[PATCH] Make inlining consistent in LTO and non-LTO mode (PR target/71991).

[Martin Liška]

Hi.

Following patch makes non-LTO and LTO mode to behave same.
Patch can bootstrap on ppc64le-redhat-linux and survives regression tests.
The test-case works on x86_64-linux-gnu.

Ready to be installed?
Martin

gcc/testsuite/ChangeLog:

2017-06-28  Martin Liska  <mli...@suse.cz>

        PR target/71991
        * gcc.dg/torture/pr71991.c: New test.

gcc/ChangeLog:

2017-06-28  Martin Liska  <mli...@suse.cz>

        PR target/71991
        * config/i386/i386.c (ix86_can_inline_p): Make inlining consistent
        in LTO and non-LTO mode.
---
 gcc/config/i386/i386.c                 |  5 +++--
 gcc/testsuite/gcc.dg/torture/pr71991.c | 12 ++++++++++++
 2 files changed, 15 insertions(+), 2 deletions(-)
 create mode 100644 gcc/testsuite/gcc.dg/torture/pr71991.c



diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 5e8d0ff0e3d..090b93aecfe 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -7438,8 +7438,9 @@ ix86_can_inline_p (tree caller, tree callee)
   tree caller_tree = DECL_FUNCTION_SPECIFIC_TARGET (caller);
   tree callee_tree = DECL_FUNCTION_SPECIFIC_TARGET (callee);
 
-  /* If callee has no option attributes, then it is ok to inline.  */
-  if (!callee_tree)
+  /* If callee has no option attributes (or default),
+     then it is ok to inline.  */
+  if (!callee_tree || callee_tree == target_option_default_node)
     ret = true;
 
   /* If caller has no option attributes, but callee does then it is not ok to
diff --git a/gcc/testsuite/gcc.dg/torture/pr71991.c b/gcc/testsuite/gcc.dg/torture/pr71991.c
new file mode 100644
index 00000000000..79c927f6844
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr71991.c
@@ -0,0 +1,12 @@
+/* PR target/71991 */
+
+/* { dg-do compile { target i?86-*-* x86_64-*-* } } */
+/* { dg-options "-std=c99" } */
+
+static inline int __attribute__ ((__always_inline__)) fn1 () { return 0; }
+static inline int __attribute__ ((target("inline-all-stringops"))) fn2 () { return fn1 (); }
+
+int main()
+{
+  return fn2();
+}