AMDGPU: Add gfx90c support to code object v2 for backwards compatibility

[t-tye]

llvm/docs/AMDGPUUsage.rst

1363

``AMD:AMDGPU:9:0:12`` ``gfx90c:xnack-``

[kzhuravl]

Address review feedback.

[t-tye]

LGTM

llvm/docs/AMDGPUUsage.rst

``NT_AMD_HSA_METADATA``
   [HSA]_ compatible runtimes (see :ref:`amdgpu-os`). It is required when the
   target triple OS is ``amdhsa`` (see :ref:`amdgpu-target-triples`). See
   :ref:`amdgpu-amdhsa-code-object-metadata-v2` for the syntax of the code object
   metadata string.
 
   .. table:: AMDGPU Code Object V2 Supported Processors and Fixed Target Feature Settings
      :name: amdgpu-elf-note-record-supported_processors-v2-table
 
-     ==================== ==========================
-     Note Record ISA Name Target ID
-     ==================== ==========================
-     ``AMD:AMDGPU:6:0:0`` ``gfx600``
-     ``AMD:AMDGPU:6:0:1`` ``gfx601``
-     ``AMD:AMDGPU:6:0:2`` ``gfx602``
-     ``AMD:AMDGPU:7:0:0`` ``gfx700``
-     ``AMD:AMDGPU:7:0:1`` ``gfx701``
-     ``AMD:AMDGPU:7:0:2`` ``gfx702``
-     ``AMD:AMDGPU:7:0:3`` ``gfx703``
-     ``AMD:AMDGPU:7:0:4`` ``gfx704``
-     ``AMD:AMDGPU:7:0:5`` ``gfx705``
-     ``AMD:AMDGPU:8:0:0`` ``gfx802``
-     ``AMD:AMDGPU:8:0:1`` ``gfx801:xnack+``
-     ``AMD:AMDGPU:8:0:2`` ``gfx802``
-     ``AMD:AMDGPU:8:0:3`` ``gfx803``
-     ``AMD:AMDGPU:8:0:4`` ``gfx803``
-     ``AMD:AMDGPU:8:0:5`` ``gfx805``
-     ``AMD:AMDGPU:8:1:0`` ``gfx810:xnack+``
-     ``AMD:AMDGPU:9:0:0`` ``gfx900:xnack-``
-     ``AMD:AMDGPU:9:0:1`` ``gfx900:xnack+``
-     ``AMD:AMDGPU:9:0:2`` ``gfx902:xnack-``
-     ``AMD:AMDGPU:9:0:3`` ``gfx902:xnack+``
-     ``AMD:AMDGPU:9:0:4`` ``gfx904:xnack-``
-     ``AMD:AMDGPU:9:0:5`` ``gfx904:xnack+``
-     ``AMD:AMDGPU:9:0:6`` ``gfx906:sramecc-:xnack-``
-     ``AMD:AMDGPU:9:0:7`` ``gfx906:sramecc-:xnack+``
-     ==================== ==========================
+     ===================== ==========================
+     Note Record ISA Name  Target ID
+     ===================== ==========================
+     ``AMD:AMDGPU:6:0:0``  ``gfx600``
+     ``AMD:AMDGPU:6:0:1``  ``gfx601``
+     ``AMD:AMDGPU:6:0:2``  ``gfx602``
+     ``AMD:AMDGPU:7:0:0``  ``gfx700``
+     ``AMD:AMDGPU:7:0:1``  ``gfx701``
+     ``AMD:AMDGPU:7:0:2``  ``gfx702``
+     ``AMD:AMDGPU:7:0:3``  ``gfx703``
+     ``AMD:AMDGPU:7:0:4``  ``gfx704``
+     ``AMD:AMDGPU:7:0:5``  ``gfx705``
+     ``AMD:AMDGPU:8:0:0``  ``gfx802``
+     ``AMD:AMDGPU:8:0:1``  ``gfx801:xnack+``
+     ``AMD:AMDGPU:8:0:2``  ``gfx802``
+     ``AMD:AMDGPU:8:0:3``  ``gfx803``
+     ``AMD:AMDGPU:8:0:4``  ``gfx803``
+     ``AMD:AMDGPU:8:0:5``  ``gfx805``
+     ``AMD:AMDGPU:8:1:0``  ``gfx810:xnack+``
+     ``AMD:AMDGPU:9:0:0``  ``gfx900:xnack-``
+     ``AMD:AMDGPU:9:0:1``  ``gfx900:xnack+``
+     ``AMD:AMDGPU:9:0:2``  ``gfx902:xnack-``
+     ``AMD:AMDGPU:9:0:3``  ``gfx902:xnack+``
+     ``AMD:AMDGPU:9:0:4``  ``gfx904:xnack-``
+     ``AMD:AMDGPU:9:0:5``  ``gfx904:xnack+``
+     ``AMD:AMDGPU:9:0:6``  ``gfx906:sramecc-:xnack-``
+     ``AMD:AMDGPU:9:0:7``  ``gfx906:sramecc-:xnack+``
+     ``AMD:AMDGPU:9:0:12`` ``gfx90c:xnack-``
+     ===================== ==========================
 
 .. _amdgpu-note-records-v3-v4:
 
 Code Object V3 to V4 Note Records
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 The AMDGPU backend code object uses the following ELF note record in the
 ``.note`` section when compiling for code object V3 to V4.

llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp

case ELF::ELFABIVERSION_AMDGPU_HSA_V2:
         if (isXnackOnOrAny())
           Processor = "gfx903";
       } else if (Processor == "gfx904") {
         if (isXnackOnOrAny())
           Processor = "gfx905";
       } else if (Processor == "gfx906") {
         if (isXnackOnOrAny())
           Processor = "gfx907";
+      } else if (Processor == "gfx90c") {
+        if (isXnackOnOrAny())
+          report_fatal_error(
+              "AMD GPU code object V2 does not support processor " + Processor +
+              " with XNACK being ON or ANY");
       } else {
         report_fatal_error(
             "AMD GPU code object V2 does not support processor " + Processor);
       }
       break;
     case ELF::ELFABIVERSION_AMDGPU_HSA_V3:
       // xnack.
       if (isXnackOnOrAny())

llvm/test/CodeGen/AMDGPU/tid-code-object-v2-backwards-compatibility.ll

+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx90c -mattr=-xnack --amdhsa-code-object-version=2 < %s 2>&1 | FileCheck --check-prefix=GFX90C-VALID %s
+; RUN: not --crash llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx90c --amdhsa-code-object-version=2 < %s 2>&1 | FileCheck --check-prefix=GFX90C-ERROR %s
+
+; GFX90C-VALID: .hsa_code_object_isa 9,0,12,"AMD","AMDGPU"
+; GFX90C-VALID: .amd_amdgpu_isa "amdgcn-amd-amdhsa--gfx90c"
+; GFX90C-ERROR: LLVM ERROR: AMD GPU code object V2 does not support processor gfx90c with XNACK being ON or ANY