MVBITS (The GNU Fortran Compiler) (original) (raw)
8.203 MVBITS — Move bits from one integer to another ¶
Synopsis:
CALL MVBITS(FROM, FROMPOS, LEN, TO, TOPOS)
Description:
Moves LEN bits from positions FROMPOS throughFROMPOS+LEN-1 of FROM to positions TOPOS throughTOPOS+LEN-1 of TO. The portion of argument TO not affected by the movement of bits is unchanged. The values ofFROMPOS+LEN-1 and TOPOS+LEN-1 must be less thanBIT_SIZE(FROM).
Class:
Elemental subroutine
Arguments:
| FROM | The type shall be INTEGER or UNSIGNED. |
|---|---|
| FROMPOS | The type shall be INTEGER. |
| LEN | The type shall be INTEGER. |
| TO | The type shall be of the same type and kind as FROM. |
| TOPOS | The type shall be INTEGER. |
Specific names:
| Name | Argument | Return type | Standard |
|---|---|---|---|
| MVBITS(A) | INTEGER A | INTEGER | Fortran 90 and later |
| BMVBITS(A) | INTEGER(1) A | INTEGER(1) | GNU extension |
| IMVBITS(A) | INTEGER(2) A | INTEGER(2) | GNU extension |
| JMVBITS(A) | INTEGER(4) A | INTEGER(4) | GNU extension |
| KMVBITS(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:
IBCLR — Clear bit,
IBSET — Set bit,
IBITS — Bit extraction,
IAND — Bitwise logical and,
IOR — Bitwise logical or,
IEOR — Bitwise logical exclusive or