tree 83971b6962a291b43e2afbbac0a3ade988ff489a
parent 576cde25aa05205662863d9a9b67a92fa134a67c
author Joseph Huber <jhuber6@vols.utk.edu> 1611761641 -0500
committer Copybara-Service <copybara-worker@google.com> 1613733705 -0800

[LV] Add analysis remark for mixed precision conversions

Floating point conversions inside vectorized loops have performance
implications but are very subtle. The user could specify a floating
point constant, or call a function without realizing that it will
force a change in the vector width. An example of this behaviour is
seen in https://godbolt.org/z/M3nT6c . The vectorizer should indicate
when this happens becuase it is most likely unintended behaviour.

This patch adds a simple check for this behaviour by following floating
point stores in the original loop and checking if a floating point
conversion operation occurs.

Reviewed By: fhahn

Differential Revision: https://reviews.llvm.org/D95539

GitOrigin-RevId: c3a3d200932347837283019a3870f185734f702d