tree fa767796b0c6880338bf8c4d3a724e969f4f7031
parent 8906a0fe64abf1a9c8641ee51908bba7cbf8ec54
author Fabian Wolff <fabian.wolff@alumni.ethz.ch> 1638228729 -0800
committer Philip Reames <listmail@philipreames.com> 1638228729 -0800

[CVP] Remove ashr of -1 or 0

Fixes PR#52190. There is already a check for converting ashr instructions with non-negative left-hand sides into lshr; this patch adds an optimization to remove ashr altogether if the left-hand side is known to be in the range [-1, 1).

Differential Revision: https://reviews.llvm.org/D113835