aarch64.c (aarch_macro_fusion_pair_p): Check prev_set and curr_set for AARCH64_FUSE_ALU_BRANCH.

2017-07-07  Andrew Pinski  <apinski@cavium.com>

        * config/aarch64/aarch64.c (aarch_macro_fusion_pair_p): Check
        prev_set and curr_set for AARCH64_FUSE_ALU_BRANCH.

From-SVN: r250068

gcc/ChangeLog

+2017-07-07  Andrew Pinski  <apinski@cavium.com>
+
+	* config/aarch64/aarch64.c (aarch_macro_fusion_pair_p): Check
+	prev_set and curr_set for AARCH64_FUSE_ALU_BRANCH.
+
 2017-07-07  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	* config/rs6000/rs6000.c (rs6000_get_function_versions_dispatcher):

gcc/config/aarch64/aarch64.c

@@ -14324,7 +14324,9 @@ aarch_macro_fusion_pair_p (rtx_insn *prev, rtx_insn *curr)
 	}
     }
 
-  if (aarch64_fusion_enabled_p (AARCH64_FUSE_ALU_BRANCH)
+  if (prev_set
+      && curr_set
+      && aarch64_fusion_enabled_p (AARCH64_FUSE_ALU_BRANCH)
       && any_condjump_p (curr))
     {
       /* We're trying to match: