Re: [PATCH] Fix MIPS jalr(.hb) register checking

[David Daney <ddaney at caviumnetworks dot com>]

Fu, Chao-Ying wrote:
[...]
>  		      if (regno == lastregno)
>  		        {
> -			  insn_error = _("source and destinationations must be different");
> +			  insn_error = _("source and destination must be different");
>  			  continue;
>  		        }

I question why we are doing this check in the first place.

The ISA manual says not to place the destination in the same register as 
the source because if you trap in the delay slot you want to be able to 
re-try the instruction.

If the programmer *knows* that there will not be a trap, then they could 
 use the same register.  I don't think the assembler should prevent this.

David Daney