micromips.md (jraddiusp): New pattern.

2013-04-02  Catherine Moore  <clm@codesourcery.com>
	    Chao-ying Fu <fu@mips.com>

        * config/mips/micromips.md (jraddiusp): New pattern.
        * config/mips/mips.c (mips_expand_epilogue): Use the JRADDIUSP
        instruction if possible.


Co-Authored-By: Chao-ying Fu <fu@mips.com>

From-SVN: r198228

gcc/ChangeLog

+2013-04-02  Catherine Moore  <clm@codesourcery.com>
+	    Chao-ying Fu <fu@mips.com>
+
+        * config/mips/micromips.md (jraddiusp): New pattern.
+        * config/mips/mips.c (mips_expand_epilogue): Use the JRADDIUSP
+        instruction if possible.
+
 2013-04-24  Alan Modra  <amodra@gmail.com>
 
 	* config/rs6000/driver-rs6000.c (elf_dcachebsize): Fix comment pasto.

gcc/config/mips/micromips.md

@@ -95,6 +95,19 @@
    (set_attr "mode" "SI")
    (set_attr "can_delay" "no")])
 
+;; For JRADDIUSP.
+(define_insn "jraddiusp"
+  [(parallel [(return)
+	      (use (reg:SI 31))
+	      (set (reg:SI 29)
+		   (plus:SI (reg:SI 29)
+			    (match_operand 0 "uw5_operand")))])]
+  "TARGET_MICROMIPS"
+  "jraddiusp\t%0"
+  [(set_attr "type"	"trap")
+   (set_attr "can_delay" "no")
+   (set_attr "mode"	"SI")])
+
 ;; For MOVEP.
 (define_peephole2
   [(set (match_operand:MOVEP1 0 "register_operand" "")

gcc/config/mips/mips.c

@@ -11414,6 +11414,7 @@ mips_expand_epilogue (bool sibcall_p)
   const struct mips_frame_info *frame;
   HOST_WIDE_INT step1, step2;
   rtx base, adjust, insn;
+  bool use_jraddiusp_p = false;
 
   if (!sibcall_p && mips_can_use_return_insn ())
     {
@@ -11541,11 +11542,18 @@ mips_expand_epilogue (bool sibcall_p)
 	  emit_insn (gen_cop0_move (gen_rtx_REG (SImode, COP0_STATUS_REG_NUM),
 				    gen_rtx_REG (SImode, K0_REG_NUM)));
 	}
+      else if (TARGET_MICROMIPS
+	       && !crtl->calls_eh_return
+	       && !sibcall_p
+	       && step2 > 0
+	       && mips_unsigned_immediate_p (step2, 5, 2))
+	use_jraddiusp_p = true;
       else
 	/* Deallocate the final bit of the frame.  */
 	mips_deallocate_stack (stack_pointer_rtx, GEN_INT (step2), 0);
     }
 
+  if (!use_jraddiusp_p)
     gcc_assert (!mips_epilogue.cfa_restores);
 
   /* Add in the __builtin_eh_return stack adjustment.  We need to
@@ -11596,12 +11604,16 @@ mips_expand_epilogue (bool sibcall_p)
 	      rtx reg = gen_rtx_REG (Pmode, GP_REG_FIRST + 7);
 	      pat = gen_return_internal (reg);
 	    }
+	  else if (use_jraddiusp_p)
+	    pat = gen_jraddiusp (GEN_INT (step2));
 	  else
 	    {
 	      rtx reg = gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM);
 	      pat = gen_simple_return_internal (reg);
 	    }
 	  emit_jump_insn (pat);
+	  if (use_jraddiusp_p)
+	    mips_epilogue_set_cfa (stack_pointer_rtx, step2);
 	}
     }