This is the mail archive of the gcc-cvs@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

r242812 - in /trunk/gcc: ChangeLog combine.c


Author: segher
Date: Wed Nov 23 23:30:38 2016
New Revision: 242812

URL: https://gcc.gnu.org/viewcvs?rev=242812&root=gcc&view=rev
Log:
combine: Query can_change_dest_mode before changing dest mode

As reported in https://gcc.gnu.org/ml/gcc-patches/2016-11/msg02388.html .

Changing the mode of a hard register can lead to problems, or at least
it can make worse code if the result will need reloads.


	* combine.c (change_zero_ext): Only change the mode of a hard register
	destination if can_change_dest_mode holds for that.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/combine.c


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]