r251557 - in /trunk/gcc: ChangeLog config/aarch...

[rsandifo@gcc.gnu.org]

Author: rsandifo
Date: Thu Aug 31 10:11:41 2017
New Revision: 251557

URL: https://gcc.gnu.org/viewcvs?rev=251557&root=gcc&view=rev
Log:
[AArch64] Tighten address register subreg checks

Previously we allowed subregs of non-GPR modes to be base and index
registers in non-strict mode.  In practice such subregs will always
require a reload, so we get better code by disallowing them.

2017-08-31  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* config/aarch64/aarch64.c (aarch64_base_register_rtx_p): Only allow
	subregs whose inner modes can be stored in GPRs.
	(aarch64_classify_index): Likewise.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/aarch64/aarch64.c