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| author | Tobias Grosser <tobias@grosser.es> | 2016-11-10 06:45:28 +0000 |
|---|---|---|
| committer | Tobias Grosser <tobias@grosser.es> | 2016-11-10 06:45:28 +0000 |
| commit | 4d543d654a89047f4d08e5cbaa72c82076587aff (patch) | |
| tree | 37d62a07d55e334a10ea09228bd71ba63365b629 /clang/lib/Frontend/Rewrite/HTMLPrint.cpp | |
| parent | 0ae390abce6a12f3f334366769fb4fae9b142e5d (diff) | |
| download | bcm5719-llvm-4d543d654a89047f4d08e5cbaa72c82076587aff.tar.gz bcm5719-llvm-4d543d654a89047f4d08e5cbaa72c82076587aff.zip | |
SCEVValidator: add new parameters resulting from constant extraction
When extracting constant expressions out of SCEVs, new parameters may be
introduced, which have not been registered before. This change scans
SCEV expressions after constant extraction again to make sure newly
introduced parameters are registered.
We may for example extract the constant '8' from the expression '((8 * ((%a *
%b) + %c)) + (-8 * %a))' and obtain the expression '(((-1 + %b) * %a) + %c)'.
The new expression has a new parameter '(-1 + %b) * %a)', which was not
registered before, but must be registered to not crash.
This closes http://llvm.org/PR30953
Reported-by: Eli Friedman <efriedma@codeaurora.org>
llvm-svn: 286430
Diffstat (limited to 'clang/lib/Frontend/Rewrite/HTMLPrint.cpp')
0 files changed, 0 insertions, 0 deletions
