From: Ian Lance Taylor <iant@google.com>
Date: Mon, 20 Mar 2017 17:43:08 +0000 (+0000)
Subject: i386.c (ix86_function_regparm): Save an extra register for -fsplit-stack with DECL_ST... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=dd629845b0931912853a26bf8f8e05adf9f048a2;p=gcc.git

i386.c (ix86_function_regparm): Save an extra register for -fsplit-stack with DECL_STATIC_CHAIN.

	* config/i386/i386.c (ix86_function_regparm): Save an extra
	register for -fsplit-stack with DECL_STATIC_CHAIN.

From-SVN: r246286
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 7164d10df6b..1385d92bcdf 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2017-03-20  Ian Lance Taylor  <iant@google.com>
+
+	* config/i386/i386.c (ix86_function_regparm): Save an extra
+	register for -fsplit-stack with DECL_STATIC_CHAIN.
+
 2017-03-17  Palmer Dabbelt  <palmer@dabbelt.com>
 
 	PR target/79912
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index f58d529604c..259f97b5a10 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -7975,8 +7975,14 @@ ix86_function_regparm (const_tree type, const_tree decl)
 		local_regparm = 2;
 
 	      /* Save a register for the split stack.  */
-	      if (local_regparm == 3 && flag_split_stack)
-		local_regparm = 2;
+	      if (flag_split_stack)
+		{
+		  if (local_regparm == 3)
+		    local_regparm = 2;
+		  else if (local_regparm == 2
+			   && DECL_STATIC_CHAIN (target->decl))
+		    local_regparm = 1;
+		}
 
 	      /* Each fixed register usage increases register pressure,
 		 so less registers should be used for argument passing.