re PR target/38056 (Missed tail calls on ia64)

	PR target/38056
	* config/ia64/ia64.c (ia64_function_ok_for_sibcall): Check
	TARGET_CONST_GP.
	* gcc.target/ia64/sibcall-opt-1.c: New test.
	* gcc.target/ia64/sibcall-opt-2.c: New test.

From-SVN: r144168

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5f8aac03cb50c5f6bc1a93ce584eaf0741a12406..f4b29ef60038882fcfb7e888e0da0bcb30d6b0eb 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2009-02-13  Steve Ellcey  <sje@cup.hp.com>
+
+       PR target/38056
+       * config/ia64/ia64.c (ia64_function_ok_for_sibcall): Check
+       TARGET_CONST_GP.
+
 2009-02-13  H.J. Lu  <hongjiu.lu@intel.com>
 
        PR target/39149

diff --git a/gcc/config/ia64/ia64.c b/gcc/config/ia64/ia64.c
index 6c28801500abfc7445412526d366f8d1847a9ab9..495d943d10ccef8adc5f82c8448d4fa9da583311 100644 (file)
--- a/gcc/config/ia64/ia64.c
+++ b/gcc/config/ia64/ia64.c
@@ -4365,8 +4365,9 @@ ia64_function_ok_for_sibcall (tree decl, tree exp ATTRIBUTE_UNUSED)
     return false;
 
   /* We must always return with our current GP.  This means we can
-     only sibcall to functions defined in the current module.  */
-  return decl && (*targetm.binds_local_p) (decl);
+     only sibcall to functions defined in the current module unless
+     TARGET_CONST_GP is set to true.  */
+  return (decl && (*targetm.binds_local_p) (decl)) || TARGET_CONST_GP;
 }
 \f
 

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index a0f16507404fa17f34febd07e55f2be067f42697..ca7aece73b7af734920db107cbe68f883d69a51b 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2009-02-13  Steve Ellcey  <sje@cup.hp.com>
+
+       PR target/38056
+       * gcc.target/ia64/sibcall-opt-1.c: New test.
+       * gcc.target/ia64/sibcall-opt-2.c: New test.
+
 2009-02-13  Paul Thomas  <pault@gcc.gnu.org>
 
        PR fortran/36528

diff --git a/gcc/testsuite/gcc.target/ia64/sibcall-opt-1.c b/gcc/testsuite/gcc.target/ia64/sibcall-opt-1.c
new file mode 100644 (file)
index 0000000..6e8d1a2
--- /dev/null
+++ b/gcc/testsuite/gcc.target/ia64/sibcall-opt-1.c
@@ -0,0 +1,12 @@
+/* PR target/38056.  Do not do sibcall optimization across object file
+   boundery when -mconstant-gp is not used.  */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-final { scan-assembler "br.call.*bar" } } */
+
+int bar(int x);
+
+int foo(int x)
+{
+  return (bar(x + 1));
+}

diff --git a/gcc/testsuite/gcc.target/ia64/sibcall-opt-2.c b/gcc/testsuite/gcc.target/ia64/sibcall-opt-2.c
new file mode 100644 (file)
index 0000000..d802b79
--- /dev/null
+++ b/gcc/testsuite/gcc.target/ia64/sibcall-opt-2.c
@@ -0,0 +1,12 @@
+/* PR target/38056.  Do sibcall optimization across object file
+   boundery when -mconstant-gp is used.  */
+/* { dg-do compile } */
+/* { dg-options "-O2 -mconstant-gp" } */
+/* { dg-final { scan-assembler-not "br.call.*bar" } } */
+
+int bar(int x);
+
+int foo(int x)
+{
+  return (bar(x + 1));
+}