> This also eliminate quite a few zero-extensions in the compile.exp testsuite > at -O2 on the SPARC. Tested on x86-64/Linux and SPARC/Solaris. > > > 2016-11-07 Eric Botcazou <ebotca...@adacore.com> > > PR rtl-optimization/59461 > * doc/rtl.texi (paradoxical subregs): Add missing word. > * combine.c (reg_nonzero_bits_for_combine): Do not discard results > in modes with precision larger than that of last_set_mode. > * rtlanal.c (nonzero_bits1) <SUBREG>: If WORD_REGISTER_OPERATIONS is > set and LOAD_EXTEND_OP is appropriate, propagate results from inner > REGs to paradoxical SUBREGs. > (num_sign_bit_copies1) <SUBREG>: Likewise. Check that the mode is not > larger than a word before invoking LOAD_EXTEND_OP on it.
I have installed it after testing on ARM/EABI and IA-64/Linux. -- Eric Botcazou
