[PATCH v3] gcc/config/tilegx/tilegx.c (tilegx_function_profiler): Save r10 to stack before call mcount

[chengang]

From: Chen Gang <gang.chen.5...@gmail.com>

r10 may also be as parameter stack pointer for the nested function, so
need save it before call mcount.

Also clean up code: use '!' instead of "== 0" for checking
static_chain_decl and compute_total_frame_size.

2016-06-04  Chen Gang  <gang.chen.5...@gmail.com>

        gcc/
        PR target/71331
        * config/tilegx/tilegx.c (tilegx_function_profiler): Save r10
        to stack before call mcount.
        (tilegx_can_use_return_insn_p): Clean up code.
---
 gcc/config/tilegx/tilegx.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/gcc/config/tilegx/tilegx.c b/gcc/config/tilegx/tilegx.c
index 06c832c..55161bb 100644
--- a/gcc/config/tilegx/tilegx.c
+++ b/gcc/config/tilegx/tilegx.c
@@ -3880,8 +3880,8 @@ bool
 tilegx_can_use_return_insn_p (void)
 {
   return (reload_completed
-         && cfun->static_chain_decl == 0
-         && compute_total_frame_size () == 0
+         && !cfun->static_chain_decl
+         && !compute_total_frame_size ()
          && tilegx_current_function_is_leaf ()
          && !crtl->profile && !df_regs_ever_live_p (TILEGX_LINK_REGNUM));
 }
@@ -5507,6 +5507,15 @@ tilegx_function_profiler (FILE *file, int labelno 
ATTRIBUTE_UNUSED)
       fprintf (file, "\t}\n");
     }
 
+  if (cfun->static_chain_decl)
+    {
+      fprintf (file,
+              "\t{\n"
+              "\taddi\tsp, sp, -8\n"
+              "\tst\tsp, r10\n"
+              "\t}\n");
+    }
+
   if (flag_pic)
     {
       fprintf (file,
@@ -5524,6 +5533,13 @@ tilegx_function_profiler (FILE *file, int labelno 
ATTRIBUTE_UNUSED)
               "\t}\n", MCOUNT_NAME);
     }
 
+  if (cfun->static_chain_decl)
+    {
+      fprintf (file,
+              "\taddi\tsp, sp, 8\n"
+              "\tld\tr10, sp\n");
+    }
+
   tilegx_in_bundle = false;
 }
 
-- 
1.9.3