From: Jeff Law <law@gcc.gnu.org>
Date: Tue, 21 Oct 1997 19:52:12 +0000 (-0600)
Subject: mn10200.h (GO_IF_LEGITIMATE_ADDRESS): Do not allow indexed addresses.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e92f9bcf4d5c6d54954469b27835924194b02aa7;p=gcc.git

mn10200.h (GO_IF_LEGITIMATE_ADDRESS): Do not allow indexed addresses.

        * mn10200.h (GO_IF_LEGITIMATE_ADDRESS): Do not allow indexed
        addresses.
        * mn10200.md (neghi2): Provide an alternative which works if
        the input and output register are the same.

From-SVN: r16136
---

diff --git a/gcc/config/mn10200/mn10200.h b/gcc/config/mn10200/mn10200.h
index 2364af35866..4ab05e915a1 100644
--- a/gcc/config/mn10200/mn10200.h
+++ b/gcc/config/mn10200/mn10200.h
@@ -566,7 +566,7 @@ extern struct rtx_def *function_arg();
 #define TRAMPOLINE_TEMPLATE(FILE)			\
   do {							\
     fprintf (FILE, "\t.byte 0xfd\n");			\
-    fprintf (FILE, "\t.byte 0x02\n");			\
+    fprintf (FILE, "\t.byte 0x00\n");			\
     fprintf (FILE, "\t.byte 0x00\n");			\
     fprintf (FILE, "\tmov (a3),a0\n");			\
     fprintf (FILE, "\tadd -4,a3\n");			\
@@ -663,6 +663,11 @@ extern struct rtx_def *function_arg();
    The MODE argument is the machine mode for the MEM expression
    that wants to use this address.
 
+   We used to allow reg+reg addresses for QImode and HImode; however,
+   they tended to cause the register allocator to run out of registers.
+   Basically, an indexed load/store always keeps 2 data and one address
+   register live, which is just too many for this machine.  */
+
    The other macros defined here are used only in GO_IF_LEGITIMATE_ADDRESS,
    except for CONSTANT_ADDRESS_P which is actually machine-independent.  */
 
@@ -692,10 +697,6 @@ extern struct rtx_def *function_arg();
 	{						\
 	  if (GET_CODE (index) == CONST_INT)		\
 	    goto ADDR;					\
-	  if (GET_CODE (index) == REG			\
-	      && REG_OK_FOR_INDEX_P (index)		\
-	      && GET_MODE_SIZE (MODE) <= word_mode)	\
-	    goto ADDR;					\
 	}						\
     }							\
 }
diff --git a/gcc/config/mn10200/mn10200.md b/gcc/config/mn10200/mn10200.md
index 90eac0e9e08..2fffb91c496 100644
--- a/gcc/config/mn10200/mn10200.md
+++ b/gcc/config/mn10200/mn10200.md
@@ -497,13 +497,21 @@
 ;; 
 ;; We could do HImode negations with a "not;add" sequence, but
 ;; generally it's generated slightly worse code.
+;;
+;; The second alternative is not strictly necesasry, but helps
+;; when the register allocators start running short of registers.
 (define_insn "neghi2"
-  [(set (match_operand:HI 0 "general_operand" "=&d")
-        (neg:HI (match_operand:HI 1 "general_operand" "d")))]
+  [(set (match_operand:HI 0 "general_operand" "=&d,d")
+        (neg:HI (match_operand:HI 1 "general_operand" "d,0")))]
   ""
-  "sub %0,%0\;sub %1,%0"
+  "@
+  sub %0,%0\;sub %1,%0
+  not %0\;add 1,%0"
   [(set_attr "cc" "set_zn")])
 
+;; The not/and sequence won't work here.  It's not clear if we'll
+;; ever need to provide an alternate sequence since this should
+;; be used much less frequently than neghi2.
 (define_insn "negpsi2"
   [(set (match_operand:PSI 0 "general_operand" "=&d")
         (neg:PSI (match_operand:PSI 1 "general_operand" "d")))]