Repost: RFA [4.1]: improvement to if-conversion and cross-jumping (PR20070)

[Bernd Schmidt]

Joern RENNECKE wrote:
> Bernd Schmidt wrote:
> 
>>  
>> > We can still be called for a PRE_MODIFY / POST_MODIFY.
>>
>> So?  These do not contain SETs or CLOBBERs.  The comment near the MEM 
>> handling seems confused, and I'm not convinced we're doing the right 
>> thing for these RTL expressions.
> 
> 
> 
> Oops, I they way I remembered them they contained a SET.  They actually 
> contain a SET_SRC and a SET_DEST, except that these macros won't allow 
> these codes.
> Could we change them to accept these codes?  Then I can add PRE_MODIFY 
> and POST_MODIFY as additional case labels besides the SET: label.

Not sure this is such a good idea since the "SET_DEST" is actually an 
in-out operand.  I'd rather add them near with code similar to the 
P{RE,OST}_{IN,DE}C cases.


Bernd