Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS VOLUME 3 REV 2.3, Руководство пользователя

Страница: 1424 / 1898

4:122 Volume 4: Base IA-32 Instruction Reference
FDIV/FDIVP/FIDIV—Divide (Continued)
Notes:
Fmeans finite-real number.
Imeans integer.
*indicates floating-point invalid-arithmetic-operand (#IA) exception.
**indicates floating-point zero-divide (#Z) exception.
Operation
IF SRC

0
THEN
#Z
ELSE
IF instruction is FIDIV
THEN
DEST

DEST

ConvertExtendedReal(SRC);
ELSE (* source operand is real number *)
DEST

DEST

SRC;
FI;
FI;
IF instruction = FDIVP
THEN
PopRegisterStack
FI;
FPU Flags Affected
C1 Set to 0 if stack underflow occurred.
Indicates rounding direction if the inexact-result exception (#P) is
generated: 0 = not roundup; 1 = roundup.
C0, C2, C3 Undefined.
DEST
-•

F

0 +0 +F +

NaN
-

* +0 +0

0

0 * NaN

F +

+F +0

0

F -• NaN

I +

+F +0

0

F -• NaN
SRC

0 +

** * * ** -• NaN
+0 -• ** * * ** +

NaN
+I -•

F

0 +0 +F +

NaN
+F -•

F

0 +0 +F +

NaN
+

*

0

0 +0 +0 * NaN
NaN NaN NaN NaN NaN NaN NaN NaN