[PATCH 19/19][GCC-8] re PR target/90724 (ICE with __sync_bool_compare_and_swap with -march=armv8.2-a+sve)

[Andre Vieira (lists)]

2020-04-16  Andre Vieira <andre.simoesdiasvie...@arm.com>

    Backport from mainline
    2019-08-21  Prathamesh Kulkarni <prathamesh.kulka...@linaro.org>

    PR target/90724
    * config/aarch64/aarch64.c (aarch64_gen_compare_reg_maybe_ze): Force y
    in reg if it fails aarch64_plus_operand predicate.


diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 
6bac63402e508027e77a9f4557cb10c578ea7c2c..0da927be15c339295ef940d6e05a37e95135aa5a
 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -1574,6 +1574,9 @@ aarch64_gen_compare_reg_maybe_ze (RTX_CODE code, rtx x, 
rtx y,
        }
     }
 
+  if (!aarch64_plus_operand (y, y_mode))
+    y = force_reg (y_mode, y);
+
   return aarch64_gen_compare_reg (code, x, y);
 }