; LLVM IR from JessonYue/LeetCodeLearning :: Array/yangxin/第五周练习6_28-7_4/elf解析 (elf)

; 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.Elf64_Ehdr = type { [16 x i8], i16, i16, i32, i64, i64, i64, i32, i16, i16, i16, i16, i16, i16 }

@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [23 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [24 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [24 x i8], align 1

declare i32 @printf(ptr noundef, ...) #0

; Function Attrs: nounwind uwtable
define dso_local void @printEI_CLASS(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %4 = getelementptr inbounds %struct.Elf64_Ehdr, ptr %3, i32 0, i32 0
  %5 = getelementptr inbounds [16 x i8], ptr %4, i64 0, i64 4
  %6 = load i8, ptr %5, align 4, !tbaa !9
  %7 = zext i8 %6 to i32
  switch i32 %7, label %14 [
    i32 0, label %8
    i32 1, label %10
    i32 2, label %12
  ]

8:                                                ; preds = %1
  %9 = call i32 (ptr, ...) @printf(ptr noundef @.str.2)
  br label %14

10:                                               ; preds = %1
  %11 = call i32 (ptr, ...) @printf(ptr noundef @.str.3)
  br label %14

12:                                               ; preds = %1
  %13 = call i32 (ptr, ...) @printf(ptr noundef @.str.4)
  br label %14

14:                                               ; preds = %12, %10, %8, %1
  %15 = call i32 (ptr, ...) @printf(ptr noundef @.str.1)
  ret void
}

attributes #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 = { 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}


; 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"

@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [23 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [24 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [24 x i8], align 1
@switch.table.printEI_CLASS = private unnamed_addr constant [3 x ptr] [ptr @.str.2, ptr @.str.3, ptr @.str.4], align 8

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #0

; Function Attrs: nofree nounwind uwtable
define dso_local void @printEI_CLASS(ptr nocapture noundef readonly %0) local_unnamed_addr #1 {
  %2 = getelementptr inbounds i8, ptr %0, i64 4
  %3 = load i8, ptr %2, align 4, !tbaa !5
  %4 = icmp ult i8 %3, 3
  br i1 %4, label %switch.lookup, label %7

switch.lookup:                                    ; preds = %1
  %5 = zext nneg i8 %3 to i64
  %switch.gep = getelementptr inbounds [3 x ptr], ptr @switch.table.printEI_CLASS, i64 0, i64 %5
  %switch.load = load ptr, ptr %switch.gep, align 8
  %6 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) %switch.load)
  br label %7

7:                                                ; preds = %1, %switch.lookup
  %8 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1)
  ret void
}

attributes #0 = { nofree nounwind "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 = { nofree 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass