mirror of
https://github.com/zeldaret/oot.git
synced 2024-11-29 03:34:07 +00:00
7334ffa373
* Format all handwritten asm and document some * Use c preprocessor for constants * Fix * Fix PI_STATUS_ERROR, some label improvements * Avoid hi/lo for constants * Some more comments * Properly mark functions as functions and their sizes * Fix merge * Improvements * Review suggestions, rework procedure start/end macros to be more like libreultra * Move IPL3 symbol definitions into ipl3.s * Fix undefined_syms, add include and language guards to asm.h and fix the comment in gbi.h * Consistent hex capitalization, add some MIPS builtin defines to CC_CHECK to behave properly * Add -no-pad-sections assembler option and clean up alignment in gu files and bzero * Further suggestions and improvements * Matrix conversion function clarifications * Fix passing AVOID_UB to gcc * Suggestions * Suggestions, global interrupt mask improvements * Further suggestions, interrupt mask comments * Comments fixes, rdb.h * Switch from # comments to // comments, remove unnecesary .set gp=64 directives * Further review suggestions * Missed one
65 lines
1.4 KiB
ArmAsm
65 lines
1.4 KiB
ArmAsm
#include "ultra64/asm.h"
|
|
|
|
.set noat
|
|
.set noreorder
|
|
|
|
.section .text
|
|
|
|
.balign 16
|
|
|
|
LEAF(bzero)
|
|
slti $at, $a1, 0xC
|
|
bnez $at, bytezero
|
|
negu $v1, $a0
|
|
andi $v1, $v1, 3
|
|
beqz $v1, blkzero
|
|
subu $a1, $a1, $v1
|
|
swl $zero, ($a0)
|
|
addu $a0, $a0, $v1
|
|
blkzero:
|
|
// align backwards to 0x20
|
|
li $at, ~0x1F
|
|
and $a3, $a1, $at
|
|
// If the result is zero, the amount to zero is less than 0x20 bytes
|
|
beqz $a3, wordzero
|
|
subu $a1, $a1, $a3
|
|
// zero in blocks of 0x20 at a time
|
|
addu $a3, $a3, $a0
|
|
1:
|
|
addiu $a0, $a0, 0x20
|
|
sw $zero, -0x20($a0)
|
|
sw $zero, -0x1C($a0)
|
|
sw $zero, -0x18($a0)
|
|
sw $zero, -0x14($a0)
|
|
sw $zero, -0x10($a0)
|
|
sw $zero, -0xC($a0)
|
|
sw $zero, -8($a0)
|
|
bne $a0, $a3, 1b
|
|
sw $zero, -4($a0)
|
|
wordzero:
|
|
// align backwards to 0x4
|
|
li $at, ~3
|
|
and $a3, $a1, $at
|
|
// If the result is zero, the amount to zero is less than 0x4 bytes
|
|
beqz $a3, bytezero
|
|
subu $a1, $a1, $a3
|
|
// zero one word at a time
|
|
addu $a3, $a3, $a0
|
|
1:
|
|
addiu $a0, $a0, 4
|
|
bne $a0, $a3, 1b
|
|
sw $zero, -4($a0)
|
|
bytezero:
|
|
// test if nothing left to zero
|
|
blez $a1, zerodone
|
|
nop
|
|
// zero one byte at a time
|
|
addu $a1, $a1, $a0
|
|
1:
|
|
addiu $a0, $a0, 1
|
|
bne $a0, $a1, 1b
|
|
sb $zero, -1($a0)
|
|
zerodone:
|
|
jr $ra
|
|
nop
|
|
END(bzero)
|