參數(shù)資料
型號: 21928
英文描述: Low-Frequency, Spread-Spectrum EconOscillator
中文描述: 的AMD - K6 - 2E處理器數(shù)據(jù)手冊3DNow!?技術(shù)手冊
文件頁數(shù): 70/72頁
文件大?。?/td> 845K
代理商: 21928
60
Division and Square Root
Chapter 3
3DNow! Technology Manual
21928G/0—March 2000
X
0
= PFRCP(b)
X
1
= PFRCPIT1(b, X
0
)
X
2
= PFRCPIT2(X
1
, X
0
)
q = PFMUL(a, X
2
)
The 24-bit final reciprocal value is X
2
. In the AMD processor
implementation, the estimate contains the correct
round-to-nearest value for approximately 99% of all arguments.
The remaining arguments differ from the correct
round-to-nearest value for the reciprocal by 1
unit-in-the-last-place (ulp). The quotient is formed in the last
step by multiplying the reciprocal by the dividend a.
Divide Examples
These examples illustrate the use of 3DNow! instructions to
perform divides.
(14-Bit Precision)
MOVD
PFRCP
MOVQ
PFMUL
MM0, [mem]
MM0, MM0
MM2, [mem]
MM2, MM0
;
;
;
;
0 | w
1/w | 1/w
y | x
y/w | x/w
(approx.)
(24-Bit Precision)
MOVD
PFRCP
PUNPCKLDQ MM0, MM0
PFRCPIT1
MOVQ
PFRCPIT2
PFMUL
Note:
For a description of the PUNPCKLDQ instruction, see the
AMD-K6
Processor Multimedia Technology Manual, order#
20726.
MM0, [mem]
MM1, MM0
;
;
;
;
;
;
;
0 | w
1/w | 1/w
w | w
1/w | 1/w
y | x
1/w | 1/w
y/w | x/w
(approx.)
(MMX instruction)
(intermed.)
MM0, MM1
MM2, [mem]
MM0, MM1
MM2, MM0
(full prec.)
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