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The problem here is we try calling find_widening_optab_handler_and_mode with to_mode=E_USAmode and from_mode=E_UHQmode. This causes an ICE (with checking only). The fix is to reject the case where the mode classes are different in convert_plusminus_to_widen before even trying to deal with the modes. Bootstrapped and tested on x86_64-linux-gnu. PR tree-optimization/119568 gcc/ChangeLog: * tree-ssa-math-opts.cc (convert_plusminus_to_widen): Reject different mode classes. Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>
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