[Mesa-dev] GLSL IR & TGSI on-disk shader cache

[Michel Dänzer]

On 14/02/17 04:50 AM, Matt Arsenault wrote:
>> On Feb 6, 2017, at 19:42, Timothy Arceri <tarceri at itsqueeze.com
>> <mailto:tarceri at itsqueeze.com>> wrote:
>>
>> This series does not include the patch that adds cache support
>> to the radeonsi backend, the main reason for this is that llvm
>> currently doesn't allow the version to be queried at runtime
>> (as far as I'm aware) although it seems like other are interested
>> in this feature [1] so I will follow up on that.
> 
> This should not be necessary. Old bitcode is supposed to be forward
> compatible and should be autoupgraded. You should not need to check that
> the runtime version matches.

This isn't enough for the shader cache, since LLVM code changes can
potentially cause different machine code to be generated even for
identical LLVM IR, e.g. a fix for a bug which caused incorrect machine
code to be generated.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer