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PR tree-optimization/57157
* tree-ssa-forwprop.c (simplify_rotate): New function.
(ssa_forward_propagate_and_combine): Call it.
* c-c++-common/rotate-1.c: New test.
* c-c++-common/rotate-1a.c: New test.
* c-c++-common/rotate-2.c: New test.
* c-c++-common/rotate-2a.c: New test.
* c-c++-common/rotate-3.c: New test.
* c-c++-common/rotate-3a.c: New test.
* c-c++-common/rotate-4.c: New test.
* c-c++-common/rotate-4a.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@198769 138bc75d-0d04-0410-961f-82ee72b054a4
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