Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 4 REV 2.3 Manual page 132

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