[PATCH] i386: Don't generate ENDBR if function is only called directly

["H.J. Lu" <hjl dot tools at gmail dot com>]

There is no need to insert ENDBR instruction if function is only called
directly.

OK for trunk if there is no regressions?

H.J.
----
gcc/

	PR target/82659
	* config/i386/i386.c (pass_insert_endbranch::gate): Return
	false if function is only called directly.

gcc/testsuite/

	PR target/82659
	* gcc.target/i386/pr82659-1.c: New test.
	* gcc.target/i386/pr82659-2.c: Likewise.
	* gcc.target/i386/pr82659-3.c: Likewise.
	* gcc.target/i386/pr82659-4.c: Likewise.
	* gcc.target/i386/pr82659-5.c: Likewise.
	* gcc.target/i386/pr82659-6.c: Likewise.
---
 gcc/config/i386/i386.c                    |  6 ++++--
 gcc/testsuite/gcc.target/i386/pr82659-1.c | 19 +++++++++++++++++++
 gcc/testsuite/gcc.target/i386/pr82659-2.c | 18 ++++++++++++++++++
 gcc/testsuite/gcc.target/i386/pr82659-3.c | 21 +++++++++++++++++++++
 gcc/testsuite/gcc.target/i386/pr82659-4.c | 15 +++++++++++++++
 gcc/testsuite/gcc.target/i386/pr82659-5.c | 10 ++++++++++
 gcc/testsuite/gcc.target/i386/pr82659-6.c | 19 +++++++++++++++++++
 7 files changed, 106 insertions(+), 2 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/i386/pr82659-1.c
 create mode 100644 gcc/testsuite/gcc.target/i386/pr82659-2.c
 create mode 100644 gcc/testsuite/gcc.target/i386/pr82659-3.c
 create mode 100644 gcc/testsuite/gcc.target/i386/pr82659-4.c
 create mode 100644 gcc/testsuite/gcc.target/i386/pr82659-5.c
 create mode 100644 gcc/testsuite/gcc.target/i386/pr82659-6.c

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index fb0b7e71469..b86504378ae 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -2693,9 +2693,11 @@ public:
   {}
 
   /* opt_pass methods: */
-  virtual bool gate (function *)
+  virtual bool gate (function *fun)
     {
-      return ((flag_cf_protection & CF_BRANCH) && TARGET_IBT);
+      return ((flag_cf_protection & CF_BRANCH)
+	      && TARGET_IBT
+	      && !cgraph_node::get (fun->decl)->only_called_directly_p ());
     }
 
   virtual unsigned int execute (function *)
diff --git a/gcc/testsuite/gcc.target/i386/pr82659-1.c b/gcc/testsuite/gcc.target/i386/pr82659-1.c
new file mode 100644
index 00000000000..8f0a6906815
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr82659-1.c
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fcf-protection -mcet" } */
+/* { dg-final { scan-assembler-times "endbr32" 1 { target ia32 } } } */
+/* { dg-final { scan-assembler-times "endbr64" 1 { target { ! ia32 } } } } */
+
+extern int x;
+
+static void
+__attribute__ ((noinline, noclone))
+test (int i)
+{
+  x = i;
+}
+
+void
+bar (int i)
+{
+  test (i);
+}
diff --git a/gcc/testsuite/gcc.target/i386/pr82659-2.c b/gcc/testsuite/gcc.target/i386/pr82659-2.c
new file mode 100644
index 00000000000..228a20006b6
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr82659-2.c
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fcf-protection -mcet" } */
+/* { dg-final { scan-assembler-times "endbr32" 2 { target ia32 } } } */
+/* { dg-final { scan-assembler-times "endbr64" 2 { target { ! ia32 } } } } */
+
+extern int x;
+
+void
+test (int i)
+{
+  x = i;
+}
+
+void
+bar (int i)
+{
+  test (i);
+}
diff --git a/gcc/testsuite/gcc.target/i386/pr82659-3.c b/gcc/testsuite/gcc.target/i386/pr82659-3.c
new file mode 100644
index 00000000000..6ae23e40abc
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr82659-3.c
@@ -0,0 +1,21 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fcf-protection -mcet" } */
+/* { dg-final { scan-assembler-times "endbr32" 2 { target ia32 } } } */
+/* { dg-final { scan-assembler-times "endbr64" 2 { target { ! ia32 } } } } */
+
+extern int x;
+
+static void
+__attribute__ ((noinline, noclone))
+test (int i)
+{
+  x = i;
+}
+
+extern __typeof (test) foo __attribute__ ((alias ("test")));
+
+void
+bar (int i)
+{
+  test (i);
+}
diff --git a/gcc/testsuite/gcc.target/i386/pr82659-4.c b/gcc/testsuite/gcc.target/i386/pr82659-4.c
new file mode 100644
index 00000000000..ca87264e98b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr82659-4.c
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fcf-protection -mcet" } */
+/* { dg-final { scan-assembler-times "endbr32" 2 { target ia32 } } } */
+/* { dg-final { scan-assembler-times "endbr64" 2 { target { ! ia32 } } } } */
+
+static void
+test (void)
+{
+}
+
+void *
+bar (void)
+{
+  return test;
+}
diff --git a/gcc/testsuite/gcc.target/i386/pr82659-5.c b/gcc/testsuite/gcc.target/i386/pr82659-5.c
new file mode 100644
index 00000000000..c34eade0f90
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr82659-5.c
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fcf-protection -mcet" } */
+/* { dg-final { scan-assembler-times "endbr32" 1 { target ia32 } } } */
+/* { dg-final { scan-assembler-times "endbr64" 1 { target { ! ia32 } } } } */
+static void
+test (void)
+{
+}
+
+void (*test_p) (void) = test;
diff --git a/gcc/testsuite/gcc.target/i386/pr82659-6.c b/gcc/testsuite/gcc.target/i386/pr82659-6.c
new file mode 100644
index 00000000000..b4ffd65c74f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr82659-6.c
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fcf-protection -mcet" } */
+/* { dg-final { scan-assembler-times "endbr32" 2 { target ia32 } } } */
+/* { dg-final { scan-assembler-times "endbr64" 2 { target { ! ia32 } } } } */
+
+extern int x;
+
+ __attribute__ ((visibility ("hidden")))
+void
+test (int i)
+{
+  x = i;
+}
+
+void
+bar (int i)
+{
+  test (i);
+}
-- 
2.13.6