target.def (autovectorize_vector_sizes): New target hook.

2010-10-07  Richard Guenther  <rguenther@suse.de>

	* target.def (autovectorize_vector_sizes): New target hook.
	* targhooks.c (default_autovectorize_vector_sizes): New function.
	* targhooks.h (default_autovectorize_vector_sizes): Declare.
	* doc/tm.texi.in (TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_SIZES):
	Document.
	* doc/tm.texi: Update.
	* config/i386/i386.c (ix86_autovectorize_vector_sizes): New function.
	(TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_SIZES): Define.

From-SVN: r165115

7 files changed, 56 insertions, 0 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 20df6bb..94eada1 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,16 @@
 2010-10-07  Richard Guenther  <rguenther@suse.de>
 
+	* target.def (autovectorize_vector_sizes): New target hook.
+	* targhooks.c (default_autovectorize_vector_sizes): New function.
+	* targhooks.h (default_autovectorize_vector_sizes): Declare.
+	* doc/tm.texi.in (TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_SIZES):
+	Document.
+	* doc/tm.texi: Update.
+	* config/i386/i386.c (ix86_autovectorize_vector_sizes): New function.
+	(TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_SIZES): Define.
+
+2010-10-07  Richard Guenther  <rguenther@suse.de>
+
 	* target.def (units_per_simd_word): Rename to ...
 	(preferred_simd_mode): ... this.  Return mode instead of size.
 	* targhooks.c (default_units_per_simd_word): Rename to ...
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 74ded78..39308cf 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -32993,6 +32993,15 @@ ix86_preferred_simd_mode (enum machine_mode mode)
   return word_mode;
 }
 
+/* If AVX is enabled then try vectorizing with both 256bit and 128bit
+   vectors.  */
+
+static unsigned int
+ix86_autovectorize_vector_sizes (void)
+{
+  return TARGET_AVX ? 32 | 16 : 0;
+}
+
 /* Initialize the GCC target structure.  */
 #undef TARGET_RETURN_IN_MEMORY
 #define TARGET_RETURN_IN_MEMORY ix86_return_in_memory
@@ -33253,6 +33262,9 @@ ix86_preferred_simd_mode (enum machine_mode mode)
 #undef TARGET_VECTORIZE_PREFERRED_SIMD_MODE
 #define TARGET_VECTORIZE_PREFERRED_SIMD_MODE \
   ix86_preferred_simd_mode
+#undef TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_SIZES
+#define TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_SIZES \
+  ix86_autovectorize_vector_sizes
 
 #undef TARGET_SET_CURRENT_FUNCTION
 #define TARGET_SET_CURRENT_FUNCTION ix86_set_current_function
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index afa1971..faa7250 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -5750,6 +5750,13 @@ equal to @code{word_mode}, because the vectorizer can do some
 transformations even in absence of specialized @acronym{SIMD} hardware.
 @end deftypefn
 
+@deftypefn {Target Hook} {unsigned int} TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_SIZES (void)
+This hook should return a mask of sizes that should be iterated over
+after trying to autovectorize using the vector size derived from the
+mode returned by @code{TARGET_VECTORIZE_PREFERRED_SIMD_MODE}.
+The default is zero which means to not iterate over other vector sizes.
+@end deftypefn
+
 @node Anchored Addresses
 @section Anchored Addresses
 @cindex anchored addresses
diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in
index 8489027..cdd9a22 100644
--- a/gcc/doc/tm.texi.in
+++ b/gcc/doc/tm.texi.in
@@ -5748,6 +5748,13 @@ equal to @code{word_mode}, because the vectorizer can do some
 transformations even in absence of specialized @acronym{SIMD} hardware.
 @end deftypefn
 
+@hook TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_SIZES
+This hook should return a mask of sizes that should be iterated over
+after trying to autovectorize using the vector size derived from the
+mode returned by @code{TARGET_VECTORIZE_PREFERRED_SIMD_MODE}.
+The default is zero which means to not iterate over other vector sizes.
+@end deftypefn
+
 @node Anchored Addresses
 @section Anchored Addresses
 @cindex anchored addresses
diff --git a/gcc/target.def b/gcc/target.def
index f104ae8..266870a 100644
--- a/gcc/target.def
+++ b/gcc/target.def
@@ -889,6 +889,15 @@ DEFHOOK
  (enum machine_mode mode),
  default_preferred_simd_mode)
 
+/* Returns a mask of vector sizes to iterate over when auto-vectorizing
+   after processing the preferred one derived from preferred_simd_mode.  */
+DEFHOOK
+(autovectorize_vector_sizes,
+ "",
+ unsigned int,
+ (void),
+ default_autovectorize_vector_sizes)
+
 HOOK_VECTOR_END (vectorize)
 
 #undef HOOK_PREFIX
diff --git a/gcc/targhooks.c b/gcc/targhooks.c
index 0a65b2a..9d7ebc0 100644
--- a/gcc/targhooks.c
+++ b/gcc/targhooks.c
@@ -985,6 +985,15 @@ default_preferred_simd_mode (enum machine_mode mode ATTRIBUTE_UNUSED)
   return word_mode;
 }
 
+/* By default only the size derived from the preferred vector mode
+   is tried.  */
+
+unsigned int
+default_autovectorize_vector_sizes (void)
+{
+  return 0;
+}
+
 /* Determine whether or not a pointer mode is valid. Assume defaults
    of ptr_mode or Pmode - can be overridden.  */
 bool
diff --git a/gcc/targhooks.h b/gcc/targhooks.h
index a705d7e..920c9183 100644
--- a/gcc/targhooks.h
+++ b/gcc/targhooks.h
@@ -87,6 +87,7 @@ default_builtin_support_vector_misalignment (enum machine_mode mode,
 					     const_tree,
 					     int, bool);
 extern enum machine_mode default_preferred_simd_mode (enum machine_mode mode);
+extern unsigned int default_autovectorize_vector_sizes (void);
 
 /* These are here, and not in hooks.[ch], because not all users of
    hooks.h include tm.h, and thus we don't have CUMULATIVE_ARGS.  */