; LLVM IR from whoiswelliton/Computer_Engineering_UTFPR-PB :: Embedded_Systems/TIVA Connected TM4C1294XL Projects/01 - lwIP_HTTPServer_on_TIVA (errno)

; 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"

@err_to_errno_table = external hidden constant [17 x i32], align 16

; Function Attrs: nounwind uwtable
define dso_local i32 @err_to_errno(i8 noundef signext %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i8, align 1
  store i8 %0, ptr %3, align 1, !tbaa !5
  %4 = load i8, ptr %3, align 1, !tbaa !5
  %5 = sext i8 %4 to i32
  %6 = icmp sgt i32 %5, 0
  br i1 %6, label %12, label %7

7:                                                ; preds = %1
  %8 = load i8, ptr %3, align 1, !tbaa !5
  %9 = sext i8 %8 to i32
  %10 = sub nsw i32 0, %9
  %11 = icmp sge i32 %10, 17
  br i1 %11, label %12, label %13

12:                                               ; preds = %7, %1
  store i32 5, ptr %2, align 4
  br label %20

13:                                               ; preds = %7
  %14 = load i8, ptr %3, align 1, !tbaa !5
  %15 = sext i8 %14 to i32
  %16 = sub nsw i32 0, %15
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [17 x i32], ptr @err_to_errno_table, i64 0, i64 %17
  %19 = load i32, ptr %18, align 4, !tbaa !8
  store i32 %19, ptr %2, align 4
  br label %20

20:                                               ; preds = %13, %12
  %21 = load i32, ptr %2, align 4
  ret i32 %21
}

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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"int", !6, 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"

@err_to_errno_table = external hidden local_unnamed_addr constant [17 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local i32 @err_to_errno(i8 noundef signext %0) local_unnamed_addr #0 {
  %2 = add i8 %0, -1
  %or.cond = icmp ult i8 %2, -17
  br i1 %or.cond, label %8, label %3

3:                                                ; preds = %1
  %4 = sext i8 %0 to i64
  %5 = sub nsw i64 0, %4
  %6 = getelementptr inbounds [17 x i32], ptr @err_to_errno_table, i64 0, i64 %5
  %7 = load i32, ptr %6, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %1, %3
  %.0 = phi i32 [ %7, %3 ], [ 5, %1 ]
  ret i32 %.0
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass