re PR target/11787 (always call memcpy for block move in mips16)
2007-08-24 Sandra Loosemore <sandra@codesourcery.com>
Nigel Stephens <nigel@mips.com>
PR target/11787
gcc/
* doc/tm.texi (SET_RATIO, SET_BY_PIECES_P): Document new macros.
(STORE_BY_PIECES_P): No longer applies to __builtin_memset.
* expr.c (SET_BY_PIECES_P): Define.
(can_store_by_pieces, store_by_pieces): Add MEMSETP argument; use
it to decide whether to use SET_BY_PIECES_P or STORE_BY_PIECES_P.
(store_expr): Pass MEMSETP argument to can_store_by_pieces and
store_by_pieces.
* expr.h (SET_RATIO): Define.
(can_store_by_pieces, store_by_pieces): Update prototypes.
* builtins.c (expand_builtin_memcpy): Pass MEMSETP argument to
can_store_by_pieces/store_by_pieces.
(expand_builtin_memcpy_args): Likewise.
(expand_builtin_strncpy): Likewise.
(expand_builtin_memset_args): Likewise. Also remove special case
for optimize_size so that can_store_by_pieces/SET_BY_PIECES_P can
decide what to do instead.
* value-prof.c (tree_stringops_transform): Pass MEMSETP argument
to can_store_by_pieces.
* config/sh/sh.h (SET_BY_PIECES_P): Clone from STORE_BY_PIECES_P.
* config/s390/s390.h (SET_BY_PIECES_P): Likewise.
* config/mips/mips.opt (mmemcpy): Change from Var to Mask.
* config/mips/mips.c (override_options): Make -Os default to -mmemcpy.
* config/mips/mips.h (MIPS_CALL_RATIO): Define.
(MOVE_RATIO, CLEAR_RATIO, SET_RATIO): Define.
(STORE_BY_PIECES_P): Define.
Co-Authored-By: Nigel Stephens <nigel@mips.com>
From-SVN: r127790
This commit is contained in:
Sandra Loosemore
Sandra Loosemore
parent
f9837879d5
commit
cfa311506c
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@ -1,3 +1,36 @@
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2007-08-24 Sandra Loosemore <sandra@codesourcery.com>
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Nigel Stephens <nigel@mips.com>
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PR target/11787
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* doc/tm.texi (SET_RATIO, SET_BY_PIECES_P): Document new macros.
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(STORE_BY_PIECES_P): No longer applies to __builtin_memset.
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* expr.c (SET_BY_PIECES_P): Define.
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(can_store_by_pieces, store_by_pieces): Add MEMSETP argument; use
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it to decide whether to use SET_BY_PIECES_P or STORE_BY_PIECES_P.
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(store_expr): Pass MEMSETP argument to can_store_by_pieces and
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store_by_pieces.
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* expr.h (SET_RATIO): Define.
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(can_store_by_pieces, store_by_pieces): Update prototypes.
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* builtins.c (expand_builtin_memcpy): Pass MEMSETP argument to
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can_store_by_pieces/store_by_pieces.
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(expand_builtin_memcpy_args): Likewise.
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(expand_builtin_strncpy): Likewise.
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(expand_builtin_memset_args): Likewise. Also remove special case
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for optimize_size so that can_store_by_pieces/SET_BY_PIECES_P can
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decide what to do instead.
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* value-prof.c (tree_stringops_transform): Pass MEMSETP argument
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to can_store_by_pieces.
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* config/sh/sh.h (SET_BY_PIECES_P): Clone from STORE_BY_PIECES_P.
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* config/s390/s390.h (SET_BY_PIECES_P): Likewise.
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* config/mips/mips.opt (mmemcpy): Change from Var to Mask.
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* config/mips/mips.c (override_options): Make -Os default to -mmemcpy.
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* config/mips/mips.h (MIPS_CALL_RATIO): Define.
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(MOVE_RATIO, CLEAR_RATIO, SET_RATIO): Define.
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(STORE_BY_PIECES_P): Define.
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2007-08-24 Tom Tromey <tromey@redhat.com>
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* varpool.c (varpool_last_needed_node): Fix comment typo.
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@ -3331,11 +3331,11 @@ expand_builtin_memcpy (tree exp, rtx target, enum machine_mode mode)
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&& GET_CODE (len_rtx) == CONST_INT
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&& (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= strlen (src_str) + 1
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&& can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
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(void *) src_str, dest_align))
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(void *) src_str, dest_align, false))
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{
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dest_mem = store_by_pieces (dest_mem, INTVAL (len_rtx),
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builtin_memcpy_read_str,
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(void *) src_str, dest_align, 0);
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(void *) src_str, dest_align, false, 0);
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dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
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dest_mem = convert_memory_address (ptr_mode, dest_mem);
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return dest_mem;
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@ -3444,13 +3444,14 @@ expand_builtin_mempcpy_args (tree dest, tree src, tree len, tree type,
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&& GET_CODE (len_rtx) == CONST_INT
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&& (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= strlen (src_str) + 1
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&& can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
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(void *) src_str, dest_align))
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(void *) src_str, dest_align, false))
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{
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dest_mem = get_memory_rtx (dest, len);
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set_mem_align (dest_mem, dest_align);
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dest_mem = store_by_pieces (dest_mem, INTVAL (len_rtx),
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builtin_memcpy_read_str,
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(void *) src_str, dest_align, endp);
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(void *) src_str, dest_align,
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false, endp);
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dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
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dest_mem = convert_memory_address (ptr_mode, dest_mem);
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return dest_mem;
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@ -3792,13 +3793,13 @@ expand_builtin_strncpy (tree exp, rtx target, enum machine_mode mode)
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if (!p || dest_align == 0 || !host_integerp (len, 1)
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|| !can_store_by_pieces (tree_low_cst (len, 1),
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builtin_strncpy_read_str,
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(void *) p, dest_align))
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(void *) p, dest_align, false))
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return NULL_RTX;
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dest_mem = get_memory_rtx (dest, len);
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store_by_pieces (dest_mem, tree_low_cst (len, 1),
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builtin_strncpy_read_str,
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(void *) p, dest_align, 0);
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(void *) p, dest_align, false, 0);
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dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
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dest_mem = convert_memory_address (ptr_mode, dest_mem);
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return dest_mem;
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@ -3926,14 +3927,15 @@ expand_builtin_memset_args (tree dest, tree val, tree len,
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* We can't pass builtin_memset_gen_str as that emits RTL. */
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c = 1;
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if (host_integerp (len, 1)
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&& !(optimize_size && tree_low_cst (len, 1) > 1)
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&& can_store_by_pieces (tree_low_cst (len, 1),
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builtin_memset_read_str, &c, dest_align))
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builtin_memset_read_str, &c, dest_align,
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true))
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{
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val_rtx = force_reg (TYPE_MODE (unsigned_char_type_node),
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val_rtx);
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store_by_pieces (dest_mem, tree_low_cst (len, 1),
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builtin_memset_gen_str, val_rtx, dest_align, 0);
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builtin_memset_gen_str, val_rtx, dest_align,
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true, 0);
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}
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else if (!set_storage_via_setmem (dest_mem, len_rtx, val_rtx,
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dest_align, expected_align,
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@ -3951,11 +3953,11 @@ expand_builtin_memset_args (tree dest, tree val, tree len,
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if (c)
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{
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if (host_integerp (len, 1)
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&& !(optimize_size && tree_low_cst (len, 1) > 1)
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&& can_store_by_pieces (tree_low_cst (len, 1),
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builtin_memset_read_str, &c, dest_align))
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builtin_memset_read_str, &c, dest_align,
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true))
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store_by_pieces (dest_mem, tree_low_cst (len, 1),
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builtin_memset_read_str, &c, dest_align, 0);
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builtin_memset_read_str, &c, dest_align, true, 0);
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else if (!set_storage_via_setmem (dest_mem, len_rtx, GEN_INT (c),
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dest_align, expected_align,
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expected_size))
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@ -5323,6 +5323,11 @@ override_options (void)
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flag_delayed_branch = 0;
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}
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/* Prefer a call to memcpy over inline code when optimizing for size,
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though see MOVE_RATIO in mips.h. */
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if (optimize_size && (target_flags_explicit & MASK_MEMCPY) == 0)
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target_flags |= MASK_MEMCPY;
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#ifdef MIPS_TFMODE_FORMAT
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REAL_MODE_FORMAT (TFmode) = &MIPS_TFMODE_FORMAT;
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#endif
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@ -2785,6 +2785,57 @@ while (0)
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#undef PTRDIFF_TYPE
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#define PTRDIFF_TYPE (POINTER_SIZE == 64 ? "long int" : "int")
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/* The base cost of a memcpy call, for MOVE_RATIO and friends. These
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values were determined experimentally by benchmarking with CSiBE.
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In theory, the call overhead is higher for TARGET_ABICALLS (especially
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for o32 where we have to restore $gp afterwards as well as make an
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indirect call), but in practice, bumping this up higher for
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TARGET_ABICALLS doesn't make much difference to code size. */
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#define MIPS_CALL_RATIO 8
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/* Define MOVE_RATIO to encourage use of movmemsi when enabled,
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since it should always generate code at least as good as
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move_by_pieces(). But when inline movmemsi pattern is disabled
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(i.e., with -mips16 or -mmemcpy), instead use a value approximating
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the length of a memcpy call sequence, so that move_by_pieces will
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generate inline code if it is shorter than a function call.
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Since move_by_pieces_ninsns() counts memory-to-memory moves, but
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we'll have to generate a load/store pair for each, halve the value of
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MIPS_CALL_RATIO to take that into account.
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The default value for MOVE_RATIO when HAVE_movmemsi is true is 2.
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There is no point to setting it to less than this to try to disable
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move_by_pieces entirely, because that also disables some desirable
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tree-level optimizations, specifically related to optimizing a
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one-byte string copy into a simple move byte operation. */
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#define MOVE_RATIO \
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((TARGET_MIPS16 || TARGET_MEMCPY) ? MIPS_CALL_RATIO / 2 : 2)
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/* For CLEAR_RATIO, when optimizing for size, give a better estimate
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of the length of a memset call, but use the default otherwise. */
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#define CLEAR_RATIO \
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(optimize_size ? MIPS_CALL_RATIO : 15)
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/* This is similar to CLEAR_RATIO, but for a non-zero constant, so when
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optimizing for size adjust the ratio to account for the overhead of
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loading the constant and replicating it across the word. */
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#define SET_RATIO \
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(optimize_size ? MIPS_CALL_RATIO - 2 : 15)
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/* STORE_BY_PIECES_P can be used when copying a constant string, but
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in that case each word takes 3 insns (lui, ori, sw), or more in
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64-bit mode, instead of 2 (lw, sw). For now we always fail this
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and let the move_by_pieces code copy the string from read-only
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memory. In the future, this could be tuned further for multi-issue
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CPUs that can issue stores down one pipe and arithmetic instructions
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down another; in that case, the lui/ori/sw combination would be a
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win for long enough strings. */
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#define STORE_BY_PIECES_P(SIZE, ALIGN) 0
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#ifndef __mips16
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/* Since the bits of the _init and _fini function is spread across
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@ -173,7 +173,7 @@ Target Report RejectNegative Mask(LONG64)
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Use a 64-bit long type
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mmemcpy
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Target Report Var(TARGET_MEMCPY)
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Target Report Mask(MEMCPY)
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Don't optimize block moves
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mmips-tfile
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@ -803,10 +803,13 @@ extern struct rtx_def *s390_compare_op0, *s390_compare_op1, *s390_compare_emitte
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|| (TARGET_64BIT && (SIZE) == 8) )
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/* This macro is used to determine whether store_by_pieces should be
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called to "memset" storage with byte values other than zero, or
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to "memcpy" storage when the source is a constant string. */
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called to "memcpy" storage when the source is a constant string. */
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#define STORE_BY_PIECES_P(SIZE, ALIGN) MOVE_BY_PIECES_P (SIZE, ALIGN)
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/* Likewise to decide whether to "memset" storage with byte values
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other than zero. */
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#define SET_BY_PIECES_P(SIZE, ALIGN) STORE_BY_PIECES_P (SIZE, ALIGN)
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/* Don't perform CSE on function addresses. */
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#define NO_FUNCTION_CSE
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@ -2184,6 +2184,8 @@ struct sh_args {
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(move_by_pieces_ninsns (SIZE, ALIGN, STORE_MAX_PIECES + 1) \
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< (TARGET_SMALLCODE ? 2 : ((ALIGN >= 32) ? 16 : 2)))
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#define SET_BY_PIECES_P(SIZE, ALIGN) STORE_BY_PIECES_P(SIZE, ALIGN)
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/* Macros to check register numbers against specific register classes. */
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/* These assume that REGNO is a hard or pseudo reg number.
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@ -5897,12 +5897,30 @@ will be used. Defaults to 1 if @code{move_by_pieces_ninsns} returns less
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than @code{CLEAR_RATIO}.
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@end defmac
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@defmac SET_RATIO
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The threshold of number of scalar move insns, @emph{below} which a sequence
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of insns should be generated to set memory to a constant value, instead of
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a block set insn or a library call.
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Increasing the value will always make code faster, but
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eventually incurs high cost in increased code size.
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If you don't define this, it defaults to the value of @code{MOVE_RATIO}.
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@end defmac
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@defmac SET_BY_PIECES_P (@var{size}, @var{alignment})
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A C expression used to determine whether @code{store_by_pieces} will be
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used to set a chunk of memory to a constant value, or whether some
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other mechanism will be used. Used by @code{__builtin_memset} when
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storing values other than constant zero.
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Defaults to 1 if @code{move_by_pieces_ninsns} returns less
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than @code{SET_RATIO}.
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@end defmac
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@defmac STORE_BY_PIECES_P (@var{size}, @var{alignment})
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A C expression used to determine whether @code{store_by_pieces} will be
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used to set a chunk of memory to a constant value, or whether some other
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mechanism will be used. Used by @code{__builtin_memset} when storing
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values other than constant zero and by @code{__builtin_strcpy} when
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when called with a constant source string.
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used to set a chunk of memory to a constant string value, or whether some
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other mechanism will be used. Used by @code{__builtin_strcpy} when
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called with a constant source string.
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Defaults to 1 if @code{move_by_pieces_ninsns} returns less
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than @code{MOVE_RATIO}.
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@end defmac
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36
gcc/expr.c
36
gcc/expr.c
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@ -186,8 +186,15 @@ static bool float_extend_from_mem[NUM_MACHINE_MODES][NUM_MACHINE_MODES];
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#endif
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/* This macro is used to determine whether store_by_pieces should be
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called to "memset" storage with byte values other than zero, or
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to "memcpy" storage when the source is a constant string. */
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called to "memset" storage with byte values other than zero. */
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#ifndef SET_BY_PIECES_P
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#define SET_BY_PIECES_P(SIZE, ALIGN) \
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(move_by_pieces_ninsns (SIZE, ALIGN, STORE_MAX_PIECES + 1) \
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< (unsigned int) SET_RATIO)
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#endif
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/* This macro is used to determine whether store_by_pieces should be
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called to "memcpy" storage when the source is a constant string. */
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#ifndef STORE_BY_PIECES_P
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#define STORE_BY_PIECES_P(SIZE, ALIGN) \
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(move_by_pieces_ninsns (SIZE, ALIGN, STORE_MAX_PIECES + 1) \
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@ -2191,13 +2198,14 @@ use_group_regs (rtx *call_fusage, rtx regs)
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/* Determine whether the LEN bytes generated by CONSTFUN can be
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stored to memory using several move instructions. CONSTFUNDATA is
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a pointer which will be passed as argument in every CONSTFUN call.
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ALIGN is maximum alignment we can assume. Return nonzero if a
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call to store_by_pieces should succeed. */
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ALIGN is maximum alignment we can assume. MEMSETP is true if this is
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a memset operation and false if it's a copy of a constant string.
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Return nonzero if a call to store_by_pieces should succeed. */
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int
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can_store_by_pieces (unsigned HOST_WIDE_INT len,
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rtx (*constfun) (void *, HOST_WIDE_INT, enum machine_mode),
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void *constfundata, unsigned int align)
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void *constfundata, unsigned int align, bool memsetp)
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{
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unsigned HOST_WIDE_INT l;
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unsigned int max_size;
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@ -2210,7 +2218,9 @@ can_store_by_pieces (unsigned HOST_WIDE_INT len,
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if (len == 0)
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return 1;
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if (! STORE_BY_PIECES_P (len, align))
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if (! (memsetp
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? SET_BY_PIECES_P (len, align)
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: STORE_BY_PIECES_P (len, align)))
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return 0;
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tmode = mode_for_size (STORE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
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@ -2285,7 +2295,8 @@ can_store_by_pieces (unsigned HOST_WIDE_INT len,
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/* Generate several move instructions to store LEN bytes generated by
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CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
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pointer which will be passed as argument in every CONSTFUN call.
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ALIGN is maximum alignment we can assume.
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ALIGN is maximum alignment we can assume. MEMSETP is true if this is
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a memset operation and false if it's a copy of a constant string.
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If ENDP is 0 return to, if ENDP is 1 return memory at the end ala
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mempcpy, and if ENDP is 2 return memory the end minus one byte ala
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stpcpy. */
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@ -2293,7 +2304,7 @@ can_store_by_pieces (unsigned HOST_WIDE_INT len,
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rtx
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store_by_pieces (rtx to, unsigned HOST_WIDE_INT len,
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rtx (*constfun) (void *, HOST_WIDE_INT, enum machine_mode),
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void *constfundata, unsigned int align, int endp)
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void *constfundata, unsigned int align, bool memsetp, int endp)
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{
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struct store_by_pieces data;
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@ -2303,7 +2314,9 @@ store_by_pieces (rtx to, unsigned HOST_WIDE_INT len,
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return to;
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}
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gcc_assert (STORE_BY_PIECES_P (len, align));
|
||||
gcc_assert (memsetp
|
||||
? SET_BY_PIECES_P (len, align)
|
||||
: STORE_BY_PIECES_P (len, align));
|
||||
data.constfun = constfun;
|
||||
data.constfundata = constfundata;
|
||||
data.len = len;
|
||||
|
|
@ -4498,7 +4511,7 @@ store_expr (tree exp, rtx target, int call_param_p, bool nontemporal)
|
|||
str_copy_len = MIN (str_copy_len, exp_len);
|
||||
if (!can_store_by_pieces (str_copy_len, builtin_strncpy_read_str,
|
||||
(void *) TREE_STRING_POINTER (exp),
|
||||
MEM_ALIGN (target)))
|
||||
MEM_ALIGN (target), false))
|
||||
goto normal_expr;
|
||||
|
||||
dest_mem = target;
|
||||
|
|
@ -4507,7 +4520,8 @@ store_expr (tree exp, rtx target, int call_param_p, bool nontemporal)
|
|||
str_copy_len, builtin_strncpy_read_str,
|
||||
(void *) TREE_STRING_POINTER (exp),
|
||||
MEM_ALIGN (target),
|
||||
exp_len > str_copy_len ? 1 : 0);
|
||||
exp_len > str_copy_len ? 1 : 0,
|
||||
false);
|
||||
if (exp_len > str_copy_len)
|
||||
clear_storage (dest_mem, GEN_INT (exp_len - str_copy_len),
|
||||
BLOCK_OP_NORMAL);
|
||||
|
|
|
|||
16
gcc/expr.h
16
gcc/expr.h
|
|
@ -84,6 +84,13 @@ enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM,
|
|||
#define CLEAR_RATIO (optimize_size ? 3 : 15)
|
||||
#endif
|
||||
#endif
|
||||
|
||||
/* If a memory set (to value other than zero) operation would take
|
||||
SET_RATIO or more simple move-instruction sequences, we will do a movmem
|
||||
or libcall instead. */
|
||||
#ifndef SET_RATIO
|
||||
#define SET_RATIO MOVE_RATIO
|
||||
#endif
|
||||
|
||||
enum direction {none, upward, downward};
|
||||
|
||||
|
|
@ -444,20 +451,23 @@ extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);
|
|||
CONSTFUN with several move instructions by store_by_pieces
|
||||
function. CONSTFUNDATA is a pointer which will be passed as argument
|
||||
in every CONSTFUN call.
|
||||
ALIGN is maximum alignment we can assume. */
|
||||
ALIGN is maximum alignment we can assume.
|
||||
MEMSETP is true if this is a real memset/bzero, not a copy
|
||||
of a const string. */
|
||||
extern int can_store_by_pieces (unsigned HOST_WIDE_INT,
|
||||
rtx (*) (void *, HOST_WIDE_INT,
|
||||
enum machine_mode),
|
||||
void *, unsigned int);
|
||||
void *, unsigned int, bool);
|
||||
|
||||
/* Generate several move instructions to store LEN bytes generated by
|
||||
CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
|
||||
pointer which will be passed as argument in every CONSTFUN call.
|
||||
ALIGN is maximum alignment we can assume.
|
||||
MEMSETP is true if this is a real memset/bzero, not a copy.
|
||||
Returns TO + LEN. */
|
||||
extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT,
|
||||
rtx (*) (void *, HOST_WIDE_INT, enum machine_mode),
|
||||
void *, unsigned int, int);
|
||||
void *, unsigned int, bool, int);
|
||||
|
||||
/* Emit insns to set X from Y. */
|
||||
extern rtx emit_move_insn (rtx, rtx);
|
||||
|
|
|
|||
|
|
@ -1392,13 +1392,13 @@ tree_stringops_transform (block_stmt_iterator *bsi)
|
|||
case BUILT_IN_MEMSET:
|
||||
if (!can_store_by_pieces (val, builtin_memset_read_str,
|
||||
CALL_EXPR_ARG (call, 1),
|
||||
dest_align))
|
||||
dest_align, true))
|
||||
return false;
|
||||
break;
|
||||
case BUILT_IN_BZERO:
|
||||
if (!can_store_by_pieces (val, builtin_memset_read_str,
|
||||
integer_zero_node,
|
||||
dest_align))
|
||||
dest_align, true))
|
||||
return false;
|
||||
break;
|
||||
default:
|
||||
|
|
|
|||
Loading…
Reference in New Issue