peter klausler c375ec8613 [flang] Use a "double-double" accumulator in SUM ...

Use a "double-double" accumulator, a/k/a Kahan summation,
in the SUM intrinsic in the runtime for real & complex.
This seems to be the best-recommended technique for reducing
error, as opposed to the initial implementation of SUM's
distinct accumulators for positive and negative items.

Differential Revision: https://reviews.llvm.org/D104338

2021-06-16 14:29:39 -07:00

7.1 KiB

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