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Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/md.texi | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi index 3c11d19..864824f 100644 --- a/gcc/doc/md.texi +++ b/gcc/doc/md.texi @@ -4424,6 +4424,20 @@ The syntax and semantics are otherwise identical to @code{define_constraint}. @end deffn +@deffn {MD Expression} define_special_memory_constraint name docstring exp +Use this expression for constraints that match a subset of all memory +operands: that is, @code{reload} can not make them match by reloading +the address as it is described for @code{define_memory_constraint} or +such address reload is undesirable with the performance point of view. + +For example, @code{define_special_memory_constraint} can be useful if +specifically aligned memory is necessary or desirable for some insn +operand. + +The syntax and semantics are otherwise identical to +@code{define_constraint}. +@end deffn + @deffn {MD Expression} define_address_constraint name docstring exp Use this expression for constraints that match a subset of all address operands: that is, @code{reload} can make the constraint match by |