On Sat, 6 May 2023, Roger Sayle wrote: > An analysis of backend UNSPECs reveals that two of the most common UNSPECs > across target backends are for copysign and bit reversal. This patch > adds RTX codes for these expressions to allow their representation to > be standardized, and them to optimized by the middle-end RTL optimizers.
Note we have bug 50481 requesting (target-independent) built-in functions for bit reversal (so this patch could be useful as a basis for implementing such built-in functions, with appropriate lowering or libgcc implementation for targets without relevant instructions). -- Joseph S. Myers jos...@codesourcery.com
