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https://github.com/zeldaret/oot.git
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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
66 lines
1.4 KiB
ArmAsm
66 lines
1.4 KiB
ArmAsm
#include "ultra64/asm.h"
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.set noat
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.set noreorder
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.section .text
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.balign 16
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LEAF(bzero)
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slti $at, $a1, 0xC
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bnez $at, bytezero
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negu $v1, $a0
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andi $v1, $v1, 3
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beqz $v1, blkzero
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subu $a1, $a1, $v1
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swl $zero, ($a0)
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addu $a0, $a0, $v1
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blkzero:
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// align backwards to 0x20
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li $at, ~0x1F
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and $a3, $a1, $at
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// If the result is zero, the amount to zero is less than 0x20 bytes
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beqz $a3, wordzero
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subu $a1, $a1, $a3
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// zero in blocks of 0x20 at a time
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addu $a3, $a3, $a0
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1:
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addiu $a0, $a0, 0x20
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sw $zero, -0x20($a0)
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sw $zero, -0x1C($a0)
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sw $zero, -0x18($a0)
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sw $zero, -0x14($a0)
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sw $zero, -0x10($a0)
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sw $zero, -0xC($a0)
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sw $zero, -8($a0)
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bne $a0, $a3, 1b
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sw $zero, -4($a0)
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wordzero:
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// align backwards to 0x4
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li $at, ~3
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and $a3, $a1, $at
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// If the result is zero, the amount to zero is less than 0x4 bytes
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beqz $a3, bytezero
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subu $a1, $a1, $a3
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// zero one word at a time
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addu $a3, $a3, $a0
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1:
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addiu $a0, $a0, 4
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bne $a0, $a3, 1b
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sw $zero, -4($a0)
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bytezero:
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// test if nothing left to zero
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blez $a1, zerodone
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nop
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// zero one byte at a time
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addu $a1, $a1, $a0
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1:
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addiu $a0, $a0, 1
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bne $a0, $a1, 1b
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sb $zero, -1($a0)
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zerodone:
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jr $ra
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nop
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END(bzero)
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