[committed] Use target-insns.def for clear_cache

[Richard Sandiford]

Bootstrapped & regression-tested on x86_64-linux-gnu and aarch64-linux-gnu.
Also tested via config-list.mk.  Committed as preapproved.

Thanks,
Richard


gcc/
        * target-insns.def (clear_cache): New targetm instruction pattern.
        * builtins.c (expand_builtin___clear_cache): Use it instead of
        HAVE_*/gen_* interface.

Index: gcc/target-insns.def
===================================================================
--- gcc/target-insns.def        2015-07-05 08:58:38.390530076 +0100
+++ gcc/target-insns.def        2015-07-05 08:58:38.386530121 +0100
@@ -37,6 +37,7 @@ DEF_TARGET_INSN (builtin_setjmp_setup, (
 DEF_TARGET_INSN (canonicalize_funcptr_for_compare, (rtx x0, rtx x1))
 DEF_TARGET_INSN (casesi, (rtx x0, rtx x1, rtx x2, rtx x3, rtx x4))
 DEF_TARGET_INSN (check_stack, (rtx x0))
+DEF_TARGET_INSN (clear_cache, (rtx x0, rtx x1))
 DEF_TARGET_INSN (epilogue, (void))
 DEF_TARGET_INSN (exception_receiver, (void))
 DEF_TARGET_INSN (jump, (rtx x0))
Index: gcc/builtins.c
===================================================================
--- gcc/builtins.c      2015-07-05 08:58:38.390530076 +0100
+++ gcc/builtins.c      2015-07-05 08:58:38.382530166 +0100
@@ -4807,20 +4807,22 @@ expand_builtin_copysign (tree exp, rtx t
 /* Expand a call to __builtin___clear_cache.  */
 
 static rtx
-expand_builtin___clear_cache (tree exp ATTRIBUTE_UNUSED)
+expand_builtin___clear_cache (tree exp)
 {
-#ifndef HAVE_clear_cache
+  if (!targetm.code_for_clear_cache)
+    {
 #ifdef CLEAR_INSN_CACHE
-  /* There is no "clear_cache" insn, and __clear_cache() in libgcc
-     does something.  Just do the default expansion to a call to
-     __clear_cache().  */
-  return NULL_RTX;
+      /* There is no "clear_cache" insn, and __clear_cache() in libgcc
+        does something.  Just do the default expansion to a call to
+        __clear_cache().  */
+      return NULL_RTX;
 #else
-  /* There is no "clear_cache" insn, and __clear_cache() in libgcc
-     does nothing.  There is no need to call it.  Do nothing.  */
-  return const0_rtx;
+      /* There is no "clear_cache" insn, and __clear_cache() in libgcc
+        does nothing.  There is no need to call it.  Do nothing.  */
+      return const0_rtx;
 #endif /* CLEAR_INSN_CACHE */
-#else
+    }
+
   /* We have a "clear_cache" insn, and it will handle everything.  */
   tree begin, end;
   rtx begin_rtx, end_rtx;
@@ -4834,7 +4836,7 @@ expand_builtin___clear_cache (tree exp A
       return const0_rtx;
     }
 
-  if (HAVE_clear_cache)
+  if (targetm.have_clear_cache ())
     {
       struct expand_operand ops[2];
 
@@ -4846,11 +4848,10 @@ expand_builtin___clear_cache (tree exp A
 
       create_address_operand (&ops[0], begin_rtx);
       create_address_operand (&ops[1], end_rtx);
-      if (maybe_expand_insn (CODE_FOR_clear_cache, 2, ops))
+      if (maybe_expand_insn (targetm.code_for_clear_cache, 2, ops))
        return const0_rtx;
     }
   return const0_rtx;
-#endif /* HAVE_clear_cache */
 }
 
 /* Given a trampoline address, make sure it satisfies TRAMPOLINE_ALIGNMENT.  */