[LLVMdev] Disabling emission of jump table info

[Chris Lattner]

On Mar 1, 2010, at 10:52 AM, Richard Osborne wrote:

> On 23/02/10 14:58, Richard Osborne wrote:
>> I've recently changed the XCore target to implement BR_JT as a jump to a
>> series jumps. The jump table entries are expand inline in the function
>> so there is no longer a need to emit jump tables at the end of the
>> function. However the emission of jump tables at the end of a function
>> is done inside the AsmPrinter base class and there seems to be no way of
>> disabling this.
>> 
>> This also seems to effect code produced for ARM Thumb2. Again each jump
>> table is emitted twice - once inline in the code and once at the end of
>> the function. The jump tables at the end of the function are unused.
>> 
>> What would be the preferred way of dealing with this? Should I add a
>> variable to AsmPrinter that can be set by targets to disable this
>> emission at the end?
> The attached patch adds a bool to MCAsmInfo that can be used to disable the emission of jump tables at the end of a function and updates the XCore target to set this. Is this OK to commit?

Hi Richard,

This shouldn't go into MCAsmInfo, it's a "lowering" issue, not a "assembly syntax" issue.  ARM also has inline jump tables, how does it work?

-Chris