Envelope Shape

00016174: 90820000 lbu r2,0x0000(r4)
00016178: 00000000 nop
0001617c: acc20058 sw r2,0x0058(r6)
00016180: 90820001 lbu r2,0x0001(r4)
00016184: 00000000 nop
00016188: acc2005c sw r2,0x005c(r6)
0001618c: 94c20004 lhu r2,0x0004(r6)
00016190: 90830002 lbu r3,0x0002(r4)
00016194: 344201f0 ori r2,r2,0x01f0
00016198: a4c20004 sh r2,0x0004(r6)
0001619c: 24820003 addiu r2,r4,0x0003
000161a0: 03e00008 jr r31
000161a4: acc30060 sw r3,0x0060(r6)