feat: add d4r inference engines and Windows parity tooling

Add native K/M/RR inference engines, HIP kernels, replay and validation
harnesses, and Windows DLSS setup and runtime support. Include GPU
profiling tools, build and packaging scripts, platform integration
patches, and implementation documentation.

engine/rr/spv_float_controls.py

@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+"""Give a compute SPIR-V module PTX's floating-point environment: RoundingModeRTE for 16- and 32-bit results and
+DenormPreserve for 16-bit values (SPV_KHR_float_controls, core in SPIR-V 1.4).
+
+usage: spv_float_controls.py IN.spv [OUT.spv]
+
+Without these execution modes the rounding of float conversions is the driver's choice, where every cvt.rn of
+NVIDIA's kernels rounds to nearest even. glslang keeps only one execution mode per mode id, so the modes are inserted
+into the compiled module instead.
+"""
+import struct
+import sys
+
+OP_EXTENSION, OP_CAPABILITY, OP_ENTRY_POINT, OP_EXECUTION_MODE = 10, 17, 15, 16
+CAP_DENORM_PRESERVE, CAP_ROUNDING_RTE = 4464, 4467
+MODES = ((4462, 16), (4462, 32), (4459, 16))   # RoundingModeRTE 16/32, DenormPreserve 16
+EXTENSION = 'SPV_KHR_float_controls'
+
+
+def instructions(words):
+    i = 5
+    while i < len(words):
+        count = words[i] >> 16
+        yield words[i] & 0xffff, words[i:i + count]
+        i += count
+
+
+def string_words(text):
+    data = text.encode() + b'\0'
+    data += b'\0' * (-len(data) % 4)
+    return list(struct.unpack(f'<{len(data) // 4}I', data))
+
+
+def patch(words):
+    insts = list(instructions(words))
+    caps = {w[1] for op, w in insts if op == OP_CAPABILITY}
+    has_ext = any(op == OP_EXTENSION and EXTENSION.encode() in struct.pack(f'<{len(w) - 1}I', *w[1:]) for op, w in insts)
+    entry = next(w[2] for op, w in insts if op == OP_ENTRY_POINT)
+    modes = {(w[2], w[3]) for op, w in insts if op == OP_EXECUTION_MODE and w[1] == entry and len(w) > 3}
+    last_cap = max(i for i, (op, _) in enumerate(insts) if op == OP_CAPABILITY)
+    first_mode = min(i for i, (op, _) in enumerate(insts) if op == OP_EXECUTION_MODE)
+    out = list(words[:5])
+    for i, (op, w) in enumerate(insts):
+        if i == first_mode:
+            for mode, width in MODES:
+                if (mode, width) not in modes:
+                    out += [4 << 16 | OP_EXECUTION_MODE, entry, mode, width]
+        out += w
+        if i == last_cap:
+            for cap in (CAP_DENORM_PRESERVE, CAP_ROUNDING_RTE):
+                if cap not in caps:
+                    out += [2 << 16 | OP_CAPABILITY, cap]
+            if not has_ext:
+                name = string_words(EXTENSION)
+                out += [(1 + len(name)) << 16 | OP_EXTENSION, *name]
+    return out
+
+
+def main():
+    src = sys.argv[1]
+    dst = sys.argv[2] if len(sys.argv) > 2 else src
+    data = open(src, 'rb').read()
+    words = list(struct.unpack(f'<{len(data) // 4}I', data))
+    if words[0] != 0x07230203:
+        sys.exit(f'{src}: not SPIR-V')
+    out = patch(words)
+    open(dst, 'wb').write(struct.pack(f'<{len(out)}I', *out))
+
+
+if __name__ == '__main__':
+    main()