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Diffstat (limited to 'gcc/doc/md.texi')
| -rw-r--r-- | gcc/doc/md.texi | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi index 7e448153eb7..5b700d36c15 100644 --- a/gcc/doc/md.texi +++ b/gcc/doc/md.texi @@ -5050,6 +5050,46 @@ There is no need for a target to supply both @samp{vec_perm@var{m}} and @samp{vec_perm_const@var{m}} if the former can trivially implement the operation with, say, the vector constant loaded into a register. +@cindex @code{vec_reverse_@var{m}} instruction pattern +@item @samp{vec_reverse_@var{m}} +Reverse the order of the elements in vector input operand 1 and store +the result in vector output operand 0. Both operands have mode @var{m}. + +This pattern is provided mainly for targets with variable-length vectors. +Targets with fixed-length vectors can instead handle any reverse-specific +optimizations in @samp{vec_perm_const@var{m}}. + +@cindex @code{vec_interleave_lo_@var{m}} instruction pattern +@item @samp{vec_interleave_lo_@var{m}} +Take the lowest-indexed halves of vector input operands 1 and 2 and +interleave the elements, so that element @var{x} of operand 1 is followed by +element @var{x} of operand 2. Store the result in vector output operand 0. +All three operands have mode @var{m}. + +This pattern is provided mainly for targets with variable-length +vectors. Targets with fixed-length vectors can instead handle any +interleave-specific optimizations in @samp{vec_perm_const@var{m}}. + +@cindex @code{vec_interleave_hi_@var{m}} instruction pattern +@item @samp{vec_interleave_hi_@var{m}} +Like @samp{vec_interleave_lo_@var{m}}, but operate on the highest-indexed +halves instead of the lowest-indexed halves. + +@cindex @code{vec_extract_even_@var{m}} instruction pattern +@item @samp{vec_extract_even_@var{m}} +Concatenate vector input operands 1 and 2, extract the elements with +even-numbered indices, and store the result in vector output operand 0. +All three operands have mode @var{m}. + +This pattern is provided mainly for targets with variable-length vectors. +Targets with fixed-length vectors can instead handle any +extract-specific optimizations in @samp{vec_perm_const@var{m}}. + +@cindex @code{vec_extract_odd_@var{m}} instruction pattern +@item @samp{vec_extract_odd_@var{m}} +Like @samp{vec_extract_even_@var{m}}, but extract the elements with +odd-numbered indices. + @cindex @code{push@var{m}1} instruction pattern @item @samp{push@var{m}1} Output a push instruction. Operand 0 is value to push. Used only when |