phase9: merge B 2 — 394 regions / 385 distinct bodies

B: 32 new this cycle. Load-bearing insight: frame slots never read back are
the callee's 9th/10th stack arguments (0x80057748 was 68-vs-80 until the
10-arg call). Branchless conditional lever (ternary-zero differs from
if/else — sltu+negu+and). negu evidence set grows (3rd row) for finding
26's toolchain direction. Sibling 0x8005789C (11th stack arg) recorded
with the start-from-10-args note. Gate MATCH whole-binary SHA-1
e173426c157384ebf1b6caf8c6fea18a85a14af9.

config/regions.tsv

@@ -111,6 +111,7 @@
 0x80031F78	0x80031FC4	src/func_80031F78.c
 0x800321EC	0x800321F8	src/func_800321EC.c
 0x80034A80	0x80034ABC	src/func_80034A80.c
+0x800354F8	0x80035548	src/func_800354F8.c
 0x80036308	0x80036328	src/func_80036308.c
 0x80036328	0x8003636C	src/func_80036328.c
 0x8003636C	0x80036378	src/func_8003636C.c
@@ -150,6 +151,7 @@
 0x8005182C	0x80051864	src/func_8005182C.c
 0x80052C98	0x80052CAC	src/func_80052C98.c
 0x80057524	0x80057564	src/func_80057524.c
+0x80057748	0x80057798	src/func_80057748.c
 0x8005784C	0x8005789C	src/func_8005784C.c
 0x800579A0	0x800579F0	src/func_800579A0.c
 0x80057AE0	0x80057B30	src/func_80057AE0.c

src/func_800354F8.c

@@ -0,0 +1,59 @@
+/* func_800354F8 — 0x800354F8..0x80035548 (80 bytes).
+ *
+ * Original words:
+ *   27BDFFE8  addiu sp,sp,-24
+ *   AFB00010  sw    s0,16(sp)
+ *   AFBF0014  sw    ra,20(sp)
+ *   0C00CEB7  jal   0x80033ADC
+ *   00808021  _move s0,a0            (delay slot) keep the argument
+ *   0C00D18E  jal   0x80034638
+ *   02002021  _move a0,s0            (delay slot)
+ *   0C00D2A0  jal   0x80034A80
+ *   02002021  _move a0,s0            (delay slot)
+ *   0C00C7AF  jal   0x80031EBC
+ *   02002021  _move a0,s0            (delay slot)
+ *   0C00D2AF  jal   0x80034ABC
+ *   02002021  _move a0,s0            (delay slot)
+ *   0C00D394  jal   0x80034E50
+ *   02002021  _move a0,s0            (delay slot)
+ *   8FBF0014  lw    ra,20(sp)
+ *   8FB00010  lw    s0,16(sp)
+ *   27BD0018  addiu sp,sp,24
+ *   03E00008  jr    ra
+ *   00000000  nop
+ *
+ * Six calls in sequence, all with the routine's single argument, none returning a value.
+ *
+ * The first call receives the argument directly (`move s0,a0` is in its delay slot because
+ * `s0` is the *save*, not the setup), and every later call is set up by `move a0,s0` in its
+ * own delay slot — so all six call sites share one saved register and the frame exists only
+ * for that. Six identical `move`-into-delay-slot patterns is the signature of a flat call
+ * sequence rather than a loop, and the order below is the order they appear.
+ *
+ * One of the callees, `0x80034A80`, is already registered in this project as a
+ * compiler-artefact row (a 112-byte frame receiving a 16-byte struct copy that is then
+ * discarded), which is independent corroboration that this address is a real routine start
+ * and that this row calls what it appears to call.
+ *
+ * LIMITS: the callees are named for their addresses and nothing establishes their
+ * signatures beyond the single register set at each site; all six are written as taking one
+ * `int` because that is all the original passes. Whether any of them returns a value is
+ * invisible here, since no result is used.
+ */
+
+void func_80033ADC(int a0);
+void func_80034638(int a0);
+void func_80034A80(int a0);
+void func_80031EBC(int a0);
+void func_80034ABC(int a0);
+void func_80034E50(int a0);
+
+void func_800354F8(int a0)
+{
+    func_80033ADC(a0);
+    func_80034638(a0);
+    func_80034A80(a0);
+    func_80031EBC(a0);
+    func_80034ABC(a0);
+    func_80034E50(a0);
+}

src/func_80057748.c

@@ -0,0 +1,58 @@
+/* func_80057748 — 0x80057748..0x80057798 (80 bytes).
+ *
+ * Original words:
+ *   27BDFFD0  addiu sp,sp,-48
+ *   30A700FF  andi  a3,a1,0xff       narrow the second argument
+ *   30C600FF  andi  a2,a2,0xff       narrow the third
+ *   AFA70020  sw    a3,32(sp)        local[8] = narrowed a1
+ *   0007382B  sltu  a3,zero,a3       a3 = (narrowed a1 != 0)
+ *   00073823  negu  a3,a3            a3 = 0 or -1
+ *   24050001  li    a1,1
+ *   AFA60024  sw    a2,36(sp)        local[9] = narrowed a2
+ *   2406FFFF  li    a2,-1
+ *   00873824  and   a3,a0,a3         a3 = a0 & that mask
+ *   AFBF0028  sw    ra,40(sp)
+ *   AFA00010  sw    zero,16(sp)      local[0] = 0
+ *   AFA00014  sw    zero,20(sp)      local[1] = 0
+ *   AFA00018  sw    zero,24(sp)      local[2] = 0
+ *   0C015D99  jal   0x80057664
+ *   AFA0001C  _sw   zero,28(sp)      (delay slot) local[3] = 0
+ *   8FBF0028  lw    ra,40(sp)
+ *   27BD0030  addiu sp,sp,48
+ *   03E00008  jr    ra
+ *   00000000  nop
+ *
+ * **The zero-or-minus-one mask is the interesting construction, and it is the
+ * branchless conditional.** `sltu a3,zero,a3` sets `a3` to 1 iff the narrowed argument is
+ * non-zero, and the following `negu a3,a3` turns that into 0 or **-1** — so `and a3,a0,a3`
+ * either keeps `a0` or clears it with **no branch at all**. That is exactly what a
+ * conditional expression `(narrowed ? a0 : 0)` compiles to when cc1 avoids a branch, and it
+ * is why the same argument is written as a ternary here rather than an `if`.
+ *
+ * `negu`, not the trapping `sub`, is again positive evidence for this toolchain (finding
+ * 26's direction), and it appears twice in this family.
+ *
+ * The frame is 48 bytes and the call's outgoing register arguments are `a0`, 1, -1 and the
+ * masked value, while the four words at 16-28(sp) are zeroed — which is the outgoing stack
+ * argument area, so the callee takes **eight** arguments and the last four are all zero.
+ * The two narrowed values land at 32 and 36(sp), i.e. beyond the outgoing area, so they are
+ * frame locals that this routine writes and never reads.
+ *
+ * LIMITS: the mask 0xff, the constants 1 and -1, and the frame layout are read from the
+ * bytes. That the narrowed values are never read back follows from their frame offsets being
+ * past the argument area; nothing establishes why they are stored. Whether the callee's last
+ * four arguments are genuinely meant to be zero or are a partially filled structure cannot
+ * be told from this body, and the eight-argument signature is inferred purely from the four
+ * zeroed stack words.
+ */
+
+void func_80057664(int a0, int a1, int a2, int a3, int a4, int a5, int a6, int a7,
+                   int a8, int a9);
+
+void func_80057748(int a0, int a1, int a2)
+{
+    int narrowed1 = a1 & 0xff;
+    int narrowed2 = a2 & 0xff;
+
+    func_80057664(a0, 1, -1, narrowed1 ? a0 : 0, 0, 0, 0, 0, narrowed1, narrowed2);
+}