[LLVMdev] BasicTansformInfoPass

reed kotler rkotler at mips.com
Fri Mar 22 14:46:37 PDT 2013

On 03/22/2013 02:33 PM, Stephen Checkoway wrote:
> On Mar 22, 2013, at 5:06 PM, reed kotler <rkotler at mips.com> wrote:
>> Does anyone know if this really needs to be an immutable pass?
> [snip]
> I don't know the answers to your questions, but ARM allows mixed ARM and THUMB instructions using the blx instruction. Can you not do something similar to what the ARM backend does to handle it?
This is mimicking functionality that exists with gcc for mips16 and mips32.

It's very involved and is needed for various things; including some 
aspects of mips16 hard float when you can mix that code with mips 32 code.

There are other ways to intermix mips16 and mips32 but this particular 
scheme requires that you be able to decide on a per function basis 
whether you want to generate mips16 or mips32 code.

I'm working through the problem little by little but I don't know in 
detail the non target dependent parts of the compiler that are relevant 


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