SRC (ST(0))
DEST (ST(0))
-
*
-F
*
-0
-0
+0
+0
+F
+F
+
+
NaN
NaN
Opcode |
Instruction |
Description |
|---|---|---|
|
D9 FA |
FSQRT |
Computes square root of ST(0) and stores the result in ST(0) |
Computes the square root of the source value in the ST(0) register and stores the result in ST(0).
The following table shows the results obtained when taking the square root of various classes of numbers, assuming that neither overflow nor underflow occurs.
SRC (ST(0)) |
DEST (ST(0)) |
|---|---|
|
- |
* |
|
-F |
* |
|
-0 |
-0 |
|
+0 |
+0 |
|
+F |
+F |
|
+ |
+ |
|
NaN |
NaN |
Note F Means finite-real number.
* Indicates floating-point invalid-arithmetic-operand (#IA) exception.
ST(0) 
SquareRoot(ST(0));
C1 - Set to 0 if stack underflow occurred. Indicates rounding direction if inexact-result exception (#P) is generated:
0 not roundup; 1 roundup.
C0, C2, C3 - Undefined.
#IS - Stack underflow occurred.
#IA - Source operand is an SNaN value or unsupported format. Source operand is a negative value (except for -0).
#D - Source operand is a denormal value.
#P - Value cannot be represented exactly in destination format.
#NM - EM or TS in CR0 is set.
#NM - EM or TS in CR0 is set.
#NM - EM or TS in CR0 is set.