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author | Robin Dapp <rdapp@ventanamicro.com> | 2023-06-28 15:48:55 +0200 |
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committer | Robin Dapp <rdapp@ventanamicro.com> | 2023-07-05 16:57:05 +0200 |
commit | c30efd8cd634f8a59bc1bf52e71d8866bf52d56c (patch) | |
tree | 626cf8ee88df61e6b4ee4106d725e0e716799ff2 /gcc/doc/md.texi | |
parent | 573bb719bb82d1d61ca54eb4fddf82eccfd56470 (diff) | |
download | gcc-c30efd8cd634f8a59bc1bf52e71d8866bf52d56c.zip gcc-c30efd8cd634f8a59bc1bf52e71d8866bf52d56c.tar.gz gcc-c30efd8cd634f8a59bc1bf52e71d8866bf52d56c.tar.bz2 |
gimple-isel: Recognize vec_extract pattern.
In gimple-isel we already deduce a vec_set pattern from an
ARRAY_REF(VIEW_CONVERT_EXPR). This patch does the same for a
vec_extract.
The code is largely similar to the vec_set one
including the addition of a can_vec_extract_var_idx_p function
in optabs.cc to check if the backend can handle a register
operand as index. We already have can_vec_extract in
optabs-query but that one checks whether we can extract
specific modes.
With the introduction of an internal function for vec_extract
the expander must not FAIL. For vec_set this has already been
the case so adjust the documentation accordingly.
Additionally, clarify the wording of the vector-vector case for
vec_extract.
gcc/ChangeLog:
* doc/md.texi: Document that vec_set and vec_extract must not
fail.
* gimple-isel.cc (gimple_expand_vec_set_expr): Rename this...
(gimple_expand_vec_set_extract_expr): ...to this.
(gimple_expand_vec_exprs): Call renamed function.
* internal-fn.cc (vec_extract_direct): Add.
(expand_vec_extract_optab_fn): New function to expand
vec_extract optab.
(direct_vec_extract_optab_supported_p): Add.
* internal-fn.def (VEC_EXTRACT): Add.
* optabs.cc (can_vec_extract_var_idx_p): New function.
* optabs.h (can_vec_extract_var_idx_p): Declare.
Diffstat (limited to 'gcc/doc/md.texi')
-rw-r--r-- | gcc/doc/md.texi | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi index f14dd32..b30a824 100644 --- a/gcc/doc/md.texi +++ b/gcc/doc/md.texi @@ -5091,6 +5091,8 @@ Mask elements @var{i} with @var{i} > (operand 5 + operand 6) are ignored. Set given field in the vector value. Operand 0 is the vector to modify, operand 1 is new value of field and operand 2 specify the field index. +This pattern is not allowed to @code{FAIL}. + @cindex @code{vec_extract@var{m}@var{n}} instruction pattern @item @samp{vec_extract@var{m}@var{n}} Extract given field from the vector value. Operand 1 is the vector, operand 2 @@ -5098,7 +5100,10 @@ specify field index and operand 0 place to store value into. The @var{n} mode is the mode of the field or vector of fields that should be extracted, should be either element mode of the vector mode @var{m}, or a vector mode with the same element mode and smaller number of elements. -If @var{n} is a vector mode, the index is counted in units of that mode. +If @var{n} is a vector mode the index is counted in multiples of +mode @var{n}. + +This pattern is not allowed to @code{FAIL}. @cindex @code{vec_init@var{m}@var{n}} instruction pattern @item @samp{vec_init@var{m}@var{n}} |