paulo@0: @ fixed fastfmul(fixed x, fixed y)
paulo@0: @ Multiply two 16.16 fixed-point numbers.
paulo@0: 
paulo@0: .ARM
paulo@0: .ALIGN
paulo@0: .GLOBL  fastfmul
paulo@0: 
paulo@0: fastfmul:
paulo@0:   smull r1,r2,r0,r1
paulo@0:   mov r0,r2,LSL#16
paulo@0:   orr r0,r0,r1,LSR#16
paulo@0:   bx lr
paulo@0: 
paulo@0: 
paulo@0: @ int dv(int num, int den)
paulo@0: @ Divide two signed integers.
paulo@0: 
paulo@0: .THUMB
paulo@0: .THUMB_FUNC
paulo@0: .ALIGN
paulo@0: .GLOBL  dv
paulo@0: 
paulo@0: dv:
paulo@0:   cmp r1, #0
paulo@0:   beq 0f
paulo@0:   swi 6
paulo@0:   bx lr
paulo@0: 0:
paulo@0:   ldr r0, =0x7fffffff
paulo@0:   bx lr
paulo@0: 
paulo@0: 
paulo@0: @ int fracmul(signed int x, signed int frac)
paulo@0: @ Multiply by a 0.32 fractional number between -0.5 and 0.5.
paulo@0: @ Used for fast division by a constant.
paulo@0: 
paulo@0: .ARM
paulo@0: .ALIGN
paulo@0: .GLOBL  fracmul
paulo@0: 
paulo@0: fracmul:
paulo@0:   smull r1,r2,r0,r1
paulo@0:   mov r0, r2
paulo@0:   bx lr
paulo@0: 
paulo@0: 
paulo@0: @ int fracumul(unsigned int x, unsigned int frac)
paulo@0: @ Multiply by a 0.32 fractional number between 0 and 1.
paulo@0: @ Used for fast division by a constant.
paulo@0: 
paulo@0: .ARM
paulo@0: .ALIGN
paulo@0: .GLOBL  fracumul
paulo@0: 
paulo@0: fracumul:
paulo@0:   umull r1,r2,r0,r1
paulo@0:   mov r0, r2
paulo@0:   bx lr
paulo@0: 
paulo@0: 
paulo@0: @ void gblz_unpack(const void *src, void *dst)
paulo@0: @ Unpack GB LZSS format data.
paulo@0: 
paulo@0: .THUMB
paulo@0: .THUMB_FUNC
paulo@0: .ALIGN
paulo@0: .GLOBL  _gblz_unpack
paulo@0: 
paulo@0: _gblz_unpack:
paulo@0:   swi 0x11  @ LZ77UnCompWRAM
paulo@0:   bx lr
paulo@0: 
paulo@0: