align

align none

Tells the compiler not to add padding bytes anywhere in common blocks or structures. This is the same as specifying noalign.

align arraynbyte

Aligns the start of arrays on an n-byte boundary. n can be 8, 16, 32, 64, 128, or 256. The default value for n is 8. This affects the starting alignment for all arrays except for arrays in COMMON.

Arrays do not have padding between their elements.

align commons

Aligns all common block entities on natural boundaries up to 4 bytes, by adding padding bytes as needed.

The align nocommons option adds no padding to common blocks. In this case, unaligned data can occur unless the order of data items specified in the COMMON statement places the largest numeric data item first, followed by the next largest numeric data (and so on), followed by any character data.

align dcommons

Aligns all common block entities on natural boundaries up to 8 bytes, by adding padding bytes as needed.

This option is useful for applications that use common blocks, unless your application has no unaligned data or, if the application might have unaligned data, all data items are four bytes or smaller. For applications that use common blocks where all data items are four bytes or smaller, you can specify align commons instead of align dcommons.

The align nodcommons option adds no padding to common blocks.

align qcommons

Aligns all common block entities on natural boundaries up to 16 bytes, by adding padding bytes as needed.

This option is useful for applications that use common blocks, unless your application has no unaligned data or, if the application might have u naligned data, all data items are eight bytes or smaller. For applications that use common blocks where all data items are eight bytes or smaller, you can specify align dcommons instead of align qcommons.

The align noqcommons option adds no padding to common blocks.

align zcommons

Aligns all common block entities on natural boundaries up to 32 bytes, by adding padding bytes as needed.

This option is useful for applications that use common blocks, unless your application has no unaligned data or, if the application might have unaligned data, all data items are 16 bytes or smaller. For applications that use common blocks where all data items are 16 bytes or smaller, you can specify align qcommons instead of align zcommons.

The align nozcommons option adds no padding to common blocks.

align norecords

Aligns components of derived types and fields within record structures on arbitrary byte boundaries with no padding.

The align records option requests that multiple data items in record structures and derived-type structures without the SEQUENCE statement be naturally aligned, by adding padding as needed.

align recnbyte

Aligns components of derived types and fields within record structures on the smaller of the size boundary specified (n) or the boundary that will naturally align them. n can be 1, 2, 4, 8, 16, or 32. The default value for n is 8. When you specify this option, each structure member after the first is stored on either the size of the member type or n-byte boundaries, whichever is smaller. For example, to specify 16 bytes as the packing boundary (or alignment constraint) for all structures and unions in the file prog1.f, use the following command:

ifort {-align rec16byte | /align:rec16byte} prog1.f

This option does not affect whether common blocks are naturally aligned or packed.

align sequence

Aligns components of a derived type declared with the SEQUENCE statement (sequenced components) according to the alignment rules that are currently in use. The default alignment rules are to align unsequenced components on natural boundaries.

The align nosequence option requests that sequenced components be packed regardless of any other alignment rules. Note that align none implies align nosequence.

If you specify an option for standards checking, align sequence is ignored.

align all

Tells the compiler to add padding bytes whenever possible to obtain the natural alignment of data items in common blocks, derived types, and record structures. Specifies align dcommons, align records, align nosequence. This is the same as specifying align with no keyword.