v2: Update rs6000 length_mode hook to QImode, also update description of the
hook.
gcc/ChangeLog:
2020-MM-DD Kewen Lin <li...@gcc.gnu.org>
* config/rs6000/rs6000.c (TARGET_VECTORIZE_LENGTH_MODE): New macro.
* doc/tm.texi: Regenerate.
* doc/tm.texi.in: New hook.
* target.def: Likewise.
---
gcc/config/rs6000/rs6000.c | 3 +++
gcc/doc/tm.texi | 8 ++++++++
gcc/doc/tm.texi.in | 2 ++
gcc/target.def | 9 +++++++++
4 files changed, 22 insertions(+)
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 8435bc15d72..89881a352f0 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -1659,6 +1659,9 @@ static const struct attribute_spec
rs6000_attribute_table[] =
#undef TARGET_HAVE_COUNT_REG_DECR_P
#define TARGET_HAVE_COUNT_REG_DECR_P true
+#undef TARGET_VECTORIZE_LENGTH_MODE
+#define TARGET_VECTORIZE_LENGTH_MODE QImode
+
/* 1000000000 is infinite cost in IVOPTs. */
#undef TARGET_DOLOOP_COST_FOR_GENERIC
#define TARGET_DOLOOP_COST_FOR_GENERIC 1000000000
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 6e7d9dc54a9..087a39b840d 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -6084,6 +6084,14 @@ The default implementation returns a
@code{MODE_VECTOR_INT} with the
same size and number of elements as @var{mode}, if such a mode exists.
@end deftypefn
+@deftypevr {Target Hook} scalar_int_mode TARGET_VECTORIZE_LENGTH_MODE
+For the targets which support length-based partial vectorization, also
+known as vector memory access with length, return the scalar int mode to
+be used for the length. Normally it should be set according to the
+required minimum precision of supported length.
+The default is to use @code{word_mode}.
+@end deftypevr
+
@deftypefn {Target Hook} bool TARGET_VECTORIZE_EMPTY_MASK_IS_EXPENSIVE
(unsigned @var{ifn})
This hook returns true if masked internal function @var{ifn} (really of
type @code{internal_fn}) should be considered expensive when the mask is
diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in
index 3be984bbd5c..83034176b56 100644
--- a/gcc/doc/tm.texi.in
+++ b/gcc/doc/tm.texi.in
@@ -4181,6 +4181,8 @@ address; but often a machine-dependent strategy can
generate better code.
@hook TARGET_VECTORIZE_GET_MASK_MODE
+@hook TARGET_VECTORIZE_LENGTH_MODE
+
@hook TARGET_VECTORIZE_EMPTY_MASK_IS_EXPENSIVE
@hook TARGET_VECTORIZE_INIT_COST
diff --git a/gcc/target.def b/gcc/target.def
index 07059a87caf..f64861189cb 100644
--- a/gcc/target.def
+++ b/gcc/target.def
@@ -1969,6 +1969,15 @@ same size and number of elements as @var{mode}, if such
a mode exists.",
(machine_mode mode),
default_get_mask_mode)
+DEFHOOKPOD
+(length_mode,
+ "For the targets which support length-based partial vectorization, also\n\
+known as vector memory access with length, return the scalar int mode to\n\
+be used for the length. Normally it should be set according to the\n\
+required minimum precision of supported length.\n\
+The default is to use @code{word_mode}.",
+ scalar_int_mode, word_mode)
+
/* Function to say whether a masked operation is expensive when the
mask is all zeros. */
DEFHOOK
--
