[flang-commits] [PATCH] D126798: [flang][NFC] Document intentional non-support for an extension

[Peter Klausler via Phabricator via flang-commits]

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F18 <https://reviews.llvm.org/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.


https://reviews.llvm.org/D126798

Files:
  flang/docs/Extensions.md


Index: flang/docs/Extensions.md
===================================================================
--- flang/docs/Extensions.md
+++ flang/docs/Extensions.md
@@ -282,6 +282,8 @@
 * 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)


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