Hi,
> http://www.keil.com/support/man/docs/armasm/armasm_dom1361289902800.htm
>From this piece code: (ftcalc.c +244)
return (int32_t)( ( ab + 0x8000L - ( ab < 0 ) ) >> 16 );
this routine seems produce a result of a integer include the bit 16 to bit
(16+32)
and round up?
Greater than one half --> +1
Less than one half --> discard
FT_MulFix a b
a x b become a 64bit interger.
a x b:|B7|B6|B5|B4|B3|B2|B1|B0|
|xx|xx|B5|B4|B3|B2|xx|xx|
If(|B1|B0| > 0x10000/2)
|B5|B4|B3|B2| += 1
----->return |B5|B4|B3|B2|
Am I understand this right?
Regards,
duhuanpeng
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