tree 5edc3ccd19ae65e6efb25db3fe8fffaf72047e8b
parent 643c3b73d6365d1bfaf22bd899976f4f6eac8491
author peter klausler <pklausler@nvidia.com> 1615585231 -0800
committer Copybara-Service <copybara-worker@google.com> 1616051956 -0700

[flang] Runtime: implement INDEX intrinsic function

Implement INDEX in the runtime, reusing some infrastructure
(with generalization and renaming as needed) put into place
for its cousins SCAN and VERIFY.

I did not implement full Boyer-Moore substring searching
for the forward case, but did accelerate some advancement on
mismatches.

I (re)implemented unit testing for INDEX in the new gtest
framework, combining it with the tests that have recently
been ported to gtest for SCAN and VERIFY.

Differential Revision: https://reviews.llvm.org/D98553

GitOrigin-RevId: 6811b961000fea84b44a225162ffa6cd434e1d63