(gen_input_reload): If reg-reg add is not valid, try copying reg-reg

and adding reg-int.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@6530 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/reload1.c b/gcc/reload1.c
index 3c15a7f..503ebe3 100644 (file)
--- a/gcc/reload1.c
+++ b/gcc/reload1.c
@@ -6544,7 +6544,27 @@ gen_input_reload (reloadreg, in, opnum, type)
       if (rtx_equal_p (op0, op1))
        op1 = reloadreg;
 
-      emit_insn (gen_add2_insn (reloadreg, op1));
+      insn = emit_insn (gen_add2_insn (reloadreg, op1));
+
+      /* If that failed, copy the address register to the reload register.
+        Then add the constant to the reload register. */
+
+      code = recog_memoized (insn);
+
+      if (code >= 0)
+       {
+         insn_extract (insn);
+         /* We want constrain operands to treat this insn strictly in
+            its validity determination, i.e., the way it would after reload
+            has completed.  */
+         if (constrain_operands (code, 1))
+           return insn;
+       }
+
+      delete_insns_since (last);
+
+      emit_insn (gen_move_insn (reloadreg, op1));
+      emit_insn (gen_add2_insn (reloadreg, op0));
     }
 
 #ifdef SECONDARY_MEMORY_NEEDED