diff options
Diffstat (limited to 'gcc/target.def')
| -rw-r--r-- | gcc/target.def | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/gcc/target.def b/gcc/target.def index 110300c..0327650 100644 --- a/gcc/target.def +++ b/gcc/target.def @@ -3512,6 +3512,25 @@ negative number from this hook.", default_compare_by_pieces_branch_ratio) DEFHOOK +(slow_unaligned_access, + "This hook returns true if memory accesses described by the\n\ +@var{mode} and @var{alignment} parameters have a cost many times greater\n\ +than aligned accesses, for example if they are emulated in a trap handler.\n\ +This hook is invoked only for unaligned accesses, i.e. when\n\ +@code{@var{alignment} < GET_MODE_ALIGNMENT (@var{mode})}.\n\ +\n\ +When this hook returns true, the compiler will act as if\n\ +@code{STRICT_ALIGNMENT} were true when generating code for block\n\ +moves. This can cause significantly more instructions to be produced.\n\ +Therefore, do not make this hook return true if unaligned accesses only\n\ +add a cycle or two to the time for a memory access.\n\ +\n\ +The hook must return true whenever @code{STRICT_ALIGNMENT} is true.\n\ +The default implementation returns @code{STRICT_ALIGNMENT}.", + bool, (machine_mode mode, unsigned int align), + default_slow_unaligned_access) + +DEFHOOK (optab_supported_p, "Return true if the optimizers should use optab @var{op} with\n\ modes @var{mode1} and @var{mode2} for optimization type @var{opt_type}.\n\ |