r274512 - in /trunk/gcc: ChangeLog config/aarch...

[rsandifo@gcc.gnu.org]

Author: rsandifo
Date: Thu Aug 15 08:29:11 2019
New Revision: 274512

URL: https://gcc.gnu.org/viewcvs?rev=274512&root=gcc&view=rev
Log:
[AArch64] Use SVE reversed shifts in preference to MOVPRFX

This patch makes us use reversed SVE shifts when the first operand
can't be tied to the output but the second can.  This is tested
more thoroughly by the ACLE patches but is really an independent
improvement.

2019-08-15  Richard Sandiford  <richard.sandiford@arm.com>
	    Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

gcc/
	* config/aarch64/aarch64-sve.md (*v<ASHIFT:optab><SVE_I:mode>3):
	Add an alternative that uses reversed shifts.

gcc/testsuite/
	* gcc.target/aarch64/sve/shift_1.c: Accept reversed shifts.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/aarch64/aarch64-sve.md
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.target/aarch64/sve/shift_1.c