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Mon, 29 Jul 2024 12:14:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1722255280; h=from:from:reply-to:date:date:to:to:cc:cc:mime-version:mime-version: content-type:content-type; bh=F+8ohxzB8nA+UF4CdNKSLjBmbjnZLibzqEjfx8tWje4=; b=KAKKPhYquOeEslpc+geyFXJQweyKWiivNj9sxWWTaWynWmsVxcmohjF+N48EdHs8eKRLro vHYTNUXZMhhGmoWxQTQVikSDjJzGfYzdgsHnX2UnvE5VwjCi3Jn3SLwnr1ZOBWqmQDZmnH SXtZ1aTDjkS3XCsTVWTNr0VbZZ/hPEk= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1722255280; h=from:from:reply-to:date:date:to:to:cc:cc:mime-version:mime-version: content-type:content-type; bh=F+8ohxzB8nA+UF4CdNKSLjBmbjnZLibzqEjfx8tWje4=; b=ay4iQulSF2pSfuXwXt5V41AWt6XZL5cJn4J+H1QY98rc0FZYFC8wRqLMm8RmRP9jvX0BEc z1PhSFLMep2ylgBQ== Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1722255280; h=from:from:reply-to:date:date:to:to:cc:cc:mime-version:mime-version: content-type:content-type; bh=F+8ohxzB8nA+UF4CdNKSLjBmbjnZLibzqEjfx8tWje4=; b=KAKKPhYquOeEslpc+geyFXJQweyKWiivNj9sxWWTaWynWmsVxcmohjF+N48EdHs8eKRLro vHYTNUXZMhhGmoWxQTQVikSDjJzGfYzdgsHnX2UnvE5VwjCi3Jn3SLwnr1ZOBWqmQDZmnH SXtZ1aTDjkS3XCsTVWTNr0VbZZ/hPEk= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1722255280; h=from:from:reply-to:date:date:to:to:cc:cc:mime-version:mime-version: content-type:content-type; bh=F+8ohxzB8nA+UF4CdNKSLjBmbjnZLibzqEjfx8tWje4=; b=ay4iQulSF2pSfuXwXt5V41AWt6XZL5cJn4J+H1QY98rc0FZYFC8wRqLMm8RmRP9jvX0BEc z1PhSFLMep2ylgBQ== Date: Mon, 29 Jul 2024 14:14:40 +0200 (CEST) From: Richard Biener To: gcc-patches@gcc.gnu.org cc: Jakub Jelinek Subject: [PATCH 1/3] Add TARGET_MODE_CAN_TRANSFER_BITS MIME-Version: 1.0 X-Spamd-Result: default: False [-1.58 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MISSING_MID(2.50)[]; NEURAL_HAM_LONG(-0.98)[-0.982]; MIME_GOOD(-0.10)[text/plain]; MISSING_XM_UA(0.00)[]; RCVD_COUNT_ZERO(0.00)[0]; ARC_NA(0.00)[]; RCPT_COUNT_TWO(0.00)[2]; FROM_HAS_DN(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; TO_DN_SOME(0.00)[] X-Spam-Level: X-Spam-Score: -1.58 X-Spam-Status: No, score=-10.5 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, MISSING_MID, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org Message-Id: <20240729121602.3856F3858433@sourceware.org> The following adds a target hook to specify whether regs of MODE can be used to transfer bits. The hook is supposed to be used for value-numbering to decide whether a value loaded in such mode can be punned to another mode instead of re-loading the value in the other mode and for SRA to decide whether MODE is suitable as container holding a value to be used in different modes. * target.def (mode_can_transfer_bits): New target hook. * target.h (mode_can_transfer_bits): New function wrapping the hook and providing default behavior. * doc/tm.texi.in: Update. * doc/tm.texi: Re-generate. --- gcc/doc/tm.texi | 6 ++++++ gcc/doc/tm.texi.in | 2 ++ gcc/target.def | 8 ++++++++ gcc/target.h | 15 +++++++++++++++ 4 files changed, 31 insertions(+) diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index c7535d07f4d..fa53c23f1de 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -4545,6 +4545,12 @@ is either a declaration of type int or accessed by dereferencing a pointer to int. @end deftypefn +@deftypefn {Target Hook} bool TARGET_MODE_CAN_TRANSFER_BITS (machine_mode @var{mode}) +Define this to return false if the mode @var{mode} cannot be used +for memory copying. The default is to assume modes with the same +precision as size are fine to be used. +@end deftypefn + @deftypefn {Target Hook} machine_mode TARGET_TRANSLATE_MODE_ATTRIBUTE (machine_mode @var{mode}) Define this hook if during mode attribute processing, the port should translate machine_mode @var{mode} to another mode. For example, rs6000's diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in index 64cea3b1eda..8af3f414505 100644 --- a/gcc/doc/tm.texi.in +++ b/gcc/doc/tm.texi.in @@ -3455,6 +3455,8 @@ stack. @hook TARGET_REF_MAY_ALIAS_ERRNO +@hook TARGET_MODE_CAN_TRANSFER_BITS + @hook TARGET_TRANSLATE_MODE_ATTRIBUTE @hook TARGET_SCALAR_MODE_SUPPORTED_P diff --git a/gcc/target.def b/gcc/target.def index 3de1aad4c84..4356ef2f974 100644 --- a/gcc/target.def +++ b/gcc/target.def @@ -3363,6 +3363,14 @@ a pointer to int.", bool, (ao_ref *ref), default_ref_may_alias_errno) +DEFHOOK +(mode_can_transfer_bits, + "Define this to return false if the mode @var{mode} cannot be used\n\ +for memory copying. The default is to assume modes with the same\n\ +precision as size are fine to be used.", + bool, (machine_mode mode), + NULL) + /* Support for named address spaces. */ #undef HOOK_PREFIX #define HOOK_PREFIX "TARGET_ADDR_SPACE_" diff --git a/gcc/target.h b/gcc/target.h index c1f99b97b86..c888ad39897 100644 --- a/gcc/target.h +++ b/gcc/target.h @@ -312,6 +312,21 @@ estimated_poly_value (poly_int64 x, return targetm.estimated_poly_value (x, kind); } +/* Return true when MODE can be used to copy GET_MODE_BITSIZE bits + unchanged. */ + +inline bool +mode_can_transfer_bits (machine_mode mode) +{ + if (mode == BLKmode) + return true; + if (maybe_ne (GET_MODE_BITSIZE (mode), GET_MODE_PRECISION (mode))) + return false; + if (targetm.mode_can_transfer_bits) + return targetm.mode_can_transfer_bits (mode); + return true; +} + #ifdef GCC_TM_H #ifndef CUMULATIVE_ARGS_MAGIC