[Pnet-developers] jit coder problem

[ktreichel]

Hi,

i have found the following code in mscorlib for Hashtable.get_Item:

        .method public virtual hidebysig newslot specialname instance class 
System.Object get_Item(class System.Object key) cil managed 
        {
                // Start of method header: 2849c
                .maxstack  3
                .locals    init (int32,
                            int32)
        ?L284a8:
                ldarg.0
                ldarg.1
                ldloca.s   0
                callvirt   instance int32 
System.Collections.Hashtable::FindSlot(class System.Object, int32 &)
                stloc.1
                ldloc.1
                ldc.i4.m1
                bne.un.s   ?L284b9
                ldnull
                br.s       ?L284ca
        ?L284b9:
                ldarg.0
                ldfld      valuetype System.Collections.Hashtable/HashBucket[] 
System.Collections.Hashtable::table
                ldloc.1
                ldelema    valuetype System.Collections.Hashtable/HashBucket
                ldfld      class System.Object 
System.Collections.Hashtable/HashBucket::value
        ?L284ca:
                ret
        }

My problem with the coder is the branch directly to the ret instruction which 
should return either null or the HashBucket value.

Should we fix this by examining the instruction at the branch target and see if 
it's a ret instruction and do the ret instead of the branch then ?

That's just my first idea how we could handle this issue.

Any other ideas are welcome.

Cheers,

Klaus
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