[all-commits] [llvm/llvm-project] e5f602: [ValueTracking] Let propagatesPoison support binop...

[Juneyoung Lee via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: e5f602d82ca05d113c725fdfff405dcb7c5470f5
      https://github.com/llvm/llvm-project/commit/e5f602d82ca05d113c725fdfff405dcb7c5470f5
  Author: Juneyoung Lee <aqjune at gmail.com>
  Date:   2020-05-13 (Wed, 13 May 2020)

  Changed paths:
    M llvm/include/llvm/Analysis/ValueTracking.h
    M llvm/lib/Analysis/ValueTracking.cpp
    M llvm/lib/Transforms/Instrumentation/PoisonChecking.cpp
    M llvm/test/Analysis/ScalarEvolution/nsw.ll
    M llvm/unittests/Analysis/ValueTrackingTest.cpp

  Log Message:
  -----------
  [ValueTracking] Let propagatesPoison support binops/unaryops/cast/etc.

Summary:
This patch makes propagatesPoison be more accurate by returning true on
more bin ops/unary ops/casts/etc.

The changed test in ScalarEvolution/nsw.ll was introduced by
https://github.com/llvm/llvm-project/commit/a19edc4d15b0dae0210b90615775edd76f021008 .
IIUC, the goal of the tests is to show that iv.inc's SCEV expression still has
no-overflow flags even if the loop isn't in the wanted form.
It becomes more accurate with this patch, so think this is okay.

Reviewers: spatel, lebedev.ri, jdoerfert, reames, nikic, sanjoy

Reviewed By: spatel, nikic

Subscribers: regehr, nlopes, efriedma, fhahn, javed.absar, llvm-commits, hiraditya

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D78615