參數(shù)資料
型號: 20726
英文描述: 3DNow!? Technology Manual AMD-K6 Processor Multimedia Technology
中文描述: 3DNow???技術(shù)手冊的AMD - K6處理器多媒體技術(shù)
文件頁數(shù): 19/120頁
文件大?。?/td> 1284K
代理商: 20726
Programming Considerations
13
20726D/0—January 2000
AMD-K6 MMX Enhanced Processor Multimedia Technology
Preliminary Information
Exceptions
Table 1 contains a list of exceptions that MMX instructions can
generate.
The rules for exceptions have not changed in the
implementation of MMX instructions. None of the exception
handlers need to be modified.
Note:
1. An invalid opcode exception interrupt 6 occurs if an MMX
instruction is executed on a processor that does not
support MMX instructions.
2. If a floating-point exception is pending and the processor
encounters an MMX instruction, FERR# is asserted and, if
CR0.NE = 1, an interrupt 16 is generated.
Table 1.
MMX
Instruction Exceptions
Virtual
8086
Invalid opcode (6)
X
Exception
Real
Protected
X
Description
X
The emulate MMX instruction bit (EM) of the control
register (CR0) is set to 1.
Save the floating-point or MMX state if the task switch
bit (TS) of the control register (CR0) is set to 1.
During instruction execution, the stack segment limit
was exceeded.
During instruction execution, the effective address of
one of the segment registers used for the operand
points to an illegal memory location.
One of the instruction data operands falls outside the
address range 00000h to 0FFFFh.
A page fault resulted from the execution of the
instruction.
An exception is pending due to the floating-point
execution unit.
An unaligned memory reference resulted from the
instruction execution, and the alignment mask bit
(AM) of the control register (CR0) is set to 1. (In
Protected Mode, CPL = 3.)
Device not available (7)
X
X
X
Stack exception (12)
X
X
X
General protection (13)
X
Segment overrun (13)
X
X
Page fault (14)
X
X
Floating-point exception
pending (16)
Alignment check (17)
X
X
X
X
X
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