Justin Bogner 08154bf3d2 IR: Make the X / undef -> undef fold match the comment ...

The constant folding for sdiv and udiv has a big discrepancy between the
comments and the code, which looks like a typo. Currently, we're folding
X / undef pretty inconsistently:

  0 / undef -> undef
  C / undef -> 0
  undef / undef -> 0

Whereas the comments state we do X / undef -> undef. The logic that
returns zero is actually commented as doing undef / X -> 0, despite that
the LHS isn't undef in many of the cases that hit it.

llvm-svn: 261813

2016-02-25 01:02:18 +00:00

91 KiB

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