Hi everyone, This patch fixes PR 50038 (redundant zero extensions) by modifying implicit-zee pass to also remove unneeded zero extensions from QImode to SImode. There is 6% improvement in rgbyiqv test from EEMBC 2.0 benchmark on x86-64. I am not sure if this is correct approach ( tom modify implicit-zee pass), so comments are welcome. Also if this aproach is correct we will need to enable implicit-zee pass on some new targets ( for example x86 32bit).
It passes bootstrap and make-check.
Here is a Changelog:
2011-09-27 Ilya Tocar <ilya.to...@intel.com>
* implicit-zee.c: Added 2011 to copyright.
(combine_set_zero_extend): Add QImode.
(merge_def_and_ze): Likewise.
(add_removable_zero_extend): Likewise.
(not_qi_to_si): New.
(make_defs_and_copies_lists): Add check for QImode.
zee.patch
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