Two values, one register
Consoles are starved for memory, so game code loves packing several small values into one 32-bit word. The write half of that habit is a three-step dance: shift one value up to its slot, mask the other down to size, OR them together. Here's a byte-sized version — two values packed as (hi << 8) | (lo & 0xff):
sll t6, a0, 8 # first value, moved up past the low byte
andi t7, a1, 0xff # second value, clipped to exactly one byte
or v0, t6, t7 # snap the two halves together
jr ra
nop
Each instruction is one job:
sll positions. The shift amount is where the upper field begins.andi clips. The mask guarantees the low value can't bleed into the upper field's bits — even if the caller passed something too big.or merges. The two pieces occupy disjoint bits, so OR is a pure paste, losing nothing.
Reading one of these backwards: the sll amount and the andi mask are the two constants your C needs, and they normally agree — a shift by 8 pairs with an 8-bit mask, a shift by 16 with a 16-bit mask. If they don't agree, believe the assembly and write what it says.
The target packs wider fields. Read its two constants and write the dance in C — shift, mask, OR.
Your task
Write func_8037f398 to reproduce the target assembly.