AMD-K6 datasheet(45/346 Pages) AMD

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Chapter 3

Software Environment

20695H/0—March 1998

AMD-K6® Processor Data Sheet

Preliminary Information

The FPU control word register allows a programmer to manage

the FPU processing options. Figure 12 shows the format of this

Figure 12. FPU Control Word Register

The FPU tag word register contains information about the

registers in the register stack. Figure 13 shows the format of this

Figure 13. FPU Tag Word Register

Symbol

Description

Bits

Infinity Bit (80287 compatibility) 12

Rounding Control

11–10

Precision Control

9–8

Exception Masks

Precision

Underflow

Overflow

Zero Divide

Denormalized Operation

Invalid Operation

9 8

654

3210

Rounding Control Information

00b = Round to the nearest or even number

01b = Round down toward negative infinity

10b = Round up toward positive infinity

11b = Truncate toward zero

Reserved

Precision Control Information

00b = 24 bits Single Precision Real

01b = Reserved

10b = 53 bits Double Precision Real

11b = 64 bits Extended Precision Real

8765

432

TAG

(FPR6

TAG

(FPR7

TAG

(FPR4

TAG

(FPR5

TAG

(FPR2

TAG

(FPR3

TAG

(FPR0

TAG

(FPR1

Tag Values

00 = Valid

01 = Zero

10 = Special

11 = Empty

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