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https://github.com/RaySollium99/picodrive.git
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70357ce525
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@276 be3aeb3a-fb24-0410-a615-afba39da0efa
42 lines
1 KiB
ArmAsm
42 lines
1 KiB
ArmAsm
# vim:filetype=mips
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# only CLUT for now..
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.set noreorder # don't reorder any instructions
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.set noat # don't use $at
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# void amips_clut(unsigned short *dst, unsigned char *src, unsigned short *pal, int count)
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.global amips_clut
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amips_clut:
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srl $a3, 2
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amips_clut_loop:
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lbu $t0, 0($a1) # tried lw here, no improvement noticed
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lbu $t1, 1($a1)
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lbu $t2, 2($a1)
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lbu $t3, 3($a1)
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sll $t0, 1
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sll $t1, 1
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sll $t2, 1
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sll $t3, 1
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addu $t0, $a2
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addu $t1, $a2
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addu $t2, $a2
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addu $t3, $a2
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lhu $t0, 0($t0)
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lhu $t1, 0($t1)
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lhu $t2, 0($t2)
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lhu $t3, 0($t3)
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ins $t0, $t1, 16, 16 # ins rt, rs, pos, size - Insert size bits starting
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ins $t2, $t3, 16, 16 # from the LSB of rs into rt starting at position pos
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sw $t0, 0($a0)
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sw $t2, 4($a0)
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addiu $a0, 8
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addiu $a3, -1
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bnez $a3, amips_clut_loop
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addiu $a1, 4
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jr $ra
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nop
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