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[flang][NFC] Document intentional non-support for an extension

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F18 doesn't accept INTEGER operands to the intrinsic LOGICAL operations;
some compilers do.  This usage is not portable, and not just because it's
non-conforming -- the bit representations of LOGICAL also vary between
compilers and options.  The "MIL-STD" bit intrinsics IAND() & al. have been
avaiable since the late 70's and should be used instead.

Differential Revision: https://reviews.llvm.org/D126798
This commit is contained in:
Peter Klausler
2022-06-01 11:05:55 -07:00
parent 0426100ff4
commit f2ee0a3f2c
1 changed files with 2 additions and 0 deletions
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flang/docs/Extensions.md
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@@ -282,6 +282,8 @@ end
* USE association of a procedure interface within that same procedure's definition
* NULL() as a structure constructor expression for an ALLOCATABLE component (PGI).
* Conversion of LOGICAL to INTEGER in expressions.
* Use of INTEGER data with the intrinsic logical operators `.NOT.`, `.AND.`, `.OR.`,
and `.XOR.`.
* IF (integer expression) THEN ... END IF (PGI/Intel)
* Comparsion of LOGICAL with ==/.EQ. rather than .EQV. (also .NEQV.) (PGI/Intel)
* Procedure pointers in COMMON blocks (PGI/Intel)