From ca786352c5961c44a5aac91a47cb5a5d154c7be2 Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Thu, 16 Feb 2012 23:20:27 +0100
Subject: [PATCH] re PR middle-end/52285 (libgcrypt _gcry_burn_stack slowdown)
PR tree-optimization/52285
* tree-tailcall.c (find_tail_calls): Ignore gimple_clobber_p stmts
when deciding if a call is a tail call or tail recursion.
From-SVN: r184317
---
gcc/ChangeLog | 6 ++++++
gcc/tree-tailcall.c | 8 ++++++--
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a75204cd69a1..c4790d281864 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2012-02-16 Jakub Jelinek <jakub@redhat.com>
+
+ PR tree-optimization/52285
+ * tree-tailcall.c (find_tail_calls): Ignore gimple_clobber_p stmts
+ when deciding if a call is a tail call or tail recursion.
+
2012-02-16 Kai Tietz <ktietz@redhat.com>
* config/i386/i386.c (legitimate_pic_address_disp_p): Allow
diff --git a/gcc/tree-tailcall.c b/gcc/tree-tailcall.c
index 87fc566ddee2..02e1113f4832 100644
--- a/gcc/tree-tailcall.c
+++ b/gcc/tree-tailcall.c
@@ -1,5 +1,5 @@
/* Tail call optimization on trees.
- Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
+ Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
Free Software Foundation, Inc.
This file is part of GCC.
@@ -400,9 +400,10 @@ find_tail_calls (basic_block bb, struct tailcall **ret)
{
stmt = gsi_stmt (gsi);
- /* Ignore labels, returns and debug stmts. */
+ /* Ignore labels, returns, clobbers and debug stmts. */
if (gimple_code (stmt) == GIMPLE_LABEL
|| gimple_code (stmt) == GIMPLE_RETURN
+ || gimple_clobber_p (stmt)
|| is_gimple_debug (stmt))
continue;
@@ -523,6 +524,9 @@ find_tail_calls (basic_block bb, struct tailcall **ret)
if (gimple_code (stmt) == GIMPLE_RETURN)
break;
+ if (gimple_clobber_p (stmt))
+ continue;
+
if (is_gimple_debug (stmt))
continue;
--
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