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[flang] Document extension: Ew.0 output editing

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The restrictions on the relationship between a "kP" scale factor
and a Ew.d/Dw.d/Gw.d significant digit count are not enforced for
output editing when there is no nonzero scale factor in effect.
(An error message about a bad scale factor is confusing if no kP
control edit descriptor has been used.)  Document this usage in
Extensions.md.

Differential Revision: https://reviews.llvm.org/D127435
This commit is contained in:
Peter Klausler 2022-06-08 15:52:46 -07:00
parent 6bab045d08
commit 89e4b75648
1 changed files with 2 additions and 0 deletions
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flang/docs/Extensions.md
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@ -233,6 +233,8 @@ end
* Legacy names `AND`, `OR`, and `XOR` are accepted as aliases for
the standard intrinsic functions `IAND`, `IOR`, and `IEOR`
respectively.
* A digit count of d=0 is accepted in Ew.0, Dw.0, and Gw.0 output
editing if no nonzero scale factor (kP) is in effect.
### Extensions supported when enabled by options