From e0bd6c9f0aa67d88bbb20019362a4572fc5fac3c Mon Sep 17 00:00:00 2001 From: Richard Sandiford Date: Tue, 12 Sep 2017 13:27:55 +0000 Subject: Turn SLOW_UNALIGNED_ACCESS into a target hook 2017-09-12 Richard Sandiford Alan Hayward David Sherwood gcc/ * defaults.h (SLOW_UNALIGNED_ACCESS): Delete. * target.def (slow_unaligned_access): New hook. * targhooks.h (default_slow_unaligned_access): Declare. * targhooks.c (default_slow_unaligned_access): New function. * doc/tm.texi.in (SLOW_UNALIGNED_ACCESS): Replace with... (TARGET_SLOW_UNALIGNED_ACCESS): ...this. * doc/tm.texi: Regenerate. * config/alpha/alpha.h (SLOW_UNALIGNED_ACCESS): Delete. * config/arm/arm.h (SLOW_UNALIGNED_ACCESS): Delete. * config/i386/i386.h (SLOW_UNALIGNED_ACCESS): Delete commented-out definition. * config/powerpcspe/powerpcspe.h (SLOW_UNALIGNED_ACCESS): Delete. * config/powerpcspe/powerpcspe.c (TARGET_SLOW_UNALIGNED_ACCESS): Redefine. (rs6000_slow_unaligned_access): New function. (rs6000_emit_move): Use it instead of SLOW_UNALIGNED_ACCESS. (expand_block_compare): Likewise. (expand_strn_compare): Likewise. (rs6000_rtx_costs): Likewise. * config/riscv/riscv.h (SLOW_UNALIGNED_ACCESS): Delete. (riscv_slow_unaligned_access): Likewise. * config/riscv/riscv.c (riscv_slow_unaligned_access): Rename to... (riscv_slow_unaligned_access_p): ...this and make static. (riscv_option_override): Update accordingly. (riscv_slow_unaligned_access): New function. (TARGET_SLOW_UNALIGNED_ACCESS): Redefine. * config/rs6000/rs6000.h (SLOW_UNALIGNED_ACCESS): Delete. * config/rs6000/rs6000.c (TARGET_SLOW_UNALIGNED_ACCESS): Redefine. (rs6000_slow_unaligned_access): New function. (rs6000_emit_move): Use it instead of SLOW_UNALIGNED_ACCESS. (rs6000_rtx_costs): Likewise. * config/rs6000/rs6000-string.c (expand_block_compare) (expand_strn_compare): Use targetm.slow_unaligned_access instead of SLOW_UNALIGNED_ACCESS. * config/tilegx/tilegx.h (SLOW_UNALIGNED_ACCESS): Delete. * config/tilepro/tilepro.h (SLOW_UNALIGNED_ACCESS): Delete. * calls.c (expand_call): Use targetm.slow_unaligned_access instead of SLOW_UNALIGNED_ACCESS. * expmed.c (simple_mem_bitfield_p): Likewise. * expr.c (alignment_for_piecewise_move): Likewise. (emit_group_load_1): Likewise. (emit_group_store): Likewise. (copy_blkmode_from_reg): Likewise. (emit_push_insn): Likewise. (expand_assignment): Likewise. (store_field): Likewise. (expand_expr_real_1): Likewise. * gimple-fold.c (gimple_fold_builtin_memory_op): Likewise. * lra-constraints.c (simplify_operand_subreg): Likewise. * stor-layout.c (bit_field_mode_iterator::next_mode): Likewise. * gimple-ssa-store-merging.c: Likewise in block comment at start of file. * tree-ssa-strlen.c: Include target.h. (handle_builtin_memcmp): Use targetm.slow_unaligned_access instead of SLOW_UNALIGNED_ACCESS. * system.h (SLOW_UNALIGNED_ACCESS): Poison. Co-Authored-By: Alan Hayward Co-Authored-By: David Sherwood From-SVN: r252009 --- gcc/target.def | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'gcc/target.def') 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\ -- cgit v1.1