; LLVM IR from kparc/ksimple :: a.ll (a)

; 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"

@WS = external hidden global i64, align 8

; Function Attrs: nounwind uwtable
define dso_local i64 @_a(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i32, align 4
  store i64 %0, ptr %2, align 8, !tbaa !5
  %4 = load i64, ptr %2, align 8, !tbaa !5
  %5 = inttoptr i64 %4 to ptr
  %6 = getelementptr inbounds i8, ptr %5, i64 -1
  %7 = load i8, ptr %6, align 1, !tbaa !9
  %8 = zext i8 %7 to i64
  %9 = load i64, ptr @WS, align 8, !tbaa !5
  %10 = sub i64 %9, %8
  store i64 %10, ptr @WS, align 8, !tbaa !5
  %11 = load i64, ptr %2, align 8, !tbaa !5
  %12 = inttoptr i64 %11 to ptr
  %13 = getelementptr inbounds i8, ptr %12, i64 -2
  call void @free(ptr noundef %13) #2
  store i32 0, ptr %3, align 4, !tbaa !10
  %14 = load i32, ptr %3, align 4, !tbaa !10
  %15 = sext i32 %14 to i64
  ret i64 %15
}

; Function Attrs: nounwind
declare void @free(ptr noundef) #1

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" }
attributes #1 = { 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 #2 = { nounwind }

!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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = !{!11, !11, i64 0}
!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"

@WS = external hidden local_unnamed_addr global i64, align 8

; Function Attrs: mustprogress nounwind willreturn uwtable
define dso_local noundef i64 @_a(i64 noundef %0) local_unnamed_addr #0 {
  %2 = inttoptr i64 %0 to ptr
  %3 = getelementptr inbounds i8, ptr %2, i64 -1
  %4 = load i8, ptr %3, align 1, !tbaa !5
  %5 = zext i8 %4 to i64
  %6 = load i64, ptr @WS, align 8, !tbaa !8
  %7 = sub i64 %6, %5
  store i64 %7, ptr @WS, align 8, !tbaa !8
  %8 = getelementptr inbounds i8, ptr %2, i64 -2
  tail call void @free(ptr noundef nonnull %8) #2
  ret i64 0
}

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #1

attributes #0 = { mustprogress nounwind willreturn 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 #1 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite) "alloc-family"="malloc" "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 }

!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 = !{!"long", !6, i64 0}


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