r251510 - in /trunk/gcc: ChangeLog combine.c

[rsandifo@gcc.gnu.org]

Author: rsandifo
Date: Wed Aug 30 11:18:29 2017
New Revision: 251510

URL: https://gcc.gnu.org/viewcvs?rev=251510&root=gcc&view=rev
Log:
[58/77] Use scalar_int_mode in a try_combine optimisation

This patch uses scalar_int_modes for:

  /* If I2 is setting a pseudo to a constant and I3 is setting some
     sub-part of it to another constant, merge them by making a new
     constant.  */

This was already implicit, but the danger with checking only
CONST_SCALAR_INT_P is that it can include CC values too.

2017-08-30  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* combine.c (try_combine): Use is_a <scalar_int_mode> when
	trying to combine a full-register integer set with a subreg
	integer set.

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