Reproduce gfx12 FP16 accumulator differences and preserve K baseline

scripts/windows/build-native-k-f16-wmma.ps1

@@ -0,0 +1,40 @@
+[CmdletBinding()]
+param([ValidateSet('enc0','enc1','enc2','enc3','enc4','dec5','dec4','dec3','dec2','dec1','dec0')]
+    [string]$Layer='enc1', [string]$HipRoot, [string]$OutputDirectory)
+$ErrorActionPreference='Stop'
+$repo=[IO.Path]::GetFullPath((Join-Path $PSScriptRoot '../..'))
+if (!$HipRoot) { $HipRoot=Join-Path $repo '.tools/therock-10.2.0a20260929/_rocm_sdk_core' }
+if (!$OutputDirectory) { $OutputDirectory=Join-Path $repo 'build/native-k-f16-wmma-experimental' }
+$OutputDirectory=[IO.Path]::GetFullPath($OutputDirectory)
+if ($OutputDirectory -eq [IO.Path]::GetFullPath((Join-Path $repo 'build/native-k-gfx1201'))) {
+    throw 'Keep the validated baseline separate from this experimental build.'
+}
+$compiler=Join-Path $HipRoot 'lib/llvm/bin/clang++.exe'
+if (!(Test-Path -LiteralPath $compiler)) { $compiler=Join-Path $HipRoot 'bin/clang++.exe' }
+if (!(Test-Path -LiteralPath $compiler)) { throw "HIP compiler missing under $HipRoot" }
+$name="dltss_pwin_${Layer}_layer"
+$source=Join-Path $repo "kernels/k/$name.hip"
+$flags=@()
+if ((Get-Content -LiteralPath $source -Raw) -match '// d4r-build-flags: ([^\r\n]+)') { $flags=$Matches[1].Trim().Split(' ') }
+New-Item -ItemType Directory -Force $OutputDirectory | Out-Null
+$object=Join-Path $OutputDirectory "$name.hsaco"
+$ErrorActionPreference='Continue'
+& $compiler -x hip -std=c++17 --offload-arch=gfx1201 --offload-device-only --no-gpu-bundle-output `
+    -mno-wavefrontsize64 -nogpuinc -nogpulib -O3 -DD4R_DEVICE_ONLY_MINIMAL `
+    -DD4R_K_FP16_BASELINE -DD4R_K_F16_WMMA @flags $source -o $object `
+    > (Join-Path $OutputDirectory "$name.build.stdout.log") 2> (Join-Path $OutputDirectory "$name.build.stderr.log")
+$ErrorActionPreference='Stop'
+if ($LASTEXITCODE) { throw "Experimental K FP16 WMMA compile failed: $Layer" }
+$isa=Join-Path $OutputDirectory "$name.isa.txt"
+& (Join-Path (Split-Path $compiler) 'llvm-objdump.exe') --disassemble --mcpu=gfx1201 $object > $isa
+if ($LASTEXITCODE -or !(Select-String -LiteralPath $isa -Pattern 'v_wmma_f16_16x16x16_f16')) {
+    throw 'Packed FP16 WMMA is absent from ISA; no alternative instruction is accepted.'
+}
+& (Join-Path (Split-Path $compiler) 'llvm-readobj.exe') --notes $object `
+    > (Join-Path $OutputDirectory "$name.metadata.txt")
+if ($LASTEXITCODE) { throw 'Native object metadata extraction failed.' }
+@{layer=$Layer; architecture='gfx1201'; experimental=$true; numericalValidation='pending';
+    compiler=$compiler; sha256=(Get-FileHash -LiteralPath $object -Algorithm SHA256).Hash} |
+    ConvertTo-Json | Set-Content -LiteralPath (Join-Path $OutputDirectory "$name.build-info.json") -Encoding UTF8
+Write-Host "Compiled experimental gfx1201 packed FP16 WMMA: $Layer. Validate before selecting another layer."
+# This script does not generate an override manifest or install into the game.

scripts/windows/test-wmma-f16.ps1

@@ -0,0 +1,24 @@
+[CmdletBinding()]
+param([string]$HipRoot, [string]$PackageRoot, [string]$OutputDirectory)
+$ErrorActionPreference='Stop'
+$repo=[IO.Path]::GetFullPath((Join-Path $PSScriptRoot '../..'))
+if (!$HipRoot) { $HipRoot=Join-Path $repo '.tools/therock-10.2.0a20260929/_rocm_sdk_core' }
+if (!$PackageRoot) { $PackageRoot=Join-Path $repo 'dist/windows-rdna4-command-list' }
+if (!$OutputDirectory) { $OutputDirectory=Join-Path $repo ('test-results/wmma-f16-' + (Get-Date -Format 'yyyyMMdd-HHmmss-fff')) }
+$compiler=Join-Path $HipRoot 'lib/llvm/bin/clang++.exe'
+if (!(Test-Path -LiteralPath $compiler)) { $compiler=Join-Path $HipRoot 'bin/clang++.exe' }
+New-Item -ItemType Directory -Force $OutputDirectory | Out-Null
+$module=Join-Path $OutputDirectory 'wmma_f16_compare.hsaco'
+& $compiler -x hip -std=c++17 --offload-arch=gfx1201 --offload-device-only --no-gpu-bundle-output `
+    -mno-wavefrontsize64 -nogpuinc -nogpulib -O3 (Join-Path $repo 'tools/windows/wmma_f16_compare.hip') -o $module
+if ($LASTEXITCODE) { throw 'WMMA arithmetic probe compilation failed.' }
+$previousPython=$env:PYTHONPATH
+try {
+    $env:PYTHONPATH="$(Join-Path $repo '.tools/python/vendor');$previousPython"
+    & python.exe (Join-Path $repo 'tools/windows/wmma_f16_compare.py') `
+        --probe (Join-Path $PackageRoot 'bin/d4r_native_replay_probe.exe') --module $module `
+        --hip-root $HipRoot --output-dir $OutputDirectory
+    if ($LASTEXITCODE) { throw "WMMA arithmetic diagnostic failed; logs: $OutputDirectory" }
+} finally { $env:PYTHONPATH=$previousPython }
+# A successful diagnostic is not acceptance of native FP16 accumulators for K.
+# Read baselineEquivalent/gameOptimizationAccepted in validation.json.