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[flang] Document non-standard use of larger INTEGER for sizes 

Original-commit: flang-compiler/f18@edc79c4257
Reviewed-on: https://github.com/flang-compiler/f18/pull/553
Tree-same-pre-rewrite: false
This commit is contained in:
peter klausler 2019-07-08 10:44:14 -07:00
parent cc2172b6f4
commit 626a4cfdfc
1 changed files with 11 additions and 0 deletions
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flang/documentation/Extensions.md
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@ -12,6 +12,17 @@ Other non-standard features, which do conflict with the current
standard specification of the Fortran programming language, are standard specification of the Fortran programming language, are
accepted if enabled by command-line options. accepted if enabled by command-line options.
Intentional violations of the standard
======================================
* The default `INTEGER` type is required by the standard to occupy
the same amount of storage as the default `REAL` type. Default
`REAL` is of course 32-bit IEEE-754 floating-point today. This legacy
rule imposes an artificially small constraint in some cases
where Fortran mandates that something have the default `INTEGER`
type: array bounds, `CHARACTER` length, subscripts, and the results
of intrinsic function references that return such things. We
use `INTEGER(KIND=8)` for such things.
Extensions, deletions, and legacy features supported by default Extensions, deletions, and legacy features supported by default
=============================================================== ===============================================================
* Tabs in source * Tabs in source