[AMDGPU][MC][GFX9] New SMEM format features are not supported

[dpreobra]

Bugzilla Link	39304
Version	trunk
OS	Windows NT
CC	@atamazov,@arsenm

Extended Description

Current implementation does not support new GFX9 SMEM format features including:

• new NV bit
• new SOE bit
• new SOFFSET field.

[kosarev]

https://reviews.llvm.org/D126388 adds the support for GFX9 SMEM base+soffset+offset stores and thus completes resolving the soffset-related part of the ticket.

[dpreobra]

The SOFFSET/SOE issue with loads and stores has been resolved. But the following tests are still failing:

s_atc_probe 0x0, s[4:5], s7 offset:0x12345
s_atomic_add s5, s[2:3], s7 offset:0x12345
s_buffer_atomic_add s5, s[4:7], s7 offset:0x12345
s_dcache_discard s[2:3], s7 offset:0x12345

[kosarev]

Right, I didn't realise there are more SMEMs with immediate offsets. Will take care of these. Thanks.

[kosarev]

The soffset and soffset_en fields are now supported, if I don't miss anything.

[dpreobra]

I confirm that all tests for GFX9+ SMEM addressing modes have passed.

[jayfoad]

Thank you for fixing (and testing) this!