re PR rtl-optimization/70478 ([LRA] S/390: Performance regression - superfluous stack frame)

2017-04-08  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/70478
	* lra-constraints.c: Reverse the last patch.

From-SVN: r246789

gcc/ChangeLog

+2017-04-08  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR rtl-optimization/70478
+	* lra-constraints.c: Reverse the last patch.
+
 2017-04-08  Andreas Tobler  <andreast@gcc.gnu.org>
 
 	* config/aarch64/aarch64-freebsd.h: Define MCOUNT_NAME.

gcc/lra-constraints.c

@@ -2685,21 +2685,6 @@ process_alt_operands (int only_alternative)
 		    }
 		}
 
-	      /* When we use memory operand, the insn should read the
-		 value from memory and even if we just wrote a value
-		 into the memory it is costly in comparison with an
-		 insn alternative which does not use memory
-		 (e.g. register or immediate operand).  */
-	      if (no_regs_p && offmemok)
-		{
-		  if (lra_dump_file != NULL)
-		    fprintf
-		      (lra_dump_file,
-		       "            Using memory insn operand %d: reject+=3\n",
-		       nop);
-		  reject += 3;
-		}
-	      
 #ifdef SECONDARY_MEMORY_NEEDED
 	      /* If reload requires moving value through secondary
 		 memory, it will need one more insn at least.  */