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r253717 - in /trunk/gcc: ChangeLog combine.c
- From: rsandifo at gcc dot gnu dot org
- To: gcc-cvs at gcc dot gnu dot org
- Date: Fri, 13 Oct 2017 09:58:23 -0000
- Subject: r253717 - in /trunk/gcc: ChangeLog combine.c
Author: rsandifo
Date: Fri Oct 13 09:58:23 2017
New Revision: 253717
URL: https://gcc.gnu.org/viewcvs?rev=253717&root=gcc&view=rev
Log:
Prevent invalid register mode changes in combine
This patch stops combine from changing the mode of an existing register
in-place if doing so would change the size of the underlying register
allocation size, as given by REGMODE_NATURAL_SIZE. Without this,
many tests fail in adjust_reg_mode after SVE is added. One example
is gcc.c-torture/compile/20090401-1.c.
2017-10-13 Richard Sandiford <richard.sandiford@linaro.org>
Alan Hayward <alan.hayward@arm.com>
David Sherwood <david.sherwood@arm.com>
gcc/
* combine.c (can_change_dest_mode): Reject changes in
REGMODE_NATURAL_SIZE.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/combine.c