[PATCH 3/4] Support movbe as a i386 target optimization node

[marxin]

gcc/testsuite/ChangeLog:

2016-07-18  Martin Liska  <mli...@suse.cz>

        * gcc.target/i386/movbe-4.c: New test.

gcc/ChangeLog:

2016-07-18  Martin Liska  <mli...@suse.cz>

        * config/i386/i386.c (ix86_valid_target_attribute_inner_p):
        Handle movbe.
---
 gcc/config/i386/i386.c                  |  1 +
 gcc/testsuite/gcc.target/i386/movbe-4.c | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/i386/movbe-4.c

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 493b7e6..8a30cf2 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -6437,6 +6437,7 @@ ix86_valid_target_attribute_inner_p (tree args, char 
*p_strings[],
     IX86_ATTR_ISA ("mmx",      OPT_mmmx),
     IX86_ATTR_ISA ("pclmul",   OPT_mpclmul),
     IX86_ATTR_ISA ("popcnt",   OPT_mpopcnt),
+    IX86_ATTR_ISA ("movbe",    OPT_mmovbe),
     IX86_ATTR_ISA ("crc32",    OPT_mcrc32),
     IX86_ATTR_ISA ("sse",      OPT_msse),
     IX86_ATTR_ISA ("sse2",     OPT_msse2),
diff --git a/gcc/testsuite/gcc.target/i386/movbe-4.c 
b/gcc/testsuite/gcc.target/i386/movbe-4.c
new file mode 100644
index 0000000..9067091
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/movbe-4.c
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+#pragma GCC target ("movbe")
+
+extern int x;
+
+void
+foo (int i)
+{
+  x = __builtin_bswap32 (i);
+}
+
+int
+bar ()
+{
+  return __builtin_bswap32 (x);
+}
+
+/* { dg-final { scan-assembler-times "movbe\[ \t\]" 2 } } */
-- 
2.8.4