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r242095 - /branches/ARM/sve-branch/gcc/cprop.c
- From: rsandifo at gcc dot gnu dot org
- To: gcc-cvs at gcc dot gnu dot org
- Date: Fri, 11 Nov 2016 16:58:31 -0000
- Subject: r242095 - /branches/ARM/sve-branch/gcc/cprop.c
Date: Fri Nov 11 16:58:31 2016
New Revision: 242095
Use df_read_modify_subreg_p in cprop.c
local_cprop_find_used_regs punted on all multiword registers,
with the comment:
/* Setting a subreg of a register larger than word_mode leaves
the non-written words unchanged. */
But this only applies if the outer mode is smaller than the
inner mode. If they're the same size then writes to the subreg
are a normal full update.
This patch uses df_read_modify_subreg_p instead. A later patch
adds more uses of the same routine, but this part had a (positive)
effect on code generation for the testsuite whereas the others
seemed to be simple clean-ups.