; LLVM IR from tleonhardt/practical_cryptography_engineering :: mbedtls (ssl_ciphersuites)

; 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.mbedtls_ssl_ciphersuite_t = type { i32, ptr, i32, i32, i32, i32, i32, i32, i32, i8 }

; Function Attrs: nounwind uwtable
define dso_local i32 @mbedtls_ssl_get_ciphersuite_sig_alg(ptr noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %5 = getelementptr inbounds %struct.mbedtls_ssl_ciphersuite_t, ptr %4, i32 0, i32 4
  %6 = load i32, ptr %5, align 8, !tbaa !9
  switch i32 %6, label %9 [
    i32 1, label %7
    i32 2, label %7
    i32 3, label %7
    i32 4, label %8
  ]

7:                                                ; preds = %1, %1, %1
  store i32 1, ptr %2, align 4
  br label %10

8:                                                ; preds = %1
  store i32 4, ptr %2, align 4
  br label %10

9:                                                ; preds = %1
  store i32 0, ptr %2, align 4
  br label %10

10:                                               ; preds = %9, %8, %7
  %11 = load i32, ptr %2, align 4
  ret i32 %11
}

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 = !{!10, !11, i64 24}
!10 = !{!"mbedtls_ssl_ciphersuite_t", !11, i64 0, !6, i64 8, !11, i64 16, !11, i64 20, !11, i64 24, !11, i64 28, !11, i64 32, !11, i64 36, !11, i64 40, !7, i64 44}
!11 = !{!"int", !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"

@switch.table.mbedtls_ssl_get_ciphersuite_sig_alg = private unnamed_addr constant [4 x i32] [i32 1, i32 1, i32 1, i32 4], align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local range(i32 0, 5) i32 @mbedtls_ssl_get_ciphersuite_sig_alg(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 24
  %3 = load i32, ptr %2, align 8, !tbaa !5
  %switch.tableidx = add i32 %3, -1
  %4 = icmp ult i32 %switch.tableidx, 4
  br i1 %4, label %switch.lookup, label %6

switch.lookup:                                    ; preds = %1
  %5 = zext nneg i32 %switch.tableidx to i64
  %switch.gep = getelementptr inbounds [4 x i32], ptr @switch.table.mbedtls_ssl_get_ciphersuite_sig_alg, i64 0, i64 %5
  %switch.load = load i32, ptr %switch.gep, align 4
  br label %6

6:                                                ; preds = %1, %switch.lookup
  %.0 = phi i32 [ %switch.load, %switch.lookup ], [ 0, %1 ]
  ret i32 %.0
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: 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" }

!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, !7, i64 24}
!6 = !{!"mbedtls_ssl_ciphersuite_t", !7, i64 0, !10, i64 8, !7, i64 16, !7, i64 20, !7, i64 24, !7, i64 28, !7, i64 32, !7, i64 36, !7, i64 40, !8, i64 44}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}


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