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| author | Richard Sandiford <richard.sandiford@linaro.org> | 2017-09-12 13:27:55 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2017-09-12 13:27:55 +0000 |
| commit | e0bd6c9f0aa67d88bbb20019362a4572fc5fac3c (patch) | |
| tree | 3ca0e90f453bcc3361eb758707d8da86a656477f /gcc/target.def | |
| parent | 41defab318e4b5d8b87ba2b3512b02cb49c748a9 (diff) | |
| download | gcc-e0bd6c9f0aa67d88bbb20019362a4572fc5fac3c.zip gcc-e0bd6c9f0aa67d88bbb20019362a4572fc5fac3c.tar.gz gcc-e0bd6c9f0aa67d88bbb20019362a4572fc5fac3c.tar.bz2 | |
Turn SLOW_UNALIGNED_ACCESS into a target hook
2017-09-12 Richard Sandiford <richard.sandiford@linaro.org>
Alan Hayward <alan.hayward@arm.com>
David Sherwood <david.sherwood@arm.com>
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 <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>
From-SVN: r252009
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\ |