6da64f1b32
The patch to remove the vec_perm_const optab checked whether replacing a constant permute with a variable permute is safe, or whether it might truncate the indices. This patch adds a corresponding check for whether variable permutes can be lowered to QImode-based permutes. 2018-01-02 Richard Sandiford <richard.sandiford@linaro.org> gcc/ * optabs-query.c (can_vec_perm_var_p): Check whether lowering to qimode could truncate the indices. * optabs.c (expand_vec_perm_var): Likewise. From-SVN: r256094
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