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[PATCH] Make multiple_target.c aware of LTO (PR lto/66295)


Hello.

Not being expert in multi_target area, however it consists of 2 passes. The first
one (ipa_target_clone) is responsible for creation of multiple targets for functions
decorated with __attribute__((target_clones("xxx"))). I guess the pass should be
called just in LGEN phase and consecutive clone materialization takes care of these
clones. I'm also adding lto test-case.

Patch can bootstrap on ppc64le-redhat-linux and survives regression tests.
mvc test-cases work find on x86_64-linux-gnu.

Ready to be installed?
Martin
>From 7ec7045680e10838c43b2713a4fa34b205ba5004 Mon Sep 17 00:00:00 2001
From: marxin <mliska@suse.cz>
Date: Fri, 13 Jan 2017 15:26:45 +0100
Subject: [PATCH] Make multiple_target.c aware of LTO (PR lto/66295)

gcc/ChangeLog:

2017-01-13  Martin Liska  <mliska@suse.cz>

	PR lto/66295
	* multiple_target.c (pass_target_clone::gate): Run the pass
	just in LGEN (in LTO mode).

gcc/testsuite/ChangeLog:

2017-01-13  Martin Liska  <mliska@suse.cz>

	PR lto/66295
	* gcc.target/i386/mvc9.c: New test.
---
 gcc/multiple_target.c                |  2 +-
 gcc/testsuite/gcc.target/i386/mvc9.c | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.target/i386/mvc9.c

diff --git a/gcc/multiple_target.c b/gcc/multiple_target.c
index 5be3980db20..3df1e297122 100644
--- a/gcc/multiple_target.c
+++ b/gcc/multiple_target.c
@@ -378,7 +378,7 @@ public:
 bool
 pass_target_clone::gate (function *)
 {
-  return true;
+  return !flag_wpa && !flag_ltrans;
 }
 
 } // anon namespace
diff --git a/gcc/testsuite/gcc.target/i386/mvc9.c b/gcc/testsuite/gcc.target/i386/mvc9.c
new file mode 100644
index 00000000000..d510b6c18b4
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/mvc9.c
@@ -0,0 +1,29 @@
+/* { dg-do run } */
+/* { dg-require-ifunc "" } */
+/* { dg-require-effective-target lto } */
+/* { dg-options "-flto" } */
+
+__attribute__((target_clones("avx","arch=slm","arch=core-avx2","default")))
+int
+foo ()
+{
+  return -2;
+}
+
+int
+bar ()
+{
+  return 2;
+}
+
+int
+main ()
+{
+  int r = 0;
+  r += bar ();
+  r += foo ();
+  r += bar ();
+  r += foo ();
+  r += bar ();
+  return r - 2;
+}
-- 
2.11.0


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