Type variants for integer intrinsics (The GNU Fortran Compiler)

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6.1.24 Type variants for integer intrinsics ¶

Similar to the D/C prefixes to real functions to specify the input/output types, GNU Fortran offers B/I/J/K prefixes to integer functions for compatibility with DEC programs. The types implied by each are:

B - INTEGER(kind=1)
I - INTEGER(kind=2)
J - INTEGER(kind=4)
K - INTEGER(kind=8)

GNU Fortran supports these with the flag -fdec-intrinsic-ints. Intrinsics for which prefixed versions are available and in what form are noted in Intrinsic Procedures. The complete list of supported intrinsics is here:

Intrinsic	B	I	J	K
`ABS — Absolute value`	`BABS`	`IIABS`	`JIABS`	`KIABS`
`BTEST — Bit test function`	`BBTEST`	`BITEST`	`BJTEST`	`BKTEST`
`IAND — Bitwise logical and`	`BIAND`	`IIAND`	`JIAND`	`KIAND`
`IBCLR — Clear bit`	`BBCLR`	`IIBCLR`	`JIBCLR`	`KIBCLR`
`IBITS — Bit extraction`	`BBITS`	`IIBITS`	`JIBITS`	`KIBITS`
`IBSET — Set bit`	`BBSET`	`IIBSET`	`JIBSET`	`KIBSET`
`IEOR — Bitwise logical exclusive or`	`BIEOR`	`IIEOR`	`JIEOR`	`KIEOR`
`IOR — Bitwise logical or`	`BIOR`	`IIOR`	`JIOR`	`KIOR`
`ISHFT — Shift bits`	`BSHFT`	`IISHFT`	`JISHFT`	`KISHFT`
`ISHFTC — Shift bits circularly`	`BSHFTC`	`IISHFTC`	`JISHFTC`	`KISHFTC`
`MOD — Remainder function`	`BMOD`	`IMOD`	`JMOD`	`KMOD`
`NOT — Logical negation`	`BNOT`	`INOT`	`JNOT`	`KNOT`
`REAL — Convert to real type`	`--`	`FLOATI`	`FLOATJ`	`FLOATK`