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Author SHA1 Message Date
Philip Reames e499bc3042 [instsimplify] consistently handle undef and out of bound indices for insertelement and extractelement 
In one case, we were handling out of bounds, but not undef indices.  In the other, we were handling undef (with the comment making the analogy to out of bounds), but not out of bounds.  Be consistent and treat both undef and constant out of bounds indices as producing undefined results.

As a side effect, this also protects instcombine from having to handle large constant indices as we always simplify first.

llvm-svn: 321575
 2017-12-30 05:54:22 +00:00
Philip Reames 8e1abe4a7d Add another test case for r321489 
Went to reduce another fuzzer failure to find it's already been fixed, but the test case is slightly different so it's worth adding anyways.

Reduced from oss-fuzz #4768 test case

llvm-svn: 321573
 2017-12-30 04:10:48 +00:00
Simon Pilgrim e7d032f1d8 [InstCombine] Gracefully handle out of range extractelement indices 
InstSimplify is responsible for handling these, but we shouldn't just assert here.

Reduced from oss-fuzz #4808 test case

llvm-svn: 321489
 2017-12-27 12:00:18 +00:00