp eq i32 %15, 0
  %or.cond = select i1 %16, i1 true, i1 %.not
  br i1 %or.cond, label %.loopexit, label %.lr.ph, !llvm.loop !8

.loopexit:                                        ; preds = %14, %3, %12
  %.0 = phi i32 [ %13, %12 ], [ 0, %3 ], [ 0, %14 ]
  ret i32 %.0
}

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,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass