FINALLY?

code/duffle/gen/macs.h

@@ -214,12 +214,15 @@ WORD_COUNT(mac_apply_matrix_lv, 31)
 
 #define mac_trans_matrix(r_mtx, r_off, r_t1) \
 	load_word(r_t1, r_off, O_(V3_S4,x)) \
+,	nop \
 ,	store_word(r_t1, r_mtx, O_(MT3_S2S4,t[0])) \
 ,	load_word(r_t1, r_off, O_(V3_S4,y)) \
+,	nop \
 ,	store_word(r_t1, r_mtx, O_(MT3_S2S4,t[1])) \
 ,	load_word(r_t1, r_off, O_(V3_S4,z)) \
+,	nop \
 ,	store_word(r_t1, r_mtx, O_(MT3_S2S4,t[2]))
-WORD_COUNT(mac_trans_matrix, 6)
+WORD_COUNT(mac_trans_matrix, 9)
 
 #define mac_gcmd_push(cmd, reg_transfer, reg_base, port) \
 	load_upper_i(reg_transfer, u4_hi(cmd)) \

code/duffle/gte.atom.c

@@ -151,12 +151,15 @@ FI_ Slice_MipsCode ac_trans_matrix(AtomBuilder_R ab
 	,	U4 r_t1
 ) MipsAtomComp_Proc_(ac_trans_matrix, ab, {
 	load_word(r_t1, r_off, O_(V3_S4,x)),
+	nop,
 	store_word(r_t1, r_mtx, O_(MT3_S2S4,t[0])),
 
 	load_word(r_t1, r_off, O_(V3_S4,y)),
+	nop,
 	store_word(r_t1, r_mtx, O_(MT3_S2S4,t[1])),
 
 	load_word(r_t1, r_off, O_(V3_S4,z)),
+	nop,
 	store_word(r_t1, r_mtx, O_(MT3_S2S4,t[2])),
 })
 

code/hello_camera/hello_camera.atom.c

@@ -123,6 +123,7 @@ enum {
 	/* Wave-context GPR carrier for the resolve_look_at bundle: the scratch base.
 	* Set by atom 0 (popped from tape), read by atoms 1-6 (used as pointer base). */
 	R_ResolveScratch = R_T4 atom_reg atom_type(U4*),
+#define R_ResolveScratch_Code R_T4_Code
 };
 typedef Struct_(Binds_ResolveLookAt) {
 	MT3_S2S4* look_at;
@@ -561,15 +562,6 @@ internal MipsAtom* resolve_look_at__matrix_vector_proc(AtomArena_R aa
 	add_si(r_peye, r_scratch, O_(ResolveLookAtScratch,eye)),
 	nop,
 
-	/* Load pos = -eye from scratch. */
-	load_word(r_tmp0, r_peye, O_(P3_S4,x)),
-	load_word(r_tmp1, r_peye, O_(P3_S4,y)),
-	load_word(r_tmp2, r_peye, O_(P3_S4,z)),
-	nop,
-	sub_u(r_tmp0, R_0, r_tmp0),  /* pos.x = -eye.x */
-	sub_u(r_tmp1, R_0, r_tmp1),
-	sub_u(r_tmp2, R_0, r_tmp2),
-
 	/* === Load RT matrix from look_at into C2[0..4] via ctc2 ===
 	 * Exact same sequence as set_gte_mt3s2s4 / C11's ApplyMatrixLV. */
 	load_word(r_tmp0, r_look_at,  0), nop,
@@ -584,6 +576,15 @@ internal MipsAtom* resolve_look_at__matrix_vector_proc(AtomArena_R aa
 	gte_mv_to_ctrl_r(r_tmp0, gte_cr_RT22),
 	nop2,  /* CTC2 retirement (2 slots × 5 ctc2s) */
 
+	/* Load pos = -eye after the matrix load releases r_tmp0. */
+	load_word(r_tmp0, r_peye, O_(P3_S4,x)),
+	load_word(r_tmp1, r_peye, O_(P3_S4,y)),
+	load_word(r_tmp2, r_peye, O_(P3_S4,z)),
+	nop,
+	sub_u(r_tmp0, R_0, r_tmp0),  /* pos.x = -eye.x */
+	sub_u(r_tmp1, R_0, r_tmp1),
+	sub_u(r_tmp2, R_0, r_tmp2),
+
 	/* === mtc2 pos (as S16) to IR1/2/3 ===
 	 * The GTE takes low 16 bits. pos fits in S16. For negative pos, the
 	 * 32-bit sign-extended value's low 16 bits = correct S16. */

code/hello_camera/hello_camera.c

@@ -241,7 +241,6 @@ internal void resolve_look_at_init(void) {
 		r_tmp0_0, r_tmp1_0, r_tmp2_0, r_tmp3_0);
 
 	/* === ATOM 1: normalize fwd→uz === */
-	ab.start = ab.start + ab.used;
 	U4 const r_src_offset_1  = O_(ResolveLookAtScratch, fwd);
 	U4 const r_dst_offset_1  = O_(ResolveLookAtScratch, uz);
 	U4 const r_src_ptr_1     = R_T0;