參數(shù)資料
型號: ARM966E-S
英文描述: ARM966E-S Microprocessor Core preliminary technical manual 6/01
中文描述: ARM966E - ?微處理器核的初步技術(shù)手冊6月1日
文件頁數(shù): 143/166頁
文件大?。?/td> 1145K
代理商: ARM966E-S
A-3
Rev. A
Copyright 1999-2001 by LSI Logic Corporation. All rights reserved.
CLZ
Count Leading Zeros
Format
CLZ{cond} Rd, Rm
Description
This operation returns the number of leading zeros in the register Rm
into the destination register Rd. This operation was originally defined as
part of the ARMv5T instruction set extensions. It is mentioned here
because CLZ is supported in an ARM9E-compatible processor
regardless of whether that processor also supports the full ARMv5
instruction set. Used for speeding up the normalization at the start of a
Newton-Raphson based division and normalization of fixed-point
numbers.
Operation
if (Rm == 0)
Rd = 32
else
for (i = 31; i >= 0; i--) {
if (Rm[i] == 1) then
Rd = 31 – i
break
}
Exceptions
None
Qualifiers
Condition Code
Notes
Writing to R15:
Specifying R15 (PC) for register Rd or Rm is
UNPREDICTABLE.
31
28 27 26 25 24 23 22 21 20 19
16 15
12 11
8
7
6
5
4
3
0
cond
0
0
0
1
0
1
1
0
SBZ
Rd
SBZ
0
0
0
1
Rm
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