; LLVM IR from smwikipedia/EmbeddedAndRTOSSamples :: C5.2/kernel (string)

; 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: nounwind uwtable
define dso_local i32 @strcmp(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %28, %2
  %7 = load ptr, ptr %4, align 8, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %7, i32 1
  store ptr %8, ptr %4, align 8, !tbaa !5
  %9 = load i8, ptr %7, align 1, !tbaa !9
  %10 = zext i8 %9 to i32
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = getelementptr inbounds i8, ptr %11, i32 1
  store ptr %12, ptr %5, align 8, !tbaa !5
  %13 = load i8, ptr %11, align 1, !tbaa !9
  %14 = zext i8 %13 to i32
  %15 = icmp eq i32 %10, %14
  br i1 %15, label %16, label %26

16:                                               ; preds = %6
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = load i8, ptr %17, align 1, !tbaa !9
  %19 = zext i8 %18 to i32
  %20 = icmp ne i32 %19, 0
  br i1 %20, label %21, label %26

21:                                               ; preds = %16
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = load i8, ptr %22, align 1, !tbaa !9
  %24 = zext i8 %23 to i32
  %25 = icmp ne i32 %24, 0
  br label %26

26:                                               ; preds = %21, %16, %6
  %27 = phi i1 [ false, %16 ], [ false, %6 ], [ %25, %21 ]
  br i1 %27, label %28, label %29

28:                                               ; preds = %26
  br label %6, !llvm.loop !10

29:                                               ; preds = %26
  %30 = load ptr, ptr %4, align 8, !tbaa !5
  %31 = load i8, ptr %30, align 1, !tbaa !9
  %32 = zext i8 %31 to i32
  %33 = icmp eq i32 %32, 0
  br i1 %33, label %34, label %40

34:                                               ; preds = %29
  %35 = load ptr, ptr %5, align 8, !tbaa !5
  %36 = load i8, ptr %35, align 1, !tbaa !9
  %37 = zext i8 %36 to i32
  %38 = icmp eq i32 %37, 0
  br i1 %38, label %39, label %40

39:                                               ; preds = %34
  store i32 0, ptr %3, align 4
  br label %41

40:                                               ; preds = %34, %29
  store i32 1, ptr %3, align 4
  br label %41

41:                                               ; preds = %40, %39
  %42 = load i32, ptr %3, align 4
  ret i32 %42
}

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" }

!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 = distinct !{!10, !11}
!11 = !{!"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: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local range(i32 0, 2) i32 @strcmp(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %.pre = load i8, ptr %0, align 1, !tbaa !5
  %.pre20 = load i8, ptr %1, align 1, !tbaa !5
  br label %3

3:                                                ; preds = %11, %2
  %4 = phi i8 [ %.pre20, %2 ], [ %12, %11 ]
  %5 = phi i8 [ %.pre, %2 ], [ %9, %11 ]
  %.06 = phi ptr [ %0, %2 ], [ %6, %11 ]
  %.0 = phi ptr [ %1, %2 ], [ %7, %11 ]
  %6 = getelementptr inbounds i8, ptr %.06, i64 1
  %7 = getelementptr inbounds i8, ptr %.0, i64 1
  %8 = icmp eq i8 %5, %4
  %9 = load i8, ptr %6, align 1, !tbaa !5
  %.not = icmp eq i8 %9, 0
  br i1 %8, label %10, label %.critedge

10:                                               ; preds = %3
  br i1 %.not, label %.critedge.thread, label %11

11:                                               ; preds = %10
  %12 = load i8, ptr %7, align 1, !tbaa !5
  %.not8 = icmp eq i8 %12, 0
  br i1 %.not8, label %.critedge.thread9, label %3, !llvm.loop !8

.critedge:                                        ; preds = %3
  br i1 %.not, label %.critedge.thread, label %.critedge.thread9

.critedge.thread:                                 ; preds = %10, %.critedge
  %13 = load i8, ptr %7, align 1, !tbaa !5
  %14 = icmp eq i8 %13, 0
  br i1 %14, label %15, label %.critedge.thread9

.critedge.thread9:                                ; preds = %11, %.critedge.thread, %.critedge
  br label %15

15:                                               ; preds = %.critedge.thread, %.critedge.thread9
  %.07 = phi i32 [ 1, %.critedge.thread9 ], [ 0, %.critedge.thread ]
  ret i32 %.07
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,IPSCCPPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass