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| author | Richard Sandiford <richard.sandiford@arm.com> | 2019-11-14 14:36:26 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2019-11-14 14:36:26 +0000 |
| commit | f09552335030433018fd5f7f6b9848339b5ca2da (patch) | |
| tree | 78e267da95a352d5303bc66b513ab10e2f5979a9 /gcc/machmode.h | |
| parent | 89cd5050928afa2d2e9cf836ae39f6cb947f5602 (diff) | |
| download | gcc-f09552335030433018fd5f7f6b9848339b5ca2da.zip gcc-f09552335030433018fd5f7f6b9848339b5ca2da.tar.gz gcc-f09552335030433018fd5f7f6b9848339b5ca2da.tar.bz2 | |
Add a targetm.vectorize.related_mode hook
This patch is the first of a series that tries to remove two
assumptions:
(1) that all vectors involved in vectorisation must be the same size
(2) that there is only one vector mode for a given element mode and
number of elements
Relaxing (1) helps with targets that support multiple vector sizes or
that require the number of elements to stay the same. E.g. if we're
vectorising code that operates on narrow and wide elements, and the
narrow elements use 64-bit vectors, then on AArch64 it would normally
be better to use 128-bit vectors rather than pairs of 64-bit vectors
for the wide elements.
Relaxing (2) makes it possible for -msve-vector-bits=128 to produce
fixed-length code for SVE. It also allows unpacked/half-size SVE
vectors to work with -msve-vector-bits=256.
The patch adds a new hook that targets can use to control how we
move from one vector mode to another. The hook takes a starting vector
mode, a new element mode, and (optionally) a new number of elements.
The flexibility needed for (1) comes in when the number of elements
isn't specified.
All callers in this patch specify the number of elements, but a later
vectoriser patch doesn't.
2019-11-14 Richard Sandiford <richard.sandiford@arm.com>
gcc/
* target.def (related_mode): New hook.
* doc/tm.texi.in (TARGET_VECTORIZE_RELATED_MODE): New hook.
* doc/tm.texi: Regenerate.
* targhooks.h (default_vectorize_related_mode): Declare.
* targhooks.c (default_vectorize_related_mode): New function.
* machmode.h (related_vector_mode): Declare.
* stor-layout.c (related_vector_mode): New function.
* expmed.c (extract_bit_field_1): Use it instead of mode_for_vector.
* optabs-query.c (qimode_for_vec_perm): Likewise.
* tree-vect-stmts.c (get_group_load_store_type): Likewise.
(vectorizable_store, vectorizable_load): Likewise
From-SVN: r278229
Diffstat (limited to 'gcc/machmode.h')
| -rw-r--r-- | gcc/machmode.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/gcc/machmode.h b/gcc/machmode.h index 64ac213..906b216 100644 --- a/gcc/machmode.h +++ b/gcc/machmode.h @@ -880,6 +880,8 @@ extern opt_scalar_int_mode int_mode_for_mode (machine_mode); extern opt_machine_mode bitwise_mode_for_mode (machine_mode); extern opt_machine_mode mode_for_vector (scalar_mode, poly_uint64); extern opt_machine_mode mode_for_int_vector (unsigned int, poly_uint64); +extern opt_machine_mode related_vector_mode (machine_mode, scalar_mode, + poly_uint64 = 0); /* Return the integer vector equivalent of MODE, if one exists. In other words, return the mode for an integer vector that has the same number |