[committed] TILE-Gx/TILEPro: prefetch scheduling fix.

[Walter Lee]

This patch marks the prefetch intrinsics as scheduling barriers.

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b5487ae..39543a1 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,11 @@
 2014-01-25  Walter Lee  <w...@tilera.com>
 
+       * config/tilegx/tilegx.c (tilegx_expand_builtin): Set
+       PREFETCH_SCHEDULE_BARRIER_P to true for prefetches.
+       * config/tilepro/tilepro.c (tilepro_expand_builtin): Ditto.
+
+2014-01-25  Walter Lee  <w...@tilera.com>
+
        * config/tilepro/tilepro.md (ctzdi2): Use register_operand
        predicate.
        (clzdi2): Ditto.
diff --git a/gcc/config/tilegx/tilegx.c b/gcc/config/tilegx/tilegx.c
index 85a46f7..c168621 100644
--- a/gcc/config/tilegx/tilegx.c
+++ b/gcc/config/tilegx/tilegx.c
@@ -3570,6 +3570,12 @@ tilegx_expand_builtin (tree exp,
     }
   if (!pat)
     return NULL_RTX;
+
+  /* If we are generating a prefetch, tell the scheduler not to move
+     it around.  */
+  if (GET_CODE (pat) == PREFETCH)
+    PREFETCH_SCHEDULE_BARRIER_P (pat) = true;
+
   emit_insn (pat);
 
   if (nonvoid)
diff --git a/gcc/config/tilepro/tilepro.c b/gcc/config/tilepro/tilepro.c
index 615d490..74f8800 100644
--- a/gcc/config/tilepro/tilepro.c
+++ b/gcc/config/tilepro/tilepro.c
@@ -3184,6 +3184,12 @@ tilepro_expand_builtin (tree exp,
     }
   if (!pat)
     return NULL_RTX;
+
+  /* If we are generating a prefetch, tell the scheduler not to move
+     it around.  */
+  if (GET_CODE (pat) == PREFETCH)
+    PREFETCH_SCHEDULE_BARRIER_P (pat) = true;
+
   emit_insn (pat);
 
   if (nonvoid)