Syntax:

• FTOI Rd3 BS Rs0

Description:

The FTOI (float to integer) instruction interprets the data stored on the two banks of register Rs0 as double precision (64-bits) floating point numbers, and yields the integral parts of these numbers in a 64-bit integer representation. The result is then written to register Rd3 according to the bank select Bs3. The data on Rs0 is accessed through Port0 of the register file, and the result is written via Port3 of the register file. It is to be noted that, in case of overflow, i.e., when the exact integral representation of a double precision floating point number requires more than 64 bits, the result returned is either 0x7FFFFFFFFFFFFFFF (the maximum 64-bit integer), or 0x800000000000000 (the minimum 64-bit integer), depending on the sign of the floating point number. This effect is shown in the following table, where the middle column refers to an infinite integer representation, and the last column refers to the result obtained with FTOI:

Double	Integer (infinite bits)	Integer (64-bits)
0x43DFFFFFFFFFFFFE	0x..007FFFFFFFFFFFF800	0x7FFFFFFFFFFFF800
0x43DFFFFFFFFFFFFF	0x..007FFFFFFFFFFFFC00	0x7FFFFFFFFFFFFC00
0x43E0000000000000	0x..008000000000000000	0x7FFFFFFFFFFFFFFF
0x43E0000000000001	0x..008000000000000800	0x7FFFFFFFFFFFFFFF
0x43E0000000000001	0x..008000000000000800	0x7FFFFFFFFFFFFFFF
0xC3DFFFFFFFFFFFFE	0x..FF8000000000000800	0x8000000000000800
0xC3DFFFFFFFFFFFFF	0x..FF8000000000000400	0x8000000000000400
0xC3E0000000000000	0x..FF8000000000000000	0x8000000000000000
0xC3E0000000000001	0x..FF7FFFFFFFFFFFF800	0x8000000000000000

Microcode Pattern:

Takes 6 cycles to execute.
    Example: FTOI 0xB 2 0xA

	  
MPC BS3 C3 P3 P2 P1 P0
----------------------
F2I  0   0 00 00 00 0a
 -   0   0 00 00 00 00
 -   0   0 00 00 00 00
 -   0   0 00 00 00 00
 -   0   0 00 00 00 00
 -   2   0 0b 00 00 00

	  

Exceptions :

Configuration Register: 0x30 (CrFiluExc)

[0]	00000000 00000001	AluBadOpL
[1]	00000000 00000002	AluBadOpH
[2]	00000000 00000004	AluDenInL
[3]	00000000 00000008	AluDenInH

Example :

FTOI 0xB 2 0xA
	!! writes the integer representation of the high 
	!! bank of register 0xa into the high bank of 
	!! register 0xb (Note: Bs3 = 2, high)