Token-lane block for the RDNA4 native-FP8 layers: enc1, dec1 and the enc3 tube

swin_tok.h passes the weights as the first WMMA operand and the activations as the second, so each GEMM's encoded result is already the next one's operand and stays in registers (swin_block.h transposes every result through LDS). One wave owns one 4x4 window for the whole block: norms, attention and the MLP need no LDS and no barriers; only the patch expand and the patch merge go through an e4m3 image in LDS. Outputs are bit-identical to swin_block.h (swapped WMMA operand roles, verified on an RX 9070 XT and on recorded launches). mix2 rounds in place (accumulator is addend and destination, no copy per pair). -DSWIN_NO_TOKEN_LANES builds these layers from swin_block.h again; enc2 and dec2 are unchanged. RX 9070 XT accuracy set, 2560x1440 render: whole evaluation 8.56 -> 7.18 ms.

kernels/m/rrlite_enc3_tube_4x4.hip

@@ -11,6 +11,10 @@
 // recreation. Address-only caching then serves stale packed weights. Prepare
 // each launch; the default single image is sufficient on the launch stream.
 #define SWIN_PREP_KEY_AT 0
+// RDNA4 native FP8 builds use the token-lane block (swin_tok.h); -DSWIN_NO_TOKEN_LANES keeps swin_block.h
+#ifndef SWIN_NO_TOKEN_LANES
+#define SWIN_TOKEN_LANES
+#endif
 #include "swin_block.h"
 #ifndef SWIN_NW
 #define SWIN_NW 8