mips memset

gistfile1.asm

### memset2 ###
.macro f_fill64 dst, offset, val, fixup
9:  sw \val, (\offset + 0 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous
9:  sw \val, (\offset + 1 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous
9:  sw \val, (\offset + 2 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous
9:  sw \val, (\offset + 3 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous
9:  sw \val, (\offset + 4 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous
9:  sw \val, (\offset + 5 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous
9:  sw \val, (\offset + 6 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous
9:  sw \val, (\offset + 7 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous

9:  sw \val, (\offset + 8 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous
9:  sw \val, (\offset + 9 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous
9:  sw \val, (\offset + 10 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous
9:  sw \val, (\offset + 11 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous
9:  sw \val, (\offset + 12 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous
9:  sw \val, (\offset + 13 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous
9:  sw \val, (\offset + 14 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous
9:  sw \val, (\offset + 15 * 4)(\dst); .section __ex_table,"a"; .word 9b, \fixup; .previous

.endm
.set noreorder
.align 5
 
.globl memset2; .align 2; .type memset2, @function; .ent memset2, 0; memset2: .frame $29, 0, $31
    beqz $5, 1f
    move $2, $4
    
    andi $5, 0xff
    sll $9, $5, 8
    or $5, $9
    sll $9, $5, 16
    or $5, $9
1:

.globl __bzero; .type __bzero, @function; __bzero:
    .set push; .set mips4; pref 1, 0($4); .set pop
    sltiu $8, $6, 4
    bnez $8, .Lsmall_memset2
    andi $8, $4, 3
    beqz $8, 1f
    subu $8, 4
9:  swr $5, ($4); .section __ex_table,"a"; .word 9b, .Lfirst_fixup; .previous
    subu $4, $8
    addu $6, $8
1:  ori $9, $6, 0x3f
    xori $9, 0x3f
    beqz $9, .Lmemset2_partial
    andi $8, $6, 0x40-4
    addu $9, $4
    .set reorder
    subu $10, $9, $4
    sltu $11, $10, 64
    bnez $11, 1f    
    .set push; .set mips4; pref 30, 32($4); .set pop
    sltu $11, $10, 128
    bnez $11, 1f
    .set push; .set mips4; pref 30, 64($4); .set pop
    .set push; .set mips4; pref 30, 96($4); .set pop
    sltu $11, $10, 192
    bnez $11, 1f
2:
    .set push; .set mips4; pref 30, 128($4); .set pop
    .set push; .set mips4; pref 30, 160($4); .set pop

1:  addiu $4, 64
    f_fill64 $4, -64, $5, .Lfwd_fixup
    subu $10, $9, $4
    sltu $11, $10, 192
    beqz $11, 2b
    bne $9, $4, 1b
    .set noreorder

.Lmemset2_partial:
    la $9, 2f
    subu $9, $8
    jr $9
    addu $4, $8
    .set push
    .set noreorder
    .set nomacro
    f_fill64 $4, -64, $5, .Lpartial_fixup
2:  .set pop
    andi $6, 3
    beqz $6, 1f
    addu $4, $6
9:  swl $5, -1($4); .section __ex_table,"a"; .word 9b, .Llast_fixup; .previous
1:  jr $31
    move $6, $0

.Lsmall_memset2:
    beqz $6, 2f
    addu $9, $4, $6
1:  addiu $4, 1
    bne $9, $4, 1b
    sb $5, -1($4)
2:  jr $31
    move $6, $0
    .end memset2; .size memset2, .-memset2

.Lfirst_fixup:
    jr $31
    nop

.Lfwd_fixup:
    lw $8, 0($28)
    lw $8, 880($8)
    andi $6, 0x3f
    addu $6, $9
    jr $31
    subu $6, $8

.Lpartial_fixup:
    lw $8, 0($28)
    lw $8, 880($8)
    andi $6, 3
    addu $6, $9
    jr $31
    subu $6, $8

.Llast_fixup:
    jr $31
    andi $3, $6, 3