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Richard Biener 84f4954c38 tree-optimization/95049 - fix not terminating RPO VN iteration
This rejects lattice changes from one constant to another.

2020-05-11  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/95049
	* tree-ssa-sccvn.c (set_ssa_val_to): Reject lattice transition
	between different constants.

	* gcc.dg/torture/pr95049.c: New testcase.
2020-05-11 17:56:31 +02:00
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