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The following patch adjusts simplify_rotate to recognize more rotates, basically we allow even some same precision integral -> integral conversions, with the requirement that the RSHIFT_EXPR operand has to be done in unsigned type (i.e. logical right shift), so that we compensate for the combiner no longer being able to simplify those into rotates on some targets. 2020-03-31 Jakub Jelinek <jakub@redhat.com> PR rtl-optimization/94344 * tree-ssa-forwprop.c (simplify_rotate): Handle also same precision conversions, either on both operands of |^+ or just one. Handle also extra same precision conversion on RSHIFT_EXPR first operand provided RSHIFT_EXPR is performed in unsigned type. * gcc.dg/pr94344.c: New test.
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