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weird_asm_code [2015/12/03 16:40] queueram use custom mipsasm format |
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| - | ====== Weird ASM Code ====== | ||
| - | Throughout the SM64 ROM there is a lot of weird assembly code. The purpose of this page is to document all the ASM weirdness. | ||
| - | ===== Kill it Again ===== | ||
| - | In case the first ANDI didn't work, the compiler inserts a second one. It does this two more times. | ||
| - | |||
| - | <code mipsasm>Behavior1F: # begin 80385114 (101E94) | ||
| - | addiu $sp, $sp, -0x10 | ||
| - | lw $t6, 0x80361164 | ||
| - | lw $t7, ($t6) | ||
| - | srl $t8, $t7, 0x10 | ||
| - | andi $t9, $t8, 0xff | ||
| - | andi $t0, $t9, 0xff | ||
| - | sw $t0, 0xc($sp)</code> | ||
| - | |||
| - | ===== Branch Branch Branch ===== | ||
| - | All the branch delay slots weren't enough, so the compiler inserted 3 back-to-back branches, including one that can't even be reached! | ||
| - | <code mipsasm># From LevelProc_8024BCD8 starting at 8024BD30: | ||
| - | b .L60 | ||
| - | nop | ||
| - | .L60: | ||
| - | b .L70 | ||
| - | lw $v0, 0x24($sp) | ||
| - | b .L70 | ||
| - | nop | ||
| - | .L70: | ||
| - | lw $ra, 0x1c($sp)</code> | ||
