Improve GPU compatibility, RDNA2 kernels and startup diagnostics

- Match render/compute adapters and gate RR models by GPU capabilities
- Add RDNA2 native texture kernels and fix FP16 rounding
- Harden model builds, cache validation and packaging
- Add startup tracing, timeouts, documentation and regression tests

kernels/native/build_native.sh

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
 # build_native.sh SRC.hip OUT.hsaco [extra clang flags]: natively compiled DLSS texture kernel (gfx1101, wave64 default)
+# WAVE=32|64 (default 64); CUMODE=1|0 (default 1): CU mode, or WGP mode (a workgroup's waves on all four SIMDs)
 set -euo pipefail
 ND=$(cd "$(dirname "$0")" && pwd)
 SRC=$(realpath "$1") OUT=$(realpath -m "$2"); shift 2
@@ -8,9 +9,10 @@ R=${D4R_ROCM_DIR:-/opt/rocm}
 ARCH=${D4R_GPU_ARCH:-gfx1101}
 W=${WAVE:-64}
 WF=$([[ $W == 64 ]] && echo -mwavefrontsize64 || echo -mno-wavefrontsize64)
+CU=$([[ ${CUMODE:-1} == 1 ]] && echo -mcumode || echo -mno-cumode)
 D=$(cd "$(dirname "$SRC")" && pwd)
 T=$(mktemp -d); trap 'rm -rf "$T"' EXIT
-(cd "$T" && "$R/lib/llvm/bin/clang++" -x hip -std=c++20 --offload-arch=$ARCH --offload-device-only -O3 $WF -mcumode \
+(cd "$T" && "$R/lib/llvm/bin/clang++" -x hip -std=c++20 --offload-arch=$ARCH --offload-device-only -O3 $WF $CU \
   -ffp-contract=off -fgpu-flush-denormals-to-zero -fno-fast-math -I"$D" -I"$ND" -I"$R/include" --rocm-path="$R" \
   --rocm-device-lib-path="$R/amdgcn/bitcode" "$@" -o "$OUT" "$SRC" -save-temps=cwd --no-gpu-bundle-output)
 S=$(ls "$T"/*.s | head -1)