diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c6a97e1b4c0..b0cfc0f1ed5 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2019-02-09  Aaron Sawdey  <acsawdey@linux.ibm.com>
+
+	* config/rs6000/rs6000-string.c (expand_compare_loop,
+	expand_block_compare): Insert REG_BR_PROB notes in inline expansion of
+	memcmp/strncmp.
+
 2019-02-09  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/89246
diff --git a/gcc/config/rs6000/rs6000-string.c b/gcc/config/rs6000/rs6000-string.c
index 7101dc77e08..560ecbaccc7 100644
--- a/gcc/config/rs6000/rs6000-string.c
+++ b/gcc/config/rs6000/rs6000-string.c
@@ -1525,6 +1525,7 @@ expand_compare_loop (rtx operands[])
 	  else
 	    j = emit_jump_insn (gen_bdnztf_si (fc_loop, ctr, ctr,
 					       eqrtx, cond));
+	  add_reg_br_prob_note (j, profile_probability::likely ());
 	  JUMP_LABEL (j) = fc_loop;
 	  LABEL_NUSES (fc_loop) += 1;
 
@@ -1896,7 +1897,8 @@ expand_block_compare_gpr(unsigned HOST_WIDE_INT bytes, unsigned int base_align,
 	      rtx ne_rtx = gen_rtx_NE (VOIDmode, cond, const0_rtx);
 	      rtx ifelse = gen_rtx_IF_THEN_ELSE (VOIDmode, ne_rtx,
 						 cvt_ref, pc_rtx);
-	      rtx j = emit_jump_insn (gen_rtx_SET (pc_rtx, ifelse));
+	      rtx_insn *j = emit_jump_insn (gen_rtx_SET (pc_rtx, ifelse));
+	      add_reg_br_prob_note (j, profile_probability::likely ());
 	      JUMP_LABEL (j) = convert_label;
 	      LABEL_NUSES (convert_label) += 1;
 	    }