[PATCH] D28308: [SCEV] Model ashr(shl(x, n), m) as mul(x, 2^(n-m)) when n > m

[Z. Zheng via Phabricator via llvm-commits]

zzheng updated this revision to Diff 91202.
zzheng added a comment.

Removed ashr (X, C) -> sext(truc(udiv(X, 1<<C))) from previous revision.
This is causing a test failure and needs more work. I'd like to do it in another patch.


Repository:
  rL LLVM

https://reviews.llvm.org/D28308

Files:
  lib/Analysis/ScalarEvolution.cpp
  test/Analysis/ScalarEvolution/sext-mul.ll
  test/Analysis/ScalarEvolution/sext-zero.ll

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