IBITS (The GNU Fortran Compiler) (original) (raw)
Synopsis:
RESULT = IBITS(I, POS, LEN)
Description:
IBITS extracts a field of length LEN from I, starting from bit position POS and extending left for LENbits. The result is right-justified and the remaining bits are zeroed. The value of POS+LEN must be less than or equal to the value BIT_SIZE(I).
Class:
Elemental function
Arguments:
| I | The type shall be INTEGER or UNSIGNED. |
|---|---|
| POS | The type shall be INTEGER. |
| LEN | The type shall be INTEGER. |
Return value:
The return value is of type as I.
Specific names:
| Name | Argument | Return type | Standard |
|---|---|---|---|
| IBITS(A) | INTEGER A | INTEGER | Fortran 90 and later |
| BBITS(A) | INTEGER(1) A | INTEGER(1) | GNU extension |
| IIBITS(A) | INTEGER(2) A | INTEGER(2) | GNU extension |
| JIBITS(A) | INTEGER(4) A | INTEGER(4) | GNU extension |
| KIBITS(A) | INTEGER(8) A | INTEGER(8) | GNU extension |
Standard:
Fortran 90 and later, has overloads that are GNU extensions. Extension for UNSIGNED (see Unsigned integers)
See also:
BIT_SIZE — Bit size inquiry function,
IBCLR — Clear bit,
IBSET — Set bit,
IAND — Bitwise logical and,
IOR — Bitwise logical or,
IEOR — Bitwise logical exclusive or