Excalibur electronic A-MNL-NIOSPROG-01.1 用户手册
50
Altera Corporation
32-Bit Instruction Set
EXT8s
Byte-Extract (Static)
Operation:
RA
← (0x00.00.00 :
bn
RA) where n = IMM2
Assembler Syntax:
EXT8s %rA,IMM2
Example:
EXT8s %g6,3 ; %g6 gets the 3rd byte of itself
Description:
Extracts one of the four bytes in RA. The byte to-be-extracted is chosen by the
immediate value IMM2 (byte 3 being the most-significant byte of RA). The
selected byte is written into bits 7..0 of RA, and the more-significant bits 31..8 are
selected byte is written into bits 7..0 of RA, and the more-significant bits 31..8 are
set to zero.
Condition Codes:
Flags: Unaffected
Instruction Format:
Ri2u
Instruction Fields:
A = Register index of operand RA
IMM2 = 2-bit immediate value
IMM2 = 2-bit immediate value
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
1
1
1
0
1
0
0
0
IMM2
A
N
V
Z
C
−
−
−
−