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Diffstat (limited to 'gcc/doc/md.texi')
| -rw-r--r-- | gcc/doc/md.texi | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi index 7bf2cc0..86ed4ff 100644 --- a/gcc/doc/md.texi +++ b/gcc/doc/md.texi @@ -5408,18 +5408,20 @@ This pattern is not allowed to @code{FAIL}. @cindex @code{len_load_@var{m}} instruction pattern @item @samp{len_load_@var{m}} -Load (operand 2 + operand 3) elements from memory operand 1 -into vector register operand 0, setting the other elements of -operand 0 to undefined values. Operands 0 and 1 have mode @var{m}, -which must be a vector mode. Operand 2 has whichever integer mode the -target prefers. Operand 3 conceptually has mode @code{QI}. - -Operand 2 can be a variable or a constant amount. Operand 3 specifies a +Load (operand 3 + operand 4) elements from memory operand 1 +into vector register operand 0. Operands 0 and 1 have mode @var{m}, +which must be a vector mode. Operand 3 has whichever integer mode the +target prefers. Operand 2 (the “else value”) is of mode @var{m} and +specifies which value is loaded for the remaining elements. The predicate +of operand 2 must only accept the else values that the target actually +supports. Operand 4 conceptually has mode @code{QI}. + +Operand 3 can be a variable or a constant amount. Operand 4 specifies a constant bias: it is either a constant 0 or a constant -1. The predicate on -operand 3 must only accept the bias values that the target actually supports. +operand 4 must only accept the bias values that the target actually supports. GCC handles a bias of 0 more efficiently than a bias of -1. -If (operand 2 + operand 3) exceeds the number of elements in mode +If (operand 3 + operand 4) exceeds the number of elements in mode @var{m}, the behavior is undefined. If the target prefers the length to be measured in bytes rather than |