aarch64.c (aarch_macro_fusion_pair_p): Don't access prev before checking it for NULLness in the...

2018-09-24  Andrew Pinski  <apinski@marvell.com>

        *  config/aarch64/aarch64.c (aarch_macro_fusion_pair_p): Don't
        access prev before checking it for NULLness in the
        AARCH64_FUSE_CMP_BRANCH case.

From-SVN: r264548

gcc/ChangeLog

+2018-09-24  Andrew Pinski  <apinski@marvell.com>
+
+	*  config/aarch64/aarch64.c (aarch_macro_fusion_pair_p): Don't
+	access prev before checking it for NULLness in the
+	AARCH64_FUSE_CMP_BRANCH case.
+
 2018-09-24  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR target/82699

gcc/config/aarch64/aarch64.c

@@ -16510,8 +16510,6 @@ aarch_macro_fusion_pair_p (rtx_insn *prev, rtx_insn *curr)
   if (aarch64_fusion_enabled_p (AARCH64_FUSE_CMP_BRANCH)
       && any_condjump_p (curr))
     {
-      enum attr_type prev_type = get_attr_type (prev);
-
       unsigned int condreg1, condreg2;
       rtx cc_reg_1;
       aarch64_fixed_condition_code_regs (&condreg1, &condreg2);
@@ -16521,6 +16519,8 @@ aarch_macro_fusion_pair_p (rtx_insn *prev, rtx_insn *curr)
 	  && prev
 	  && modified_in_p (cc_reg_1, prev))
 	{
+	  enum attr_type prev_type = get_attr_type (prev);
+
 	  /* FIXME: this misses some which is considered simple arthematic
 	     instructions for ThunderX.  Simple shifts are missed here.  */
 	  if (prev_type == TYPE_ALUS_SREG