AMDGPU: Make sram-ecc off by default for Vega20

[rampitec]

LGTM

docs/AMDGPUUsage.rst

``gfx902``                  ``amdgcn``   APU   - xnack            - Ryzen 3 2200G
                                                       [on]             - Ryzen 5 2400G
      ``gfx904``                  ``amdgcn``   dGPU  - xnack            *TBA*
                                                       [off]
                                                                        .. TODO
                                                                           Add product
                                                                           names.
      ``gfx906``                  ``amdgcn``   dGPU  - xnack            - Radeon Instinct MI50
                                                       [off]            - Radeon Instinct MI60
-                                                      sram-ecc
-                                                      [on]
      ``gfx909``                  ``amdgcn``   APU   - xnack            *TBA* (Raven Ridge 2)
                                                       [on]
                                                                        .. TODO
                                                                           Add product
                                                                           names.
      =========== =============== ============ ===== ========== ======= ======================
 
 .. _amdgpu-target-features:

lib/Target/AMDGPU/AMDGPU.td

 def FeatureISAVersion9_0_6 : FeatureSet<
   [FeatureGFX9,
    HalfRate64Ops,
    FeatureFmaMixInsts,
    FeatureLDSBankCount32,
    FeatureDLInsts,
    FeatureDot1Insts,
    FeatureDot2Insts,
-   FeatureSRAMECC,
    FeatureCodeObjectV3]>;
 
 def FeatureISAVersion9_0_9 : FeatureSet<
   [FeatureGFX9,
    FeatureMadMixInsts,
    FeatureLDSBankCount32,
    FeatureXNACK,
    FeatureCodeObjectV3]>;

test/CodeGen/AMDGPU/directive-amdgcn-target.ll

 ; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx902 -mattr=+code-object-v3 < %s | FileCheck --check-prefixes=GFX902 %s
 ; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx904 -mattr=+code-object-v3 < %s | FileCheck --check-prefixes=GFX904 %s
 ; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx906 -mattr=+code-object-v3 < %s | FileCheck --check-prefixes=GFX906 %s
 
 ; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -mattr=+code-object-v3,+xnack < %s | FileCheck --check-prefixes=XNACK-GFX900 %s
 ; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx902 -mattr=+code-object-v3,-xnack < %s | FileCheck --check-prefixes=NO-XNACK-GFX902 %s
 
 ; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx904 -mattr=+code-object-v3,+sram-ecc < %s | FileCheck --check-prefixes=SRAM-ECC-GFX904 %s
-; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx906 -mattr=+code-object-v3,-sram-ecc < %s | FileCheck --check-prefixes=NO-SRAM-ECC-GFX906 %s
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx906 -mattr=+code-object-v3,+sram-ecc < %s | FileCheck --check-prefixes=SRAM-ECC-GFX906 %s
 
 ; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx904 -mattr=+code-object-v3,+sram-ecc,+xnack < %s | FileCheck --check-prefixes=SRAM-ECC-XNACK-GFX904 %s
-; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx906 -mattr=+code-object-v3,+xnack < %s | FileCheck --check-prefixes=XNACK-GFX906 %s
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx906 -mattr=+code-object-v3,+sram-ecc,+xnack < %s | FileCheck --check-prefixes=SRAM-ECC-XNACK-GFX906 %s
 
 ; GFX600: .amdgcn_target "amdgcn-amd-amdhsa--gfx600"
 ; GFX601: .amdgcn_target "amdgcn-amd-amdhsa--gfx601"
 ; GFX700: .amdgcn_target "amdgcn-amd-amdhsa--gfx700"
 ; GFX701: .amdgcn_target "amdgcn-amd-amdhsa--gfx701"
 ; GFX702: .amdgcn_target "amdgcn-amd-amdhsa--gfx702"
 ; GFX703: .amdgcn_target "amdgcn-amd-amdhsa--gfx703"
 ; GFX704: .amdgcn_target "amdgcn-amd-amdhsa--gfx704"
 ; GFX801: .amdgcn_target "amdgcn-amd-amdhsa--gfx801+xnack"
 ; GFX802: .amdgcn_target "amdgcn-amd-amdhsa--gfx802"
 ; GFX803: .amdgcn_target "amdgcn-amd-amdhsa--gfx803"
 ; GFX810: .amdgcn_target "amdgcn-amd-amdhsa--gfx810+xnack"
 ; GFX900: .amdgcn_target "amdgcn-amd-amdhsa--gfx900"
 ; GFX902: .amdgcn_target "amdgcn-amd-amdhsa--gfx902+xnack"
 ; GFX904: .amdgcn_target "amdgcn-amd-amdhsa--gfx904"
-; GFX906: .amdgcn_target "amdgcn-amd-amdhsa--gfx906+sram-ecc"
+; GFX906: .amdgcn_target "amdgcn-amd-amdhsa--gfx906"
 
 ; XNACK-GFX900: .amdgcn_target "amdgcn-amd-amdhsa--gfx900+xnack"
 ; NO-XNACK-GFX902: .amdgcn_target "amdgcn-amd-amdhsa--gfx902"
 
 ; SRAM-ECC-GFX904: .amdgcn_target "amdgcn-amd-amdhsa--gfx904+sram-ecc"
-; NO-SRAM-ECC-GFX906: "amdgcn-amd-amdhsa--gfx906"
+; SRAM-ECC-GFX906: "amdgcn-amd-amdhsa--gfx906+sram-ecc"
 
 ; SRAM-ECC-XNACK-GFX904: .amdgcn_target "amdgcn-amd-amdhsa--gfx904+xnack+sram-ecc"
-; XNACK-GFX906: .amdgcn_target "amdgcn-amd-amdhsa--gfx906+xnack+sram-ecc"
+; SRAM-ECC-XNACK-GFX906: .amdgcn_target "amdgcn-amd-amdhsa--gfx906+xnack+sram-ecc"
 
 define amdgpu_kernel void @directive_amdgcn_target() {
   ret void
 }

test/CodeGen/AMDGPU/elf-header-flags-mach.ll

 ; GFX803:        EF_AMDGPU_MACH_AMDGCN_GFX803 (0x2A)
 ; GFX810:        EF_AMDGPU_MACH_AMDGCN_GFX810 (0x2B)
 ; GFX810-NEXT:   EF_AMDGPU_XNACK              (0x100)
 ; GFX900:        EF_AMDGPU_MACH_AMDGCN_GFX900 (0x2C)
 ; GFX902:        EF_AMDGPU_MACH_AMDGCN_GFX902 (0x2D)
 ; GFX902-NEXT:   EF_AMDGPU_XNACK              (0x100)
 ; GFX904:        EF_AMDGPU_MACH_AMDGCN_GFX904 (0x2E)
 ; GFX906:        EF_AMDGPU_MACH_AMDGCN_GFX906 (0x2F)
-; GFX906-NEXT:   EF_AMDGPU_SRAM_ECC           (0x200)
 ; GFX909:        EF_AMDGPU_MACH_AMDGCN_GFX909 (0x31)
 ; ALL:         ]
 
 define amdgpu_kernel void @elf_header() {
   ret void
 }

test/CodeGen/AMDGPU/elf-header-flags-sram-ecc.ll

 ; RUN: llc -filetype=obj -march=amdgcn -mcpu=gfx902 < %s | llvm-readobj -file-headers - | FileCheck --check-prefixes=NO-SRAM-ECC-GFX902 %s
 ; RUN: llc -filetype=obj -march=amdgcn -mcpu=gfx902 -mattr=-sram-ecc < %s | llvm-readobj -file-headers - | FileCheck --check-prefixes=NO-SRAM-ECC-GFX902 %s
 ; RUN: llc -filetype=obj -march=amdgcn -mcpu=gfx902 -mattr=+sram-ecc < %s | llvm-readobj -file-headers - | FileCheck --check-prefixes=SRAM-ECC-GFX902 %s
 
-; RUN: llc -filetype=obj -march=amdgcn -mcpu=gfx906 < %s | llvm-readobj -file-headers - | FileCheck --check-prefixes=SRAM-ECC-GFX906 %s
+; RUN: llc -filetype=obj -march=amdgcn -mcpu=gfx906 < %s | llvm-readobj -file-headers - | FileCheck --check-prefixes=NO-SRAM-ECC-GFX906 %s
 ; RUN: llc -filetype=obj -march=amdgcn -mcpu=gfx906 -mattr=-sram-ecc < %s | llvm-readobj -file-headers - | FileCheck --check-prefixes=NO-SRAM-ECC-GFX906 %s
 ; RUN: llc -filetype=obj -march=amdgcn -mcpu=gfx906 -mattr=+sram-ecc < %s | llvm-readobj -file-headers - | FileCheck --check-prefixes=SRAM-ECC-GFX906 %s
 ; RUN: llc -filetype=obj -march=amdgcn -mcpu=gfx906 -mattr=+sram-ecc,+xnack < %s | llvm-readobj -file-headers - | FileCheck --check-prefixes=SRAM-ECC-XNACK-GFX906 %s
 
 ; NO-SRAM-ECC-GFX902:      Flags [
 ; NO-SRAM-ECC-GFX902-NEXT:   EF_AMDGPU_MACH_AMDGCN_GFX902 (0x2D)
 ; NO-SRAM-ECC-GFX902-NEXT:   EF_AMDGPU_XNACK              (0x100)
 ; NO-SRAM-ECC-GFX902-NEXT: ]

test/CodeGen/AMDGPU/load-hi16.ll

 ; RUN: llc -march=amdgcn -mcpu=gfx900 -amdgpu-sroa=0 -mattr=-promote-alloca -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN,GFX900 %s
-; RUN: llc -march=amdgcn -mcpu=gfx906 -amdgpu-sroa=0 -mattr=-promote-alloca -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN,GFX906,NO-D16-HI %s
+; RUN: llc -march=amdgcn -mcpu=gfx906 -amdgpu-sroa=0 -mattr=-promote-alloca,+sram-ecc -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN,GFX906,NO-D16-HI %s
 ; RUN: llc -march=amdgcn -mcpu=fiji -amdgpu-sroa=0 -mattr=-promote-alloca -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN,GFX803,NO-D16-HI %s
 
 ; GCN-LABEL: {{^}}load_local_lo_hi_v2i16_multi_use_lo:
 ; GFX900: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
 ; GFX900-NEXT: ds_read_u16 v2, v0
 ; GFX900-NEXT: v_mov_b32_e32 v3, 0
 ; GFX900-NEXT: s_waitcnt lgkmcnt(0)
 ; GFX900-NEXT: v_mov_b32_e32 v1, v2

test/CodeGen/AMDGPU/load-lo16.ll

 ; RUN: llc -march=amdgcn -mcpu=gfx900 -amdgpu-sroa=0 -mattr=-promote-alloca -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN,GFX900 %s
-; RUN: llc -march=amdgcn -mcpu=gfx906 -amdgpu-sroa=0 -mattr=-promote-alloca -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN,GFX906,NO-D16-HI %s
+; RUN: llc -march=amdgcn -mcpu=gfx906 -amdgpu-sroa=0 -mattr=-promote-alloca,+sram-ecc -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN,GFX906,NO-D16-HI %s
 ; RUN: llc -march=amdgcn -mcpu=fiji -amdgpu-sroa=0 -mattr=-promote-alloca -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN,GFX803,NO-D16-HI %s
 
 ; GCN-LABEL: {{^}}load_local_lo_v2i16_undeflo:
 ; GCN: s_waitcnt
 ; GFX900-NEXT: ds_read_u16_d16 v0, v0
 ; GFX900-NEXT: s_waitcnt
 ; GFX900-NEXT: s_setpc_b64
 

test/CodeGen/AMDGPU/store-hi16.ll

 ; RUN: llc -march=amdgcn -mcpu=gfx900 -amdgpu-sroa=0 -mattr=-promote-alloca -verify-machineinstrs < %s | FileCheck -allow-deprecated-dag-overlap -check-prefixes=GCN,GFX900 %s
-; RUN: llc -march=amdgcn -mcpu=gfx906 -amdgpu-sroa=0 -mattr=-promote-alloca -verify-machineinstrs < %s | FileCheck -allow-deprecated-dag-overlap -check-prefixes=GCN,GFX906,NO-D16-HI %s
+; RUN: llc -march=amdgcn -mcpu=gfx906 -amdgpu-sroa=0 -mattr=-promote-alloca,+sram-ecc -verify-machineinstrs < %s | FileCheck -allow-deprecated-dag-overlap -check-prefixes=GCN,GFX906,NO-D16-HI %s
 ; RUN: llc -march=amdgcn -mcpu=fiji -amdgpu-sroa=0 -mattr=-promote-alloca -verify-machineinstrs < %s | FileCheck -allow-deprecated-dag-overlap -check-prefixes=GCN,GFX803,NO-D16-HI %s
 
 ; GCN-LABEL: {{^}}store_global_hi_v2i16:
 ; GCN: s_waitcnt
 
 ; GFX900-NEXT: global_store_short_d16_hi v[0:1], v2, off
 
 ; NO-D16-HI-NEXT: v_lshrrev_b32_e32 v2, 16, v2