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Diffstat (limited to 'gcc/doc/md.texi')
| -rw-r--r-- | gcc/doc/md.texi | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi index 5745ec45bb6..54ce9f5e315 100644 --- a/gcc/doc/md.texi +++ b/gcc/doc/md.texi @@ -3971,6 +3971,11 @@ destination, in the form of a @code{const_int} rtx. Thus, if the compiler knows that both source and destination are word-aligned, it may provide the value 4 for this operand. +Optional operands 5 and 6 specify expected alignment and size of block +respectively. The expected alignment differs from alignment in operand 4 +in a way that the blocks are not required to be aligned according to it in +all cases. Expected size, when unknown, is set to @code{(const_int -1)}. + Descriptions of multiple @code{movmem@var{m}} patterns can only be beneficial if the patterns for smaller modes have fewer restrictions on their first, second and fourth operands. Note that the mode @var{m} @@ -4003,6 +4008,11 @@ of a @code{const_int} rtx. Thus, if the compiler knows that the destination is word-aligned, it may provide the value 4 for this operand. +Optional operands 5 and 6 specify expected alignment and size of block +respectively. The expected alignment differs from alignment in operand 4 +in a way that the blocks are not required to be aligned according to it in +all cases. Expected size, when unknown, is set to @code{(const_int -1)}. + The use for multiple @code{setmem@var{m}} is as for @code{movmem@var{m}}. @cindex @code{cmpstrn@var{m}} instruction pattern |