Files
llvm/test/Transforms/InstCombine
Bjorn Pettersson c395575313 [InstCombine] Fix miscompile bug in canEvaluateShuffled
Summary:
Add restrictions in canEvaluateShuffled to prevent that we for example
transform

  %0 = insertelement <2 x i16> undef, i16 %a, i32 0
  %1 = srem <2 x i16> %0, <i16 2, i16 1>
  %2 = shufflevector <2 x i16> %1, <2 x i16> undef, <2 x i32> <i32 undef, i32 0>

into

   %1 = insertelement <2 x i16> undef, i16 %a, i32 1
   %2 = srem <2 x i16> %1, <i16 undef, i16 2>

as having an undef denominator makes the srem undefined (for all
vector elements).

Fixes: https://bugs.llvm.org/show_bug.cgi?id=43689

Reviewers: spatel, lebedev.ri

Reviewed By: spatel, lebedev.ri

Subscribers: lebedev.ri, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D69038

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375208 91177308-0d34-0410-b5e6-96231b3b80d8
2019-10-18 07:42:02 +00:00
..
2019-09-26 19:01:18 +00:00
2019-08-14 16:50:06 +00:00
2019-09-11 10:51:26 +00:00
2019-09-06 16:26:59 +00:00
2019-06-21 17:51:18 +00:00

This directory contains test cases for the instcombine transformation.  The
dated tests are actual bug tests, whereas the named tests are used to test
for features that the this pass should be capable of performing.